/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.harmony.prefs.tests.java.util.prefs;

import dalvik.annotation.TestLevel;
import dalvik.annotation.TestTargetClass;
import dalvik.annotation.TestTargetNew;
import dalvik.annotation.TestTargets;
import junit.framework.TestCase;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.util.Arrays;
import java.util.prefs.AbstractPreferences;
import java.util.prefs.BackingStoreException;
import java.util.prefs.InvalidPreferencesFormatException;
import java.util.prefs.NodeChangeListener;
import java.util.prefs.PreferenceChangeListener;
import java.util.prefs.Preferences;

/**
 *
 */
@TestTargetClass(Preferences.class)
public class PreferencesTest extends TestCase {

    MockInputStream stream = null;

    final static String longKey;

    final static String longValue;

    InputStream in;
    static {
        StringBuffer key = new StringBuffer(Preferences.MAX_KEY_LENGTH);
        for (int i = 0; i < Preferences.MAX_KEY_LENGTH; i++) {
            key.append('a');
        }
        longKey = key.toString();

        StringBuffer value = new StringBuffer(Preferences.MAX_VALUE_LENGTH);
        for (int i = 0; i < Preferences.MAX_VALUE_LENGTH; i++) {
            value.append('a');
        }
        longValue = value.toString();
    }

    /*
     * @see TestCase#setUp()
     */
    @Override
    protected void setUp() throws Exception {
        super.setUp();
        in = new ByteArrayInputStream(
                "<!DOCTYPE preferences SYSTEM \"http://java.sun.com/dtd/preferences.dtd\"><preferences><root type=\"user\"><map></map></root></preferences>"
                        .getBytes("UTF-8"));
        stream = new MockInputStream(in);
    }

    /*
     * @see TestCase#tearDown()
     */
    @Override
    protected void tearDown() throws Exception {
        stream.close();
        super.tearDown();
    }

    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "systemNodeForPackage",
        args = {java.lang.Class.class}
    )
    public void testSystemNodeForPackage() {
        Preferences p = null;
        try {
            p = Preferences.systemNodeForPackage(Object.class);
        } catch (SecurityException e) {
            // may be caused by absence of privileges on the underlying OS
            return;
        }
        assertEquals("/java/lang", p.absolutePath());
        assertTrue(p instanceof AbstractPreferences);
        Preferences root = Preferences.systemRoot();
        Preferences parent = root.node("java");
        assertSame(parent, p.parent());
        assertFalse(p.isUserNode());
        assertEquals("lang", p.name());
        assertEquals("System Preference Node: " + p.absolutePath(), p
                .toString());
        try {
            assertEquals(0, p.childrenNames().length);
        } catch (BackingStoreException e) {
            // could be thrown according to specification
        }
        try {
            assertEquals(0, p.keys().length);
        } catch (BackingStoreException e) {
            // could be thrown according to specification
        }

        try {
            p = Preferences.systemNodeForPackage(null);
            fail("NullPointerException has not been thrown");
        } catch (NullPointerException e) {
            // expected
        }
    }

    @TestTargetNew(
        level = TestLevel.PARTIAL_COMPLETE,
        notes = "SecurityException checking missed.",
        method = "systemRoot",
        args = {}
    )
    public void testSystemRoot() {
        Preferences p = Preferences.systemRoot();
        assertTrue(p instanceof AbstractPreferences);
        assertEquals("/", p.absolutePath());
        assertSame(null, p.parent());
        assertFalse(p.isUserNode());
        assertEquals("", p.name());
        assertEquals("System Preference Node: " + p.absolutePath(), p
                .toString());
        // assertEquals(0, p.childrenNames().length);
        // assertEquals(0, p.keys().length);
    }

    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "Checks constant values",
        method = "!Constants",
        args = {}
    )
    public void testConsts() {
        assertEquals(80, Preferences.MAX_KEY_LENGTH);
        assertEquals(80, Preferences.MAX_NAME_LENGTH);
        assertEquals(8192, Preferences.MAX_VALUE_LENGTH);
    }

    @TestTargetNew(
        level = TestLevel.PARTIAL_COMPLETE,
        notes = "SecurityException checking missed.",
        method = "userNodeForPackage",
        args = {java.lang.Class.class}
    )
    public void testUserNodeForPackage() throws BackingStoreException {
        Preferences p = Preferences.userNodeForPackage(Object.class);
        assertEquals("/java/lang", p.absolutePath());
        assertTrue(p instanceof AbstractPreferences);
        Preferences root = Preferences.userRoot();
        Preferences parent = root.node("java");
        assertSame(parent, p.parent());
        assertTrue(p.isUserNode());
        assertEquals("lang", p.name());
        assertEquals("User Preference Node: " + p.absolutePath(), p.toString());
        assertEquals(0, p.childrenNames().length);
        assertEquals(0, p.keys().length);

        try {
            p = Preferences.userNodeForPackage(null);
            fail();
        } catch (NullPointerException e) {
        }
    }

    @TestTargetNew(
        level = TestLevel.PARTIAL_COMPLETE,
        notes = "SecurityException checking missed.",
        method = "userRoot",
        args = {}
    )
    public void testUserRoot() {
        Preferences p = Preferences.userRoot();
        assertTrue(p instanceof AbstractPreferences);
        assertEquals("/", p.absolutePath());
        assertSame(null, p.parent());
        assertTrue(p.isUserNode());
        assertEquals("", p.name());
        assertEquals("User Preference Node: " + p.absolutePath(), p.toString());
        // assertEquals(0, p.childrenNames().length);
        // assertEquals(p.keys().length, 0);
    }


    @TestTargetNew(
            level = TestLevel.PARTIAL_COMPLETE,
            notes = "SecurityException & IOException checking missed.",
            method = "importPreferences",
            args = {java.io.InputStream.class}
        )
    public void testImportPreferences2() throws Exception {
        InputStream in = PreferencesTest.class
                .getResourceAsStream("/prefs/java/util/prefs/userprefs-badtype.xml");
        try {
            Preferences.importPreferences(in);
            fail();
        } catch (InvalidPreferencesFormatException e) {
        }

        in = PreferencesTest.class
                .getResourceAsStream("/prefs/java/util/prefs/userprefs-badencoding.xml");
        try {
            Preferences.importPreferences(in);
            fail();
        } catch (InvalidPreferencesFormatException e) {
        } catch (UnsupportedEncodingException e) {
        }

    }
    @TestTargetNew(
        level = TestLevel.PARTIAL_COMPLETE,
        notes = "SecurityException & IOException checking missed.",
        method = "importPreferences",
        args = {java.io.InputStream.class}
    )
    public void testImportPreferences() throws Exception {
        Preferences prefs = null;
        try {
            prefs = Preferences.userNodeForPackage(PreferencesTest.class);
            // assertEquals(0, prefs.childrenNames().length);
            // assertFalse(prefs.nodeExists("mock/child/grandson"));

            prefs.put("prefskey", "oldvalue");
            prefs.put("prefskey2", "oldvalue2");
            in = getClass().getResourceAsStream("/prefs/java/util/prefs/userprefs.xml");
            Preferences.importPreferences(in);

            prefs = Preferences.userNodeForPackage(PreferencesTest.class);
            assertEquals(1, prefs.childrenNames().length);
            assertTrue(prefs.nodeExists("mock/child/grandson"));
            assertEquals("newvalue", prefs.get("prefskey", null));
            assertEquals("oldvalue2", prefs.get("prefskey2", null));
            assertEquals("newvalue3", prefs.get("prefskey3", null));

            in = PreferencesTest.class
                    .getResourceAsStream("/prefs/java/util/prefs/userprefs-badform.xml");
            try {
                Preferences.importPreferences(in);
                fail();
            } catch (InvalidPreferencesFormatException e) {
            }

            in = PreferencesTest.class
                    .getResourceAsStream("/prefs/java/util/prefs/userprefs-higherversion.xml");
            try {
                Preferences.importPreferences(in);
                fail();
            } catch (InvalidPreferencesFormatException e) {
            }

            in = PreferencesTest.class
                    .getResourceAsStream("/prefs/java/util/prefs/userprefs-ascii.xml");
            Preferences.importPreferences(in);
            prefs = Preferences.userNodeForPackage(PreferencesTest.class);
        } finally {
            try {
                prefs = Preferences.userRoot().node("tests");
                prefs.removeNode();
            } catch (Exception e) {
            }
        }
    }

    @TestTargetNew(
        level = TestLevel.PARTIAL_COMPLETE,
        notes = "Test for Exceptions only.",
        method = "importPreferences",
        args = {java.io.InputStream.class}
    )
    public void testImportPreferencesException() throws Exception {
        try {
            Preferences.importPreferences(null);
            fail();
        } catch (MalformedURLException e) {
        }

        byte[] source = new byte[0];
        InputStream in = new ByteArrayInputStream(source);
        try {
            Preferences.importPreferences(in);
            fail();
        } catch (InvalidPreferencesFormatException e) {
        }

        stream.setResult(MockInputStream.exception);
        try {
            Preferences.importPreferences(stream);
            fail();
        } catch (IOException e) {
        }

        stream.setResult(MockInputStream.runtimeException);
        try {
            Preferences.importPreferences(stream);
            fail();
        } catch (RuntimeException e) {
        }
    }

    @TestTargets({
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "absolutePath",
            args = {}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "childrenNames",
            args = {}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "clear",
            args = {}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "exportNode",
            args = {java.io.OutputStream.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "exportSubtree",
            args = {java.io.OutputStream.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "flush",
            args = {}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "get",
            args = {java.lang.String.class, java.lang.String.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "getBoolean",
            args = {java.lang.String.class, boolean.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "getByteArray",
            args = {java.lang.String.class, byte[].class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "getFloat",
            args = {java.lang.String.class, float.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "getDouble",
            args = {java.lang.String.class, double.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "getInt",
            args = {java.lang.String.class, int.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "getLong",
            args = {java.lang.String.class, long.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "isUserNode",
            args = {}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "keys",
            args = {}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "name",
            args = {}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "node",
            args = {java.lang.String.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "nodeExists",
            args = {java.lang.String.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "parent",
            args = {}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "put",
            args = {java.lang.String.class, java.lang.String.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "putBoolean",
            args = {java.lang.String.class, boolean.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "putByteArray",
            args = {java.lang.String.class, byte[].class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "putDouble",
            args = {java.lang.String.class, double.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "putFloat",
            args = {java.lang.String.class, float.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "putInt",
            args = {java.lang.String.class, int.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "putLong",
            args = {java.lang.String.class, long.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "remove",
            args = {java.lang.String.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "removeNode",
            args = {}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "addNodeChangeListener",
            args = {java.util.prefs.NodeChangeListener.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "addPreferenceChangeListener",
            args = {java.util.prefs.PreferenceChangeListener.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "removeNodeChangeListener",
            args = {java.util.prefs.NodeChangeListener.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "removePreferenceChangeListener",
            args = {java.util.prefs.PreferenceChangeListener.class}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "sync",
            args = {}
        ),
        @TestTargetNew(
            level = TestLevel.COMPLETE,
            notes = "Test for abstract methods.",
            method = "toString",
            args = {}
        )
    })
    public void testAbstractMethods() {
        Preferences p = new MockPreferences();
        p.absolutePath();
        try {
            p.childrenNames();
        } catch (BackingStoreException e4) {
        }
        try {
            p.clear();
        } catch (BackingStoreException e5) {
        }
        try {
            p.exportNode(null);
        } catch (IOException e6) {
        } catch (BackingStoreException e6) {
        }
        try {
            p.exportSubtree(null);
        } catch (IOException e7) {
        } catch (BackingStoreException e7) {
        }
        try {
            p.flush();
        } catch (BackingStoreException e8) {
        }
        p.get(null, null);
        p.getBoolean(null, false);
        p.getByteArray(null, null);
        p.getFloat(null, 0.1f);
        p.getDouble(null, 0.1);
        p.getInt(null, 1);
        p.getLong(null, 1l);
        p.isUserNode();
        try {
            p.keys();
        } catch (BackingStoreException e) {
        }
        p.name();
        p.node(null);
        try {
            p.nodeExists(null);
        } catch (BackingStoreException e1) {
        }
        p.parent();
        p.put(null, null);
        p.putBoolean(null, false);
        p.putByteArray(null, null);
        p.putDouble(null, 1);
        p.putFloat(null, 1f);
        p.putInt(null, 1);
        p.putLong(null, 1l);
        p.remove(null);
        try {
            p.removeNode();
        } catch (BackingStoreException e2) {
        }
        p.addNodeChangeListener(null);
        p.addPreferenceChangeListener(null);
        p.removeNodeChangeListener(null);
        p.removePreferenceChangeListener(null);
        try {
            p.sync();
        } catch (BackingStoreException e3) {
        }
        p.toString();
    }

    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "Preferences",
        args = {}
    )
    public void testConstructor() {
        MockPreferences mp = new MockPreferences();
        assertEquals(mp.getClass(), MockPreferences.class);
    }

    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "Check existed implementation",
        method = "toString",
        args = {}
    )
    public void testToString() {
        Preferences p1 = Preferences.userNodeForPackage(Preferences.class);
        assertNotNull(p1.toString());

        Preferences p2 = Preferences.systemRoot();
        assertNotNull(p2.toString());

        Preferences p3 = Preferences.userRoot();
        assertNotNull(p3.toString());
    }
    /**
     * @test java.util.prefs.Preferences#absolutePath()
     *
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "absolutePath",
        args = {}
    )
    public void testAbsolutePath() {
        Preferences p = Preferences.userNodeForPackage(Preferences.class);
        assertEquals("/java/util/prefs", p.absolutePath());

    }

    /**
     * @test java.util.prefs.Preferences#childrenNames()
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "childrenNames",
        args = {}
    )
    public void testChildrenNames() throws BackingStoreException {
        Preferences pref = Preferences.userNodeForPackage(Preferences.class);

        Preferences child1 = pref.node("child1");

        pref.node("child2");
        pref.node("child3");
        child1.node("subchild1");

        assertSame(pref, child1.parent());
        assertEquals(3, pref.childrenNames().length);
        assertEquals("child1", pref.childrenNames()[0]);
        assertEquals(1, child1.childrenNames().length);
        assertEquals("subchild1", child1.childrenNames()[0]);
    }

    /**
     * @test java.util.prefs.Preferences#clear()
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "clear",
        args = {}
    )
    public void testClear() throws BackingStoreException {
        Preferences pref = Preferences.userNodeForPackage(Preferences.class);
        pref.put("testClearKey", "testClearValue");
        pref.put("testClearKey1", "testClearValue1");
        assertEquals("testClearValue", pref.get("testClearKey", null));
        assertEquals("testClearValue1", pref.get("testClearKey1", null));
        pref.clear();
        assertNull(pref.get("testClearKey", null));
        assertNull(pref.get("testClearKey1", null));
    }

    /**
     * @test java.util.prefs.Preferences#get(String key, String def)
     *
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "get",
        args = {java.lang.String.class, java.lang.String.class}
    )
    public void testGet() throws BackingStoreException {
        Preferences root = Preferences.userNodeForPackage(Preferences.class);
        Preferences pref = root.node("mock");
        assertNull(pref.get("", null));
        assertEquals("default", pref.get("key", "default"));
        assertNull(pref.get("key", null));
        pref.put("testGetkey", "value");
        assertNull(pref.get("testGetKey", null));
        assertEquals("value", pref.get("testGetkey", null));

        try {
            pref.get(null, "abc");
            fail();
        } catch (NullPointerException e) {
        }
        pref.get("", "abc");
        pref.get("key", null);
        pref.get("key", "");
        pref.putFloat("floatKey", 1.0f);
        assertEquals("1.0", pref.get("floatKey", null));

        pref.removeNode();
        try {
            pref.get("key", "abc");
            fail();
        } catch (IllegalStateException e) {
        }
        try {
            pref.get(null, "abc");
            fail();
        } catch (NullPointerException e) {
        }
    }

    /**
     * @test java.util.prefs.Preferences#getBoolean(String key, boolean def)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "getBoolean",
        args = {java.lang.String.class, boolean.class}
    )
    public void testGetBoolean() {
        Preferences pref = Preferences.userNodeForPackage(Preferences.class);
        try {
            pref.getBoolean(null, false);
            fail();
        } catch (NullPointerException e) {
        }

        pref.put("testGetBooleanKey", "false");
        pref.put("testGetBooleanKey2", "value");
        assertFalse(pref.getBoolean("testGetBooleanKey", true));
        assertTrue(pref.getBoolean("testGetBooleanKey2", true));
    }

    /**
     * @test java.util.prefs.Preferences#getByteArray(String key, byte[] def)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "getByteArray",
        args = {java.lang.String.class, byte[].class}
    )
    public void testGetByteArray() {
        Preferences pref = Preferences.userNodeForPackage(Preferences.class);
        try {
            pref.getByteArray(null, new byte[0]);
            fail();
        } catch (NullPointerException e) {
        }
        byte[] b64Array = new byte[] { 0x59, 0x57, 0x4a, 0x6a };// BASE64

        pref.put("testGetByteArrayKey", "abc=");
        pref.put("testGetByteArrayKey2", new String(b64Array));
        pref.put("invalidKey", "<>?");
        assertTrue(Arrays.equals(new byte[] { 105, -73 }, pref.getByteArray(
                "testGetByteArrayKey", new byte[0])));
        assertTrue(Arrays.equals(new byte[] { 'a', 'b', 'c' }, pref
                .getByteArray("testGetByteArrayKey2", new byte[0])));
        assertTrue(Arrays.equals(new byte[0], pref.getByteArray("invalidKey",
                new byte[0])));

        pref.putByteArray("testGetByteArrayKey3", b64Array);
        pref.putByteArray("testGetByteArrayKey4", "abc".getBytes());
        assertTrue(Arrays.equals(b64Array, pref.getByteArray(
                "testGetByteArrayKey3", new byte[0])));
        assertTrue(Arrays.equals("abc".getBytes(), pref.getByteArray(
                "testGetByteArrayKey4", new byte[0])));
    }

    /**
     * @test java.util.prefs.Preferences#getDouble(String key, double def)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "getDouble",
        args = {java.lang.String.class, double.class}
    )
    public void testGetDouble() {
        Preferences pref = Preferences.userNodeForPackage(Preferences.class);
        try {
            pref.getDouble(null, 0);
            fail();
        } catch (NullPointerException e) {
        }

        pref.put("testGetDoubleKey", "1");
        pref.put("testGetDoubleKey2", "value");
        pref.putDouble("testGetDoubleKey3", 1);
        pref.putInt("testGetDoubleKey4", 1);
        assertEquals(1.0, pref.getDouble("testGetDoubleKey", 0.0), 0);
        assertEquals(0.0, pref.getDouble("testGetDoubleKey2", 0.0), 0);
        assertEquals(1.0, pref.getDouble("testGetDoubleKey3", 0.0), 0);
        assertEquals(1.0, pref.getDouble("testGetDoubleKey4", 0.0), 0);
    }

    /**
     * @test java.util.prefs.Preferences#getFloat(String key, float def)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "getFloat",
        args = {java.lang.String.class, float.class}
    )
    public void testGetFloat() {
        Preferences pref = Preferences.userNodeForPackage(Preferences.class);
        try {
            pref.getFloat(null, 0f);
            fail();
        } catch (NullPointerException e) {
        }
        pref.put("testGetFloatKey", "1");
        pref.put("testGetFloatKey2", "value");
        assertEquals(1f, pref.getFloat("testGetFloatKey", 0f), 0);
        assertEquals(0f, pref.getFloat("testGetFloatKey2", 0f), 0);
    }

    /**
     * @test java.util.prefs.Preferences#getInt(String key, int def)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "getInt",
        args = {java.lang.String.class, int.class}
    )
    public void testGetInt() {
        Preferences pref = Preferences.userNodeForPackage(Preferences.class);
        try {
            pref.getInt(null, 0);
            fail();
        } catch (NullPointerException e) {
        }

        pref.put("testGetIntKey", "1");
        pref.put("testGetIntKey2", "value");
        assertEquals(1, pref.getInt("testGetIntKey", 0));
        assertEquals(0, pref.getInt("testGetIntKey2", 0));
    }

    /**
     * @test java.util.prefs.Preferences#getLong(String key, long def)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "getLong",
        args = {java.lang.String.class, long.class}
    )
    public void testGetLong() {
        Preferences pref = Preferences.userNodeForPackage(Preferences.class);
        try {
            pref.getLong(null, 0);
            fail();
        } catch (NullPointerException e) {
        }

        pref.put("testGetLongKey", "1");
        pref.put("testGetLongKey2", "value");
        assertEquals(1, pref.getInt("testGetLongKey", 0));
        assertEquals(0, pref.getInt("testGetLongKey2", 0));
    }

    /**
     * @test java.util.prefs.Preferences#isUserNode()
     *
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "isUserNode",
        args = {}
    )
    public void testIsUserNode() {
        Preferences pref1 = Preferences.userNodeForPackage(Preferences.class);
        assertTrue(pref1.isUserNode());

        Preferences pref2 = Preferences.systemNodeForPackage(Preferences.class);
        assertFalse(pref2.isUserNode());
    }

    /**
     * @test java.util.prefs.Preferences#keys()
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "Exceptions checking missed, but method is abstract, probably it is OK",
        method = "keys",
        args = {}
    )
    public void testKeys() throws BackingStoreException {
        Preferences pref = Preferences.userNodeForPackage(Preferences.class);
        pref.clear();

        pref.put("key0", "value");
        pref.put("key1", "value1");
        pref.put("key2", "value2");
        pref.put("key3", "value3");

        String[] keys = pref.keys();
        assertEquals(4, keys.length);
        for (int i = 0; i < keys.length; i++) {
            assertEquals(0, keys[i].indexOf("key"));
            assertEquals(4, keys[i].length());
        }
    }

    /**
     * @test java.util.prefs.Preferences#name()
     *
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "name",
        args = {}
    )
    public void testName() {
        Preferences pref = Preferences.userNodeForPackage(Preferences.class);
        Preferences child = pref.node("mock");
        assertEquals("mock", child.name());
    }

    /**
     * @test java.util.prefs.Preferences#node(String pathName)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "node",
        args = {java.lang.String.class}
    )
    public void testNode() throws BackingStoreException {
        StringBuffer name = new StringBuffer(Preferences.MAX_NAME_LENGTH);
        for (int i = 0; i < Preferences.MAX_NAME_LENGTH; i++) {
            name.append('a');
        }
        String longName = name.toString();

        Preferences root = Preferences.userRoot();
        Preferences parent = Preferences
                .userNodeForPackage(Preferences.class);
        Preferences pref = parent.node("mock");

        try {
            pref.node(null);
            fail();
        } catch (NullPointerException e) {
        }
        try {
            pref.node("/java/util/prefs/");
            fail();
        } catch (IllegalArgumentException e) {
        }
        try {
            pref.node("/java//util/prefs");
            fail();
        } catch (IllegalArgumentException e) {
        }
        try {
            pref.node(longName + "a");
            fail();
        } catch (IllegalArgumentException e) {
        }
        assertNotNull(pref.node(longName));

        assertSame(root, pref.node("/"));

        Preferences prefs = pref.node("/java/util/prefs");
        assertSame(prefs, parent);

        assertSame(pref, pref.node(""));

        if (!(pref instanceof MockAbstractPreferences)) {
            return;
        }
        MockAbstractPreferences child = (MockAbstractPreferences) ((MockAbstractPreferences) pref)
                .publicChildSpi("child");
        assertSame(child, pref.node("child"));

        Preferences child2 = pref.node("child2");
        assertSame(child2, ((MockAbstractPreferences) pref)
                .publicChildSpi("child2"));

        Preferences grandchild = pref.node("child/grandchild");
        assertSame(grandchild, child.childSpi("grandchild"));
        assertSame(grandchild, child.cachedChildrenImpl()[0]);
        grandchild.removeNode();
        assertNotSame(grandchild, pref.node("child/grandchild"));

        grandchild = pref.node("child3/grandchild");
        AbstractPreferences[] childs = ((MockAbstractPreferences) pref)
                .cachedChildrenImpl();
        Preferences child3 = child;
        for (int i = 0; i < childs.length; i++) {
            if (childs[i].name().equals("child3")) {
                child3 = childs[i];
                break;
            }
        }
        assertSame(child3, grandchild.parent());
    }

    /**
     * @test java.util.prefs.Preferences#nodeExists(String pathName)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException & BackingStoreException checking missed, but method is abstract, probably it is OK",
        method = "nodeExists",
        args = {java.lang.String.class}
    )
    public void testNodeExists() throws BackingStoreException {

        Preferences parent = Preferences
                .userNodeForPackage(Preferences.class);
        Preferences pref = parent.node("mock");

        try {
            pref.nodeExists(null);
            fail();
        } catch (NullPointerException e) {
        }
        try {
            pref.nodeExists("/java/util/prefs/");
            fail();
        } catch (IllegalArgumentException e) {
        }
        try {
            pref.nodeExists("/java//util/prefs");
            fail();
        } catch (IllegalArgumentException e) {
        }

        assertTrue(pref.nodeExists("/"));

        assertTrue(pref.nodeExists("/java/util/prefs"));

        assertTrue(pref.nodeExists(""));

        assertFalse(pref.nodeExists("child"));
        Preferences grandchild = pref.node("child/grandchild");
        assertTrue(pref.nodeExists("child"));
        assertTrue(pref.nodeExists("child/grandchild"));
        grandchild.removeNode();
        assertTrue(pref.nodeExists("child"));
        assertFalse(pref.nodeExists("child/grandchild"));
        assertFalse(grandchild.nodeExists(""));

        assertFalse(pref.nodeExists("child2/grandchild"));
        pref.node("child2/grandchild");
        assertTrue(pref.nodeExists("child2/grandchild"));
    }

    /**
     * @test java.util.prefs.Preferences#parent()
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "parent",
        args = {}
    )
    public void testParent() {
        Preferences parent = Preferences
                .userNodeForPackage(Preferences.class);
        Preferences pref = parent.node("mock");

        assertSame(parent, pref.parent());

    }

    /**
     * @test java.util.prefs.Preferences#put(String key, String value)
     *
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "put",
        args = {java.lang.String.class, java.lang.String.class}
    )
    public void testPut() throws BackingStoreException {
        Preferences pref = Preferences
        .userNodeForPackage(Preferences.class);
        pref.put("", "emptyvalue");
        assertEquals("emptyvalue", pref.get("", null));
        pref.put("testPutkey", "value1");
        assertEquals("value1", pref.get("testPutkey", null));
        pref.put("testPutkey", "value2");
        assertEquals("value2", pref.get("testPutkey", null));

        pref.put("", "emptyvalue");
        assertEquals("emptyvalue", pref.get("", null));

        try {
            pref.put(null, "value");
            fail();
        } catch (NullPointerException e) {
        }
        try {
            pref.put("key", null);
            fail();
        } catch (NullPointerException e) {
        }
        pref.put(longKey, longValue);
        try {
            pref.put(longKey + 1, longValue);
            fail();
        } catch (IllegalArgumentException e) {
        }
        try {
            pref.put(longKey, longValue + 1);
            fail();
        } catch (IllegalArgumentException e) {
        }

        pref.removeNode();
        try {
            pref.put(longKey, longValue + 1);
            fail();
        } catch (IllegalArgumentException e) {
        }

        try {
            pref.put(longKey, longValue);
            fail();
        } catch (IllegalStateException e) {
        }
    }

    /**
     * @test java.util.prefs.Preferences#putBoolean(String key, boolean value)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "putBoolean",
        args = {java.lang.String.class, boolean.class}
    )
    public void testPutBoolean() {
        Preferences pref = Preferences
        .userNodeForPackage(Preferences.class);
        try {
            pref.putBoolean(null, false);
            fail();
        } catch (NullPointerException e) {
        }
        pref.putBoolean(longKey, false);
        try {
            pref.putBoolean(longKey + "a", false);
            fail();
        } catch (IllegalArgumentException e) {
        }
        pref.putBoolean("testPutBooleanKey", false);
        assertEquals("false", pref.get("testPutBooleanKey", null));
        assertFalse(pref.getBoolean("testPutBooleanKey", true));
    }

    /**
     * @test java.util.prefs.Preferences#putDouble(String key, double value)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "putDouble",
        args = {java.lang.String.class, double.class}
    )
    public void testPutDouble() {
        Preferences pref = Preferences
        .userNodeForPackage(Preferences.class);
        try {
            pref.putDouble(null, 3);
            fail();
        } catch (NullPointerException e) {
        }
        pref.putDouble(longKey, 3);
        try {
            pref.putDouble(longKey + "a", 3);
            fail();
        } catch (IllegalArgumentException e) {
        }
        pref.putDouble("testPutDoubleKey", 3);
        assertEquals("3.0", pref.get("testPutDoubleKey", null));
        assertEquals(3, pref.getDouble("testPutDoubleKey", 0), 0);
    }

    /**
     * @test java.util.prefs.Preferences#putFloat(String key, float value)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "putFloat",
        args = {java.lang.String.class, float.class}
    )
    public void testPutFloat() {
        Preferences pref = Preferences
        .userNodeForPackage(Preferences.class);
        try {
            pref.putFloat(null, 3f);
            fail();
        } catch (NullPointerException e) {
        }
        pref.putFloat(longKey, 3f);
        try {
            pref.putFloat(longKey + "a", 3f);
            fail();
        } catch (IllegalArgumentException e) {
        }
        pref.putFloat("testPutFloatKey", 3f);
        assertEquals("3.0", pref.get("testPutFloatKey", null));
        assertEquals(3f, pref.getFloat("testPutFloatKey", 0), 0);
    }

    /**
     * @test java.util.prefs.Preferences#putInt(String key, int value)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "putInt",
        args = {java.lang.String.class, int.class}
    )
    public void testPutInt() {
        Preferences pref = Preferences
        .userNodeForPackage(Preferences.class);
        try {
            pref.putInt(null, 3);
            fail();
        } catch (NullPointerException e) {
        }
        pref.putInt(longKey, 3);
        try {
            pref.putInt(longKey + "a", 3);
            fail();
        } catch (IllegalArgumentException e) {
        }
        pref.putInt("testPutIntKey", 3);
        assertEquals("3", pref.get("testPutIntKey", null));
        assertEquals(3, pref.getInt("testPutIntKey", 0));
    }

    /**
     * @test java.util.prefs.Preferences#putLong(String key, long value)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "putLong",
        args = {java.lang.String.class, long.class}
    )
    public void testPutLong() {
        Preferences pref = Preferences
        .userNodeForPackage(Preferences.class);
        try {
            pref.putLong(null, 3L);
            fail();
        } catch (NullPointerException e) {
        }
        pref.putLong(longKey, 3L);
        try {
            pref.putLong(longKey + "a", 3L);
            fail();
        } catch (IllegalArgumentException e) {
        }
        pref.putLong("testPutLongKey", 3L);
        assertEquals("3", pref.get("testPutLongKey", null));
        assertEquals(3L, pref.getLong("testPutLongKey", 0));
    }

    /**
     * @test java.util.prefs.Preferences#putByteArray(String key, byte[] value)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "putByteArray",
        args = {java.lang.String.class, byte[].class}
    )
    public void testPutByteArray() {
        Preferences pref = Preferences
        .userNodeForPackage(Preferences.class);
        try {
            pref.putByteArray(null, new byte[0]);
            fail();
        } catch (NullPointerException e) {
        }
        try {
            pref.putByteArray("testPutByteArrayKey4", null);
            fail();
        } catch (NullPointerException e) {
        }

        pref.putByteArray(longKey, new byte[0]);
        try {
            pref.putByteArray(longKey + "a", new byte[0]);
            fail();
        } catch (IllegalArgumentException e) {
        }
        byte[] longArray = new byte[(int) (Preferences.MAX_VALUE_LENGTH * 0.74)];
        byte[] longerArray = new byte[(int) (Preferences.MAX_VALUE_LENGTH * 0.75) + 1];
        pref.putByteArray(longKey, longArray);
        try {
            pref.putByteArray(longKey, longerArray);
            fail();
        } catch (IllegalArgumentException e) {
        }

        pref.putByteArray("testPutByteArrayKey", new byte[0]);
        assertEquals("", pref.get("testPutByteArrayKey", null));
        assertTrue(Arrays.equals(new byte[0], pref.getByteArray(
                "testPutByteArrayKey", null)));

        pref.putByteArray("testPutByteArrayKey3", new byte[] { 'a', 'b', 'c' });
        assertEquals("YWJj", pref.get("testPutByteArrayKey3", null));
        assertTrue(Arrays.equals(new byte[] { 'a', 'b', 'c' }, pref
                .getByteArray("testPutByteArrayKey3", null)));
    }

    /**
     * @test java.util.prefs.Preferences#remove(String key)
     *
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "remove",
        args = {java.lang.String.class}
    )
    public void testRemove() throws BackingStoreException {
        Preferences pref = Preferences
        .userNodeForPackage(Preferences.class);
        pref.remove("key");

        pref.put("key", "value");
        assertEquals("value", pref.get("key", null));
        pref.remove("key");
        assertNull(pref.get("key", null));

        pref.remove("key");

        try {
            pref.remove(null);
            fail();
        } catch (NullPointerException e) {
        }

        pref.removeNode();
        try {
            pref.remove("key");
            fail();
        } catch (IllegalStateException e) {
        }
    }

    /**
     * @test java.util.prefs.Preferences#removeNode()
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "Exceptions checking missed, but method is abstract, probably it is OK",
        method = "removeNode",
        args = {}
    )
    public void testRemoveNode() throws BackingStoreException {
        Preferences pref = Preferences
        .userNodeForPackage(Preferences.class);
        Preferences child = pref.node("child");
        Preferences child1 = pref.node("child1");
        Preferences grandchild = child.node("grandchild");

        pref.removeNode();

        assertFalse(child.nodeExists(""));
        assertFalse(child1.nodeExists(""));
        assertFalse(grandchild.nodeExists(""));
        assertFalse(pref.nodeExists(""));
    }


    /**
     * @test java.util.prefs.Preferences#addNodeChangeListener(NodeChangeListener ncl)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "Only NullPointerException checked, but method is abstract, probably it is OK",
        method = "addNodeChangeListener",
        args = {java.util.prefs.NodeChangeListener.class}
    )
    public void testAddNodeChangeListener() throws BackingStoreException {
        Preferences pref = Preferences.userNodeForPackage(Preferences.class);
        try {
            pref.addNodeChangeListener(null);
            fail();
        } catch (NullPointerException e) {
        }

        Preferences child1 = null;
        Preferences child2 = null;
        Preferences child3 = null;

        MockNodeChangeListener nl = null;
        // To get existed node doesn't create the change event
        try {
            nl = new MockNodeChangeListener();
            pref.addNodeChangeListener(nl);
            child1 = pref.node("mock1");
            nl.waitForEvent();
            assertEquals(1, nl.getAdded());
            nl.reset();
            child2 = pref.node("mock1");
            nl.waitForEvent();
            assertEquals(0, nl.getAdded());
            nl.reset();
        } finally {
            pref.removeNodeChangeListener(nl);
            child1.removeNode();
        }
        // same listener can be added twice, and must be removed twice
        try {
            nl = new MockNodeChangeListener();
            pref.addNodeChangeListener(nl);
            pref.addNodeChangeListener(nl);
            child1 = pref.node("mock2");
            nl.waitForEvent();
            assertEquals(2, nl.getAdded());
            nl.reset();
        } finally {
            pref.removeNodeChangeListener(nl);
            pref.removeNodeChangeListener(nl);
            child1.removeNode();
        }
        // test remove event
        try {
            nl = new MockNodeChangeListener();
            pref.addNodeChangeListener(nl);
            child1 = pref.node("mock3");
            child1.removeNode();
            nl.waitForEvent();
            assertEquals(1, nl.getRemoved());
            nl.reset();
        } finally {
            pref.removeNodeChangeListener(nl);
        }
        // test remove event with two listeners
        try {
            nl = new MockNodeChangeListener();
            pref.addNodeChangeListener(nl);
            pref.addNodeChangeListener(nl);
            child1 = pref.node("mock6");
            child1.removeNode();
            nl.waitForEvent();
            assertEquals(2, nl.getRemoved());
            nl.reset();
        } finally {
            pref.removeNodeChangeListener(nl);
            pref.removeNodeChangeListener(nl);
        }
        // test add/remove indirect children, or remove several children at the
        // same time
        try {
            nl = new MockNodeChangeListener();
            child1 = pref.node("mock4");
            child1.addNodeChangeListener(nl);
            child2 = pref.node("mock4/mock5");
            nl.waitForEvent();
            assertEquals(1, nl.getAdded());
            nl.reset();
            child3 = pref.node("mock4/mock5/mock6");
            nl.waitForEvent();
            assertEquals(0, nl.getAdded());
            nl.reset();

            child3.removeNode();
            nl.waitForEvent();
            assertEquals(0, nl.getRemoved());
            nl.reset();

            child3 = pref.node("mock4/mock7");
            nl.waitForEvent();
            assertEquals(1, nl.getAdded());
            nl.reset();

            child1.removeNode();
            nl.waitForEvent();
            assertEquals(2, nl.getRemoved()); // fail 1
            nl.reset();
        } finally {
            try {
                child1.removeNode();
            } catch (Exception e) {
            }
        }

    }

    /**
     * @test java.util.prefs.Preferences#addPreferenceChangeListener(PreferenceChangeListener pcl)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "Only NullPointerException checked, but method is abstract, probably it is OK",
        method = "addPreferenceChangeListener",
        args = {java.util.prefs.PreferenceChangeListener.class}
    )
    public void testAddPreferenceChangeListener() {

        Preferences pref = Preferences.userNodeForPackage(Preferences.class);
        MockPreferenceChangeListener pl = null;

        try {
            pref.addPreferenceChangeListener(null);
            fail();
        } catch (NullPointerException e) {
        }

        // To get existed node doesn't create the change event
        try {
            pl = new MockPreferenceChangeListener();
            pref.addPreferenceChangeListener(pl);
            pref.putInt("mock1", 123);
            pl.waitForEvent();
            assertEquals(1, pl.getChanged());
            pref.putLong("long_key", Long.MAX_VALUE);
            pl.waitForEvent(2);
            assertEquals(2, pl.getChanged());
            pl.reset();
            try {
                pref.clear();
                pl.waitForEvent(2);
                assertEquals(2, pl.getChanged()); // fail 1
            } catch(BackingStoreException bse) {
                pl.reset();
                fail("BackingStoreException is thrown");
            }
            pl.reset();
        } finally {
            pref.removePreferenceChangeListener(pl);
            //child1.removeNode();
        }

        // same listener can be added twice, and must be removed twice
        try {
            pl = new MockPreferenceChangeListener();
            pref.addPreferenceChangeListener(pl);
            pref.addPreferenceChangeListener(pl);
            pref.putFloat("float_key", Float.MIN_VALUE);
            pl.waitForEvent(2);
            assertEquals(2, pl.getChanged());
            pl.reset();
        } finally {
            pref.removePreferenceChangeListener(pl);
            pref.removePreferenceChangeListener(pl);

        }
        // test remove event
        try {
            pl = new MockPreferenceChangeListener();
            pref.addPreferenceChangeListener(pl);
            pref.putDouble("double_key", Double.MAX_VALUE);
            pl.waitForEvent();
            assertEquals(1, pl.getChanged());
            try {
                pref.clear();
                pl.waitForEvent(3);
                assertEquals(3, pl.getChanged()); // fails
            } catch(BackingStoreException bse) {
                fail("BackingStoreException is thrown");
            }
            pl.reset();
        } finally {
            pref.removePreferenceChangeListener(pl);
        }
        // test remove event with two listeners
        try {
            pl = new MockPreferenceChangeListener();
            pref.addPreferenceChangeListener(pl);
            pref.addPreferenceChangeListener(pl);
            pref.putByteArray("byte_array_key", new byte [] {1 ,2 , 3});
            try {
                pref.clear();
                pl.waitForEvent(4);
                assertEquals(4, pl.getChanged());
            } catch(BackingStoreException bse) {
                fail("BackingStoreException is thrown");
            }
            pl.reset();
        } finally {
            pref.removePreferenceChangeListener(pl);
            pref.removePreferenceChangeListener(pl);
        }

    }

    /**
     * @test java.util.prefs.Preferences#removeNodeChangeListener(NodeChangeListener ncl)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "removeNodeChangeListener",
        args = {java.util.prefs.NodeChangeListener.class}
    )
    public void testRemoveNodeChangeListener() {
        Preferences pref = Preferences.userNodeForPackage(Preferences.class);
        try {
            pref.removeNodeChangeListener(null);
            fail();
        } catch (IllegalArgumentException e) {
        }
        MockNodeChangeListener l1 = new MockNodeChangeListener();
        MockNodeChangeListener l2 = new MockNodeChangeListener();
        pref.addNodeChangeListener(l1);
        pref.addNodeChangeListener(l1);

        pref.removeNodeChangeListener(l1);
        pref.removeNodeChangeListener(l1);
        try {
            pref.removeNodeChangeListener(l1);
            fail();
        } catch (IllegalArgumentException e) {
        }
        try {
            pref.removeNodeChangeListener(l2);
            fail();
        } catch (IllegalArgumentException e) {
        }
    }

    /**
     * @test java.util.prefs.Preferences#removePreferenceChangeListener(PreferenceChangeListener pcl)
     *
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "IllegalStateException checking missed, but method is abstract, probably it is OK",
        method = "removePreferenceChangeListener",
        args = {java.util.prefs.PreferenceChangeListener.class}
    )
    public void testRemovePreferenceChangeListener() {
        Preferences pref = Preferences.userNodeForPackage(Preferences.class);
        try {
            pref.removePreferenceChangeListener(null);
            fail();
        } catch (IllegalArgumentException e) {
        }
        MockPreferenceChangeListener l1 = new MockPreferenceChangeListener();
        MockPreferenceChangeListener l2 = new MockPreferenceChangeListener();
        pref.addPreferenceChangeListener(l1);
        pref.addPreferenceChangeListener(l1);
        try {
            pref.removePreferenceChangeListener(l2);
            fail();
        } catch (IllegalArgumentException e) {
        }
        pref.removePreferenceChangeListener(l1);
        pref.removePreferenceChangeListener(l1);
        try {
            pref.removePreferenceChangeListener(l1);
            fail();
        } catch (IllegalArgumentException e) {
        }

    }

    static class MockInputStream extends InputStream {

        static final int normal = 0;

        static final int exception = 1;

        static final int runtimeException = 2;

        int result = normal;

        InputStream wrapper;

        public void setResult(int i) {
            result = i;
        }

        private void checkException() throws IOException {
            switch (result) {
            case normal:
                return;
            case exception:
                throw new IOException("test");
            case runtimeException:
                throw new RuntimeException("test");
            }
        }

        public MockInputStream(InputStream in) {
            wrapper = in;
        }

        @Override
        public int read() throws IOException {
            checkException();
            return wrapper.read();
        }
    }

    @SuppressWarnings("unused")
    static class MockPreferences extends Preferences {

        public MockPreferences() {
            super();
        }

        @Override
        public String absolutePath() {
            return null;
        }

        @Override
        public String[] childrenNames() throws BackingStoreException {
            return null;
        }

        @Override
        public void clear() throws BackingStoreException {
        }

        @Override
        public void exportNode(OutputStream ostream) throws IOException,
                BackingStoreException {
        }

        @Override
        public void exportSubtree(OutputStream ostream) throws IOException,
                BackingStoreException {
        }

        @Override
        public void flush() throws BackingStoreException {
        }

        @Override
        public String get(String key, String deflt) {
            return null;
        }

        @Override
        public boolean getBoolean(String key, boolean deflt) {
            return false;
        }

        @Override
        public byte[] getByteArray(String key, byte[] deflt) {
            return null;
        }

        @Override
        public double getDouble(String key, double deflt) {
            return 0;
        }

        @Override
        public float getFloat(String key, float deflt) {
            return 0;
        }

        @Override
        public int getInt(String key, int deflt) {
            return 0;
        }

        @Override
        public long getLong(String key, long deflt) {
            return 0;
        }

        @Override
        public boolean isUserNode() {
            return false;
        }

        @Override
        public String[] keys() throws BackingStoreException {
            return null;
        }

        @Override
        public String name() {
            return null;
        }

        @Override
        public Preferences node(String name) {
            return null;
        }

        @Override
        public boolean nodeExists(String name) throws BackingStoreException {
            return false;
        }

        @Override
        public Preferences parent() {
            return null;
        }

        @Override
        public void put(String key, String value) {

        }

        @Override
        public void putBoolean(String key, boolean value) {

        }

        @Override
        public void putByteArray(String key, byte[] value) {

        }

        @Override
        public void putDouble(String key, double value) {

        }

        @Override
        public void putFloat(String key, float value) {

        }

        @Override
        public void putInt(String key, int value) {

        }

        @Override
        public void putLong(String key, long value) {

        }

        @Override
        public void remove(String key) {

        }

        @Override
        public void removeNode() throws BackingStoreException {

        }

        @Override
        public void addNodeChangeListener(NodeChangeListener ncl) {

        }

        @Override
        public void addPreferenceChangeListener(PreferenceChangeListener pcl) {

        }

        @Override
        public void removeNodeChangeListener(NodeChangeListener ncl) {

        }

        @Override
        public void removePreferenceChangeListener(PreferenceChangeListener pcl) {

        }

        @Override
        public void sync() throws BackingStoreException {

        }

        @Override
        public String toString() {
            return null;
        }

    }

}
