java/util/TreeMapTest.java

/*
 *  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 tests.api.java.util;

import dalvik.annotation.KnownFailure;
import dalvik.annotation.TestTargetNew;
import dalvik.annotation.TestTargets;
import dalvik.annotation.TestLevel;
import dalvik.annotation.TestTargetClass;
import dalvik.annotation.AndroidOnly;

import java.io.Serializable;
import java.text.CollationKey;
import java.text.Collator;
import java.util.AbstractMap;
import java.util.Collection;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;

import org.apache.harmony.testframework.serialization.SerializationTest;

import tests.support.Support_MapTest2;
import tests.support.Support_UnmodifiableCollectionTest;

@TestTargetClass(TreeMap.class)
public class TreeMapTest extends junit.framework.TestCase {

    public static class ReversedComparator implements Comparator {
        public int compare(Object o1, Object o2) {
            return -(((Comparable) o1).compareTo(o2));
        }

        public boolean equals(Object o1, Object o2) {
            return (((Comparable) o1).compareTo(o2)) == 0;
        }
    }

    // Regression for Harmony-1026
    public static class MockComparator<T extends Comparable<T>> implements
            Comparator<T>, Serializable {

        public int compare(T o1, T o2) {
            if (o1 == o2) {
                return 0;
            }
            if (null == o1 || null == o2) {
                return -1;
            }
            T c1 = o1;
            T c2 = o2;
            return c1.compareTo(c2);
        }
    }

    // Regression for Harmony-1161
    class MockComparatorNullTolerable implements Comparator<String> {

        public int compare(String o1, String o2) {
            if (o1 == o2) {
                return 0;
            }
            if (null == o1) {
                return -1;
            }
            if (null == o2) {
                return 1;
            }
            return o1.compareTo(o2);
        }
    }

    TreeMap tm;

    Object objArray[] = new Object[1000];

    /**
     * @tests java.util.TreeMap#TreeMap()
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "TreeMap",
        args = {}
    )
    public void test_Constructor() {
        // Test for method java.util.TreeMap()
        new Support_MapTest2(new TreeMap()).runTest();

        assertTrue("New treeMap non-empty", new TreeMap().isEmpty());
    }

    /**
     * @tests java.util.TreeMap#TreeMap(java.util.Comparator)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "TreeMap",
        args = {java.util.Comparator.class}
    )
    public void test_ConstructorLjava_util_Comparator() {
        // Test for method java.util.TreeMap(java.util.Comparator)
        Comparator comp = new ReversedComparator();
        TreeMap reversedTreeMap = new TreeMap(comp);
        assertTrue("TreeMap answered incorrect comparator", reversedTreeMap
                .comparator() == comp);
        reversedTreeMap.put(new Integer(1).toString(), new Integer(1));
        reversedTreeMap.put(new Integer(2).toString(), new Integer(2));
        assertTrue("TreeMap does not use comparator (firstKey was incorrect)",
                reversedTreeMap.firstKey().equals(new Integer(2).toString()));
        assertTrue("TreeMap does not use comparator (lastKey was incorrect)",
                reversedTreeMap.lastKey().equals(new Integer(1).toString()));

    }

    /**
     * @tests java.util.TreeMap#TreeMap(java.util.Map)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "TreeMap",
        args = {java.util.Map.class}
    )
    public void test_ConstructorLjava_util_Map() {
        // Test for method java.util.TreeMap(java.util.Map)
        TreeMap myTreeMap = new TreeMap(new HashMap(tm));
        assertTrue("Map is incorrect size", myTreeMap.size() == objArray.length);
        for (Object element : objArray) {
            assertTrue("Map has incorrect mappings", myTreeMap.get(
                    element.toString()).equals(element));
        }

        HashMap hm = new HashMap();
        hm.put(new Integer(1), "one");
        hm.put("one", new Integer(1));

        try {
            new TreeMap(hm);
            fail("ClassCastException expected");
        } catch (ClassCastException e) {
            //expected
        }

        try {
            new TreeMap((Map)null);
            fail("NullPointerException expected");
        } catch (NullPointerException e) {
            //expected
        }
    }

    /**
     * @tests java.util.TreeMap#TreeMap(java.util.SortedMap)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "TreeMap",
        args = {java.util.SortedMap.class}
    )
    public void test_ConstructorLjava_util_SortedMap() {
        // Test for method java.util.TreeMap(java.util.SortedMap)
        Comparator comp = new ReversedComparator();
        TreeMap reversedTreeMap = new TreeMap(comp);
        reversedTreeMap.put(new Integer(1).toString(), new Integer(1));
        reversedTreeMap.put(new Integer(2).toString(), new Integer(2));
        TreeMap anotherTreeMap = new TreeMap(reversedTreeMap);
        assertTrue("New tree map does not answer correct comparator",
                anotherTreeMap.comparator() == comp);
        assertTrue("TreeMap does not use comparator (firstKey was incorrect)",
                anotherTreeMap.firstKey().equals(new Integer(2).toString()));
        assertTrue("TreeMap does not use comparator (lastKey was incorrect)",
                anotherTreeMap.lastKey().equals(new Integer(1).toString()));

        try {
            new TreeMap((SortedMap)null);
            fail("NullPointerException expected");
        } catch (NullPointerException e) {
            //expected
        }
    }

    /**
     * @tests java.util.TreeMap#clear()
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "clear",
        args = {}
    )
    public void test_clear() {
        // Test for method void java.util.TreeMap.clear()
        tm.clear();
        assertEquals("Cleared map returned non-zero size", 0, tm.size());
    }

    /**
     * @tests java.util.TreeMap#clone()
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "clone",
        args = {}
    )
    public void test_clone() {
        // Test for method java.lang.Object java.util.TreeMap.clone()
        TreeMap clonedMap = (TreeMap) tm.clone();
        assertTrue("Cloned map does not equal the original map", clonedMap
                .equals(tm));
        assertTrue("Cloned map is the same reference as the original map",
                clonedMap != tm);
        for (Object element : objArray) {
            assertTrue("Cloned map contains incorrect elements", clonedMap
                    .get(element.toString()) == tm.get(element.toString()));
        }

        TreeMap map = new TreeMap();
        map.put("key", "value");
        // get the keySet() and values() on the original Map
        Set keys = map.keySet();
        Collection values = map.values();
        assertEquals("values() does not work", "value", values.iterator()
                .next());
        assertEquals("keySet() does not work", "key", keys.iterator().next());
        AbstractMap map2 = (AbstractMap) map.clone();
        map2.put("key", "value2");
        Collection values2 = map2.values();
        assertTrue("values() is identical", values2 != values);
        // values() and keySet() on the cloned() map should be different
        assertEquals("values() was not cloned", "value2", values2.iterator()
                .next());
        map2.clear();
        map2.put("key2", "value3");
        Set key2 = map2.keySet();
        assertTrue("keySet() is identical", key2 != keys);
        assertEquals("keySet() was not cloned", "key2", key2.iterator().next());
    }

    /**
     * @tests java.util.TreeMap#comparator()
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "comparator",
        args = {}
    )
    public void test_comparator() {
        // Test for method java.util.Comparator java.util.TreeMap.comparator()\
        Comparator comp = new ReversedComparator();
        TreeMap reversedTreeMap = new TreeMap(comp);
        assertTrue("TreeMap answered incorrect comparator", reversedTreeMap
                .comparator() == comp);
        reversedTreeMap.put(new Integer(1).toString(), new Integer(1));
        reversedTreeMap.put(new Integer(2).toString(), new Integer(2));
        assertTrue("TreeMap does not use comparator (firstKey was incorrect)",
                reversedTreeMap.firstKey().equals(new Integer(2).toString()));
        assertTrue("TreeMap does not use comparator (lastKey was incorrect)",
                reversedTreeMap.lastKey().equals(new Integer(1).toString()));
    }

    /**
     * @tests java.util.TreeMap#containsKey(java.lang.Object)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "containsKey",
        args = {java.lang.Object.class}
    )
    public void test_containsKeyLjava_lang_Object() {
        // Test for method boolean
        // java.util.TreeMap.containsKey(java.lang.Object)
        assertTrue("Returned false for valid key", tm.containsKey("95"));
        assertTrue("Returned true for invalid key", !tm.containsKey("XXXXX"));

        try {
            tm.containsKey(new Double(3.14));
            fail("ClassCastException expected");
        } catch (ClassCastException e) {
            //expected
        }

        try {
            tm.containsKey(null);
            fail("NullPointerException expected");
        } catch (NullPointerException e) {
            //expected
        }
    }

    /**
     * @tests java.util.TreeMap#containsValue(java.lang.Object)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "containsValue",
        args = {java.lang.Object.class}
    )
    public void test_containsValueLjava_lang_Object() {
        // Test for method boolean
        // java.util.TreeMap.containsValue(java.lang.Object)
        assertTrue("Returned false for valid value", tm
                .containsValue(objArray[986]));
        assertTrue("Returned true for invalid value", !tm
                .containsValue(new Object()));
    }

    /**
     * @tests java.util.TreeMap#entrySet()
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "entrySet",
        args = {}
    )
    public void test_entrySet() {
        // Test for method java.util.Set java.util.TreeMap.entrySet()
        Set anEntrySet = tm.entrySet();
        Iterator entrySetIterator = anEntrySet.iterator();
        assertTrue("EntrySet is incorrect size",
                anEntrySet.size() == objArray.length);
        Map.Entry entry;
        while (entrySetIterator.hasNext()) {
            entry = (Map.Entry) entrySetIterator.next();
            assertTrue("EntrySet does not contain correct mappings", tm
                    .get(entry.getKey()) == entry.getValue());
        }
    }

    /**
     * @tests java.util.TreeMap#firstKey()
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "firstKey",
        args = {}
    )
    public void test_firstKey() {
        // Test for method java.lang.Object java.util.TreeMap.firstKey()
        assertEquals("Returned incorrect first key", "0", tm.firstKey());
        tm = new TreeMap();
        try {
            tm.firstKey();
            fail("NoSuchElementException expected");
        } catch (NoSuchElementException e) {
            //expected
        }
    }

    /**
     * @tests java.util.TreeMap#get(java.lang.Object)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "get",
        args = {java.lang.Object.class}
    )
    public void test_getLjava_lang_Object() {
        // Test for method java.lang.Object
        // java.util.TreeMap.get(java.lang.Object)
        Object o = new Object();
        tm.put("Hello", o);
        assertTrue("Failed to get mapping", tm.get("Hello") == o);

        try {
            tm.get(new Double(3.14));
            fail("ClassCastException expected");
        } catch (ClassCastException e) {
            //expected
        }

        try {
            tm.get(null);
            fail("NullPointerException expected");
        } catch (NullPointerException e) {
            //expected
        }
    }

    /**
     * @tests java.util.TreeMap#headMap(java.lang.Object)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "headMap",
        args = {java.lang.Object.class}
    )
    public void test_headMapLjava_lang_Object() {
        // Test for method java.util.SortedMap
        // java.util.TreeMap.headMap(java.lang.Object)
        Map head = tm.headMap("100");
        assertEquals("Returned map of incorrect size", 3, head.size());
        assertTrue("Returned incorrect elements", head.containsKey("0")
                && head.containsValue(new Integer("1"))
                && head.containsKey("10"));
        SortedMap sort = tm.headMap("100");
        try {
            sort.headMap("50");
            fail("IllegalArgumentException expected");
        } catch (IllegalArgumentException e) {
            //expected
        }

        try {
            tm.headMap(this);
            fail("ClassCastException expected");
        } catch (ClassCastException e) {
            //expected
        }

        try {
            tm.headMap(null);
            fail("NullPointerException expected");
        } catch (NullPointerException e) {
            //expected
        }

        // Regression for Harmony-1026
        TreeMap<Integer, Double> map = new TreeMap<Integer, Double>(
                new MockComparator());
        map.put(1, 2.1);
        map.put(2, 3.1);
        map.put(3, 4.5);
        map.put(7, 21.3);
        map.put(null, null);

        SortedMap<Integer, Double> smap = map.headMap(null);
        assertEquals(0, smap.size());

        Set<Integer> keySet = smap.keySet();
        assertEquals(0, keySet.size());

        Set<Map.Entry<Integer, Double>> entrySet = smap.entrySet();
        assertEquals(0, entrySet.size());

        Collection<Double> valueCollection = smap.values();
        assertEquals(0, valueCollection.size());

        // Regression for Harmony-1066
        assertTrue(head instanceof Serializable);

        // Regression for ill-behaved collator
        Collator c = new Collator() {
            @Override
            public int compare(String o1, String o2) {
                if (o1 == null) {
                    return 0;
                }
                return o1.compareTo(o2);
            }

            @Override
            public CollationKey getCollationKey(String string) {
                return null;
            }

            @Override
            public int hashCode() {
                return 0;
            }
        };

        TreeMap<String, String> treemap = new TreeMap<String, String>(c);
        assertEquals(0, treemap.headMap(null).size());
    }

    /**
     * @tests java.util.TreeMap#keySet()
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "keySet",
        args = {}
    )
    public void test_keySet() {
        // Test for method java.util.Set java.util.TreeMap.keySet()
        Set ks = tm.keySet();
        assertTrue("Returned set of incorrect size",
                ks.size() == objArray.length);
        for (int i = 0; i < tm.size(); i++) {
            assertTrue("Returned set is missing keys", ks.contains(new Integer(
                    i).toString()));
        }
    }

    /**
     * @tests java.util.TreeMap#lastKey()
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "lastKey",
        args = {}
    )
    public void test_lastKey() {
        // Test for method java.lang.Object java.util.TreeMap.lastKey()
        assertTrue("Returned incorrect last key", tm.lastKey().equals(
                objArray[objArray.length - 1].toString()));
        tm = new TreeMap();
        try {
            tm.lastKey();
            fail("NoSuchElementException expected");
        } catch (NoSuchElementException e) {
            //expected
        }
    }

    /**
     * @tests java.util.TreeMap#put(java.lang.Object, java.lang.Object)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "put",
        args = {java.lang.Object.class, java.lang.Object.class}
    )
    public void test_putLjava_lang_ObjectLjava_lang_Object() {
        // Test for method java.lang.Object
        // java.util.TreeMap.put(java.lang.Object, java.lang.Object)
        Object o = new Object();
        tm.put("Hello", o);
        assertTrue("Failed to put mapping", tm.get("Hello") == o);

        try {
            tm.put(null, "null");
            fail("NullPointerException expected");
        } catch (NullPointerException e) {
            //expected
        }

        // regression for Harmony-780
        tm = new TreeMap();
        assertNull(tm.put(new Object(), new Object()));
        try {
            tm.put(new Integer(1), new Object());
            fail("should throw ClassCastException");
        } catch (ClassCastException e) {
            // expected
        }

        tm = new TreeMap();
        assertNull(tm.put(new Integer(1), new Object()));

        // regression for Harmony-2474
        tm = new TreeMap();
        tm.remove(o);
    }

    /**
     * @tests java.util.TreeMap#putAll(java.util.Map)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "putAll",
        args = {java.util.Map.class}
    )
    public void test_putAllLjava_util_Map() {
        // Test for method void java.util.TreeMap.putAll(java.util.Map)
        TreeMap x = new TreeMap();
        x.putAll(tm);
        assertTrue("Map incorrect size after put", x.size() == tm.size());
        for (Object element : objArray) {
            assertTrue("Failed to put all elements", x.get(element.toString())
                    .equals(element));
        }
        x = new TreeMap();
        x.put(new Integer(1), "one");
        x.put(new Integer(2), "two");

        try {
            tm.putAll(x);
            fail("ClassCastException expected");
        } catch (ClassCastException e) {
            //expected
        }

        try {
            tm.putAll(null);
            fail("NullPointerException expected");
        } catch (NullPointerException e) {
            //expected
        }
    }

    /**
     * @tests java.util.TreeMap#remove(java.lang.Object)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "remove",
        args = {java.lang.Object.class}
    )
    public void test_removeLjava_lang_Object() {
        // Test for method java.lang.Object
        // java.util.TreeMap.remove(java.lang.Object)
        tm.remove("990");
        assertTrue("Failed to remove mapping", !tm.containsKey("990"));

        try {
            tm.remove(new Double(3.14));
            fail("ClassCastException expected");
        } catch (ClassCastException e) {
            //expected
        }

        try {
            tm.remove(null);
            fail("NullPointerException expected");
        } catch (NullPointerException e) {
            //expected
        }
    }

    /**
     * @tests java.util.TreeMap#size()
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "size",
        args = {}
    )
    public void test_size() {
        // Test for method int java.util.TreeMap.size()
        assertEquals("Returned incorrect size", 1000, tm.size());
    }

    /**
     * @tests java.util.TreeMap#subMap(java.lang.Object, java.lang.Object)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "subMap",
        args = {java.lang.Object.class, java.lang.Object.class}
    )
    public void test_subMapLjava_lang_ObjectLjava_lang_Object() {
        // Test for method java.util.SortedMap
        // java.util.TreeMap.subMap(java.lang.Object, java.lang.Object)
        SortedMap subMap = tm.subMap(objArray[100].toString(), objArray[109]
                .toString());
        assertEquals("subMap is of incorrect size", 9, subMap.size());
        for (int counter = 100; counter < 109; counter++) {
            assertTrue("SubMap contains incorrect elements", subMap.get(
                    objArray[counter].toString()).equals(objArray[counter]));
        }

        try {
            tm.subMap(objArray[9].toString(), objArray[1].toString());
            fail("end key less than start key should throw IllegalArgumentException");
        } catch (IllegalArgumentException e) {
            // Expected
        }

        // Regression for Harmony-1161
        TreeMap<String, String> treeMapWithNull = new TreeMap<String, String>(
                new MockComparatorNullTolerable());
        treeMapWithNull.put("key1", "value1"); //$NON-NLS-1$ //$NON-NLS-2$
        treeMapWithNull.put(null, "value2"); //$NON-NLS-1$
        SortedMap<String, String> subMapWithNull = treeMapWithNull.subMap(null,
                "key1"); //$NON-NLS-1$
        assertEquals("Size of subMap should be 1:", 1, subMapWithNull.size()); //$NON-NLS-1$

        // Regression test for typo in lastKey method
        SortedMap<String, String> map = new TreeMap<String, String>();
        map.put("1", "one"); //$NON-NLS-1$ //$NON-NLS-2$
        map.put("2", "two"); //$NON-NLS-1$ //$NON-NLS-2$
        map.put("3", "three"); //$NON-NLS-1$ //$NON-NLS-2$
        assertEquals("3", map.lastKey());
        SortedMap<String, String> sub = map.subMap("1", "3"); //$NON-NLS-1$ //$NON-NLS-2$
        assertEquals("2", sub.lastKey()); //$NON-NLS-1$

        try {
            tm.subMap(this, this);
            fail("ClassCastException expected");
        } catch (ClassCastException e) {
            //expected
        }

        try {
            tm.subMap(objArray[9].toString(), null);
            fail("NullPointerException expected");
        } catch (NullPointerException e) {
            //expected
        }

        try {
            tm.subMap(null, objArray[9].toString());
            fail("NullPointerException expected");
        } catch (NullPointerException e) {
            //expected
        }
    }

    /**
     * @tests java.util.TreeMap#tailMap(java.lang.Object)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "tailMap",
        args = {java.lang.Object.class}
    )
    public void test_tailMapLjava_lang_Object() {
        // Test for method java.util.SortedMap
        // java.util.TreeMap.tailMap(java.lang.Object)
        Map tail = tm.tailMap(objArray[900].toString());
        assertTrue("Returned map of incorrect size : " + tail.size(), tail
                .size() == (objArray.length - 900) + 9);
        for (int i = 900; i < objArray.length; i++) {
            assertTrue("Map contains incorrect entries", tail
                    .containsValue(objArray[i]));
        }

        SortedMap sort = tm.tailMap("99");

        try {
            sort.tailMap("101");
            fail("IllegalArgumentException expected");
        } catch (IllegalArgumentException e) {
            //expected
        }

        try {
            tm.tailMap(this);
            fail("ClassCastException expected");
        } catch (ClassCastException e) {
            //expected
        }

        try {
            tm.tailMap(null);
            fail("NullPointerException expected");
        } catch (NullPointerException e) {
            //expected
        }

        // Regression for Harmony-1066
        assertTrue(tail instanceof Serializable);
    }

    /**
     * @tests java.util.TreeMap#values()
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "values",
        args = {}
    )
    public void test_values() {
        // Test for method java.util.Collection java.util.TreeMap.values()
        Collection vals = tm.values();
        vals.iterator();
        assertTrue("Returned collection of incorrect size",
                vals.size() == objArray.length);
        for (Object element : objArray) {
            assertTrue("Collection contains incorrect elements", vals
                    .contains(element));
        }

        TreeMap myTreeMap = new TreeMap();
        for (int i = 0; i < 100; i++) {
            myTreeMap.put(objArray[i], objArray[i]);
        }
        Collection values = myTreeMap.values();
        new Support_UnmodifiableCollectionTest(
                "Test Returned Collection From TreeMap.values()", values)
                .runTest();
        values.remove(new Integer(0));
        assertTrue(
                "Removing from the values collection should remove from the original map",
                !myTreeMap.containsValue(new Integer(0)));
    }

    /**
     * @tests java.util.TreeMap#SerializationTest()
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "Verifies serialization/deserialization.",
        method = "!SerializationSelf",
        args = {}
    )
    @AndroidOnly("fail on RI. See comment below")
    // Regression for Harmony-1066
    public void test_SubMap_Serializable() throws Exception {
        TreeMap<Integer, Double> map = new TreeMap<Integer, Double>();
        map.put(1, 2.1);
        map.put(2, 3.1);
        map.put(3, 4.5);
        map.put(7, 21.3);
        SortedMap<Integer, Double> headMap = map.headMap(3);
        assertTrue(headMap instanceof Serializable);
        assertFalse(headMap instanceof TreeMap);
        assertTrue(headMap instanceof SortedMap);

        assertFalse(headMap.entrySet() instanceof Serializable);
        assertFalse(headMap.keySet() instanceof Serializable);
        assertFalse(headMap.values() instanceof Serializable);

        // This assertion will fail on RI. This is a bug of RI.
        SerializationTest.verifySelf(headMap);
    }

    /**
     * Tests equals() method.
     * Tests that no ClassCastException will be thrown in all cases.
     * Regression test for HARMONY-1639.
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "equals",
        args = {java.lang.Object.class}
    )
    public void test_equals() throws Exception {
        // comparing TreeMaps with different object types
        Map m1 = new TreeMap();
        Map m2 = new TreeMap();
        m1.put("key1", "val1");
        m1.put("key2", "val2");
        m2.put(new Integer(1), "val1");
        m2.put(new Integer(2), "val2");
        assertFalse("Maps should not be equal 1", m1.equals(m2));
        assertFalse("Maps should not be equal 2", m2.equals(m1));

        // comparing TreeMap with HashMap
        m1 = new TreeMap();
        m2 = new HashMap();
        m1.put("key", "val");
        m2.put(new Object(), "val");
        assertFalse("Maps should not be equal 3", m1.equals(m2));
        assertFalse("Maps should not be equal 4", m2.equals(m1));

        // comparing TreeMaps with not-comparable objects inside
        m1 = new TreeMap();
        m2 = new TreeMap();
        m1.put(new Object(), "val1");
        m2.put(new Object(), "val1");
        assertFalse("Maps should not be equal 5", m1.equals(m2));
        assertFalse("Maps should not be equal 6", m2.equals(m1));
    }

    /**
     * Sets up the fixture, for example, open a network connection. This method
     * is called before a test is executed.
     */
    @Override
    protected void setUp() {
        tm = new TreeMap();
        for (int i = 0; i < objArray.length; i++) {
            Object x = objArray[i] = new Integer(i);
            tm.put(x.toString(), x);
        }
    }

}