util/Collections/EmptyNavigableSet.java

/*
 * Copyright (c) 2011, 2017, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * @test
 * @bug 4533691 7129185
 * @summary Unit test for Collections.emptyNavigableSet
 * @run testng EmptyNavigableSet
 */

import org.testng.Assert;
import org.testng.Assert.ThrowingRunnable;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

import java.math.BigInteger;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.NavigableSet;
import java.util.NoSuchElementException;
import java.util.SortedSet;
import java.util.TreeSet;

import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertNull;
import static org.testng.Assert.assertSame;
import static org.testng.Assert.assertTrue;

public class EmptyNavigableSet {

    public static <T> void assertInstance(T actual, Class<? extends T> expected) {
        assertInstance(actual, expected, null);
    }

    public static <T> void assertInstance(T actual, Class<? extends T> expected, String message) {
        assertTrue(expected.isInstance(actual), ((null != message) ? message : "")
            + " " + (actual == null ? "<null>" : actual.getClass().getSimpleName()) + " != " + expected.getSimpleName() + ". ");
    }

    public static <T extends Throwable> void assertEmptyNavigableSet(Object obj) {
        assertInstance(obj, NavigableSet.class);
        assertTrue(((NavigableSet)obj).isEmpty() && (((NavigableSet)obj).size() == 0));
    }

    public static <T extends Throwable> void assertEmptyNavigableSet(Object obj, String message) {
        assertInstance(obj, NavigableSet.class, message);
        assertTrue(((NavigableSet)obj).isEmpty() && (((NavigableSet)obj).size() == 0),
            ((null != message) ? message : "") + " Not empty. ");
    }

    private <T extends Throwable> void assertThrows(Class<T> throwableClass,
                                                    ThrowingRunnable runnable,
                                                    String message) {
        try {
            Assert.assertThrows(throwableClass, runnable);
        } catch (AssertionError e) {
            throw new AssertionError(String.format("%s%n%s",
                    ((null != message) ? message : ""), e.getMessage()), e);
        }
    }

    private void assertThrowsCCE(ThrowingRunnable r, String s) {
        assertThrows(ClassCastException.class, r, s);
    }

    private void assertThrowsNPE(ThrowingRunnable r, String s) {
        assertThrows(NullPointerException.class, r, s);
    }

    private void assertThrowsIAE(ThrowingRunnable r, String s) {
        assertThrows(IllegalArgumentException.class, r, s);
    }

    private void assertThrowsNSEE(ThrowingRunnable r, String s) {
        assertThrows(NoSuchElementException.class, r, s);
    }

    public static final boolean isDescending(SortedSet<?> set) {
        if (null == set.comparator()) {
            // natural order
            return false;
        }

        if (Collections.reverseOrder() == set.comparator()) {
            // reverse natural order.
            return true;
        }

        if (set.comparator().equals(Collections.reverseOrder(Collections.reverseOrder(set.comparator())))) {
            // it's a Collections.reverseOrder(Comparator).
            return true;
        }

        throw new IllegalStateException("can't determine ordering for " + set);
    }

    /**
     * Tests that the comparator is {@code null}.
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testComparatorIsNull(String description, NavigableSet<?> navigableSet) {
        Comparator comparator = navigableSet.comparator();

        assertTrue(comparator == null || comparator == Collections.reverseOrder(), description + ": Comparator (" + comparator + ") is not null.");
    }

    /**
     * Tests that contains requires Comparable
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testContainsRequiresComparable(String description, NavigableSet<?> navigableSet) {
        assertThrowsCCE(
            () -> navigableSet.contains(new Object()),
            description + ": Comparable should be required");
    }

    /**
     * Tests that the contains method returns {@code false}.
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testContains(String description, NavigableSet<?> navigableSet) {
        assertFalse(navigableSet.contains(new Integer(1)),
            description + ": Should not contain any elements.");
    }

    /**
     * Tests that the containsAll method returns {@code false}.
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testContainsAll(String description, NavigableSet<?> navigableSet) {
        TreeSet treeSet = new TreeSet();
        treeSet.add("1");
        treeSet.add("2");
        treeSet.add("3");

        assertFalse(navigableSet.containsAll(treeSet), "Should not contain any elements.");
    }

    /**
     * Tests that the iterator is empty.
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testEmptyIterator(String description, NavigableSet<?> navigableSet) {
        assertFalse(navigableSet.iterator().hasNext(), "The iterator is not empty.");
    }

    /**
     * Tests that the set is empty.
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testIsEmpty(String description, NavigableSet<?> navigableSet) {
        assertTrue(navigableSet.isEmpty(), "The set is not empty.");
    }

    /**
     * Tests that the first() method throws NoSuchElementException
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testFirst(String description, NavigableSet<?> navigableSet) {
        assertThrowsNSEE(navigableSet::first, description);
    }

    /**
     * Tests the headSet() method.
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testHeadSet(String description, NavigableSet navigableSet) {
        assertThrowsNPE(
            () -> { NavigableSet ns = navigableSet.headSet(null, false); },
            description + ": Must throw NullPointerException for null element");

        assertThrowsCCE(
            () -> { NavigableSet ns = navigableSet.headSet(new Object(), true); },
            description + ": Must throw ClassCastException for non-Comparable element");

        NavigableSet ns = navigableSet.headSet("1", false);

        assertEmptyNavigableSet(ns, description + ": Returned value is not empty navigable set.");
    }

    /**
     * Tests that the last() method throws NoSuchElementException
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testLast(String description, NavigableSet<?> navigableSet) {
        assertThrowsNSEE(navigableSet::last, description);
    }

    /**
     * Tests that the size is 0.
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testSizeIsZero(String description, NavigableSet<?> navigableSet) {
        assertTrue(0 == navigableSet.size(), "The size of the set is not 0.");
    }

    /**
     * Tests the subSet() method.
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testSubSet(String description, NavigableSet navigableSet) {
        assertThrowsNPE(
            () -> {
                SortedSet ss = navigableSet.subSet(null, BigInteger.TEN);
            },
            description + ": Must throw NullPointerException for null element");

        assertThrowsNPE(
            () -> {
                SortedSet ss = navigableSet.subSet(BigInteger.ZERO, null);
            },
            description + ": Must throw NullPointerException for null element");

        assertThrowsNPE(
            () -> {
                SortedSet ss = navigableSet.subSet(null, null);
            },
            description + ": Must throw NullPointerException for null element");

        Object obj1 = new Object();
        Object obj2 = new Object();

        assertThrowsCCE(
            () -> {
                SortedSet ss = navigableSet.subSet(obj1, BigInteger.TEN);
            },
            description + ": Must throw ClassCastException for parameter which is not Comparable.");

        assertThrowsCCE(
            () -> {
                SortedSet ss = navigableSet.subSet(BigInteger.ZERO, obj2);
            },
            description + ": Must throw ClassCastException for parameter which is not Comparable.");

        assertThrowsCCE(
            () -> {
                SortedSet ss = navigableSet.subSet(obj1, obj2);
            },
            description + ": Must throw ClassCastException for parameter which is not Comparable.");

        // minimal range
        navigableSet.subSet(BigInteger.ZERO, false, BigInteger.ZERO, false);
        navigableSet.subSet(BigInteger.ZERO, false, BigInteger.ZERO, true);
        navigableSet.subSet(BigInteger.ZERO, true, BigInteger.ZERO, false);
        navigableSet.subSet(BigInteger.ZERO, true, BigInteger.ZERO, true);

        Object first = isDescending(navigableSet) ? BigInteger.TEN : BigInteger.ZERO;
        Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;

            assertThrowsIAE(
                () -> navigableSet.subSet(last, true, first, false),
                description
                + ": Must throw IllegalArgumentException when fromElement is not less than toElement.");

        navigableSet.subSet(first, true, last, false);
    }

    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testSubSetRanges(String description, NavigableSet navigableSet) {
        Object first = isDescending(navigableSet) ? BigInteger.TEN : BigInteger.ZERO;
        Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;

        NavigableSet subSet = navigableSet.subSet(first, true, last, true);

        // same subset
        subSet.subSet(first, true, last, true);

        // slightly smaller
        NavigableSet ns = subSet.subSet(first, false, last, false);
        // slight expansion
        assertThrowsIAE(
            () -> ns.subSet(first, true, last, true),
            description + ": Expansion should not be allowed");

        // much smaller
        subSet.subSet(first, false, BigInteger.ONE, false);
    }

    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testheadSetRanges(String description, NavigableSet navigableSet) {
        NavigableSet subSet = navigableSet.headSet(BigInteger.ONE, true);

        // same subset
        subSet.headSet(BigInteger.ONE, true);

        // slightly smaller
        NavigableSet ns = subSet.headSet(BigInteger.ONE, false);

        // slight expansion
        assertThrowsIAE(
            () -> ns.headSet(BigInteger.ONE, true),
            description + ": Expansion should not be allowed");

        // much smaller
        subSet.headSet(isDescending(subSet) ? BigInteger.TEN : BigInteger.ZERO, true);
    }

    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testTailSetRanges(String description, NavigableSet navigableSet) {
        NavigableSet subSet = navigableSet.tailSet(BigInteger.ONE, true);

        // same subset
        subSet.tailSet(BigInteger.ONE, true);

        // slightly smaller
        NavigableSet ns = subSet.tailSet(BigInteger.ONE, false);

        // slight expansion
        assertThrowsIAE(
            () -> ns.tailSet(BigInteger.ONE, true),
            description + ": Expansion should not be allowed");

        // much smaller
        subSet.tailSet(isDescending(subSet) ? BigInteger.ZERO : BigInteger.TEN, false);
    }

    /**
     * Tests the tailSet() method.
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testTailSet(String description, NavigableSet navigableSet) {
        assertThrowsNPE(
            () -> navigableSet.tailSet(null),
            description + ": Must throw NullPointerException for null element");

        assertThrowsCCE(
            () -> navigableSet.tailSet(new Object()),
            description);

        NavigableSet ss = navigableSet.tailSet("1", true);

        assertEmptyNavigableSet(ss, description + ": Returned value is not empty navigable set.");
    }

    /**
     * Tests that the array has a size of 0.
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testToArray(String description, NavigableSet<?> navigableSet) {
        Object[] emptyNavigableSetArray = navigableSet.toArray();

        assertTrue(emptyNavigableSetArray.length == 0, "Returned non-empty Array.");

        emptyNavigableSetArray = new Object[20];

        Object[] result = navigableSet.toArray(emptyNavigableSetArray);

        assertSame(emptyNavigableSetArray, result);

        assertNull(result[0]);
    }

    @DataProvider(name = "NavigableSet<?>", parallel = true)
    public static Iterator<Object[]> navigableSetsProvider() {
        return makeNavigableSets().iterator();
    }

    public static Collection<Object[]> makeNavigableSets() {
        return Arrays.asList(
            new Object[]{"UnmodifiableNavigableSet(TreeSet)", Collections.unmodifiableNavigableSet(new TreeSet())},
            new Object[]{"UnmodifiableNavigableSet(TreeSet.descendingSet()", Collections.unmodifiableNavigableSet(new TreeSet().descendingSet())},
            new Object[]{"UnmodifiableNavigableSet(TreeSet.descendingSet().descendingSet()", Collections.unmodifiableNavigableSet(new TreeSet().descendingSet().descendingSet())},
            new Object[]{"emptyNavigableSet()", Collections.emptyNavigableSet()},
            new Object[]{"emptyNavigableSet().descendingSet()", Collections.emptyNavigableSet().descendingSet()},
            new Object[]{"emptyNavigableSet().descendingSet().descendingSet()", Collections.emptyNavigableSet().descendingSet().descendingSet()}
        );
    }
}
Revision:	1.14
Committed:	Mon Jul 23 01:11:22 2018 UTC (5 years, 9 months ago) by jsr166
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.13:	+1 -0 lines
Log Message:	fix imports
#	User	Rev	Content
1	jsr166	1.1	/*
2	jsr166	1.6	* Copyright (c) 2011, 2017, Oracle and/or its affiliates. All rights reserved.
3	jsr166	1.1	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4			*
5			* This code is free software; you can redistribute it and/or modify it
6			* under the terms of the GNU General Public License version 2 only, as
7			* published by the Free Software Foundation.
8			*
9			* This code is distributed in the hope that it will be useful, but WITHOUT
10			* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11			* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12			* version 2 for more details (a copy is included in the LICENSE file that
13			* accompanied this code).
14			*
15			* You should have received a copy of the GNU General Public License version
16			* 2 along with this work; if not, write to the Free Software Foundation,
17			* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18			*
19			* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20			* or visit www.oracle.com if you need additional information or have any
21			* questions.
22			*/
23
24			/*
25			* @test
26			* @bug 4533691 7129185
27			* @summary Unit test for Collections.emptyNavigableSet
28			* @run testng EmptyNavigableSet
29			*/
30	jsr166	1.11
31			import org.testng.Assert;
32			import org.testng.Assert.ThrowingRunnable;
33			import org.testng.annotations.DataProvider;
34			import org.testng.annotations.Test;
35
36	jsr166	1.1	import java.math.BigInteger;
37			import java.util.Arrays;
38			import java.util.Collection;
39			import java.util.Collections;
40			import java.util.Comparator;
41			import java.util.Iterator;
42	jsr166	1.11	import java.util.NavigableSet;
43	jsr166	1.1	import java.util.NoSuchElementException;
44			import java.util.SortedSet;
45			import java.util.TreeSet;
46	jsr166	1.6
47	jsr166	1.1	import static org.testng.Assert.assertFalse;
48	jsr166	1.14	import static org.testng.Assert.assertNull;
49	jsr166	1.1	import static org.testng.Assert.assertSame;
50	jsr166	1.4	import static org.testng.Assert.assertTrue;
51	jsr166	1.1
52			public class EmptyNavigableSet {
53
54			public static <T> void assertInstance(T actual, Class<? extends T> expected) {
55	jsr166	1.7	assertInstance(actual, expected, null);
56	jsr166	1.1	}
57
58			public static <T> void assertInstance(T actual, Class<? extends T> expected, String message) {
59			assertTrue(expected.isInstance(actual), ((null != message) ? message : "")
60			+ " " + (actual == null ? "<null>" : actual.getClass().getSimpleName()) + " != " + expected.getSimpleName() + ". ");
61			}
62
63			public static <T extends Throwable> void assertEmptyNavigableSet(Object obj) {
64			assertInstance(obj, NavigableSet.class);
65			assertTrue(((NavigableSet)obj).isEmpty() && (((NavigableSet)obj).size() == 0));
66			}
67
68			public static <T extends Throwable> void assertEmptyNavigableSet(Object obj, String message) {
69			assertInstance(obj, NavigableSet.class, message);
70			assertTrue(((NavigableSet)obj).isEmpty() && (((NavigableSet)obj).size() == 0),
71			((null != message) ? message : "") + " Not empty. ");
72			}
73
74	jsr166	1.6	private <T extends Throwable> void assertThrows(Class<T> throwableClass,
75			ThrowingRunnable runnable,
76			String message) {
77			try {
78			Assert.assertThrows(throwableClass, runnable);
79			} catch (AssertionError e) {
80			throw new AssertionError(String.format("%s%n%s",
81			((null != message) ? message : ""), e.getMessage()), e);
82			}
83			}
84	jsr166	1.1
85	jsr166	1.6	private void assertThrowsCCE(ThrowingRunnable r, String s) {
86			assertThrows(ClassCastException.class, r, s);
87	jsr166	1.1	}
88
89	jsr166	1.6	private void assertThrowsNPE(ThrowingRunnable r, String s) {
90			assertThrows(NullPointerException.class, r, s);
91	jsr166	1.1	}
92
93	jsr166	1.6	private void assertThrowsIAE(ThrowingRunnable r, String s) {
94			assertThrows(IllegalArgumentException.class, r, s);
95			}
96	jsr166	1.1
97	jsr166	1.6	private void assertThrowsNSEE(ThrowingRunnable r, String s) {
98			assertThrows(NoSuchElementException.class, r, s);
99	jsr166	1.1	}
100
101			public static final boolean isDescending(SortedSet<?> set) {
102			if (null == set.comparator()) {
103			// natural order
104			return false;
105			}
106
107			if (Collections.reverseOrder() == set.comparator()) {
108			// reverse natural order.
109			return true;
110			}
111
112			if (set.comparator().equals(Collections.reverseOrder(Collections.reverseOrder(set.comparator())))) {
113			// it's a Collections.reverseOrder(Comparator).
114			return true;
115			}
116
117			throw new IllegalStateException("can't determine ordering for " + set);
118			}
119
120			/**
121			* Tests that the comparator is {@code null}.
122			*/
123			@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
124			public void testComparatorIsNull(String description, NavigableSet<?> navigableSet) {
125			Comparator comparator = navigableSet.comparator();
126
127			assertTrue(comparator == null \|\| comparator == Collections.reverseOrder(), description + ": Comparator (" + comparator + ") is not null.");
128			}
129
130			/**
131			* Tests that contains requires Comparable
132			*/
133			@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
134			public void testContainsRequiresComparable(String description, NavigableSet<?> navigableSet) {
135	jsr166	1.9	assertThrowsCCE(
136			() -> navigableSet.contains(new Object()),
137	jsr166	1.10	description + ": Comparable should be required");
138	jsr166	1.1	}
139
140			/**
141			* Tests that the contains method returns {@code false}.
142			*/
143			@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
144			public void testContains(String description, NavigableSet<?> navigableSet) {
145			assertFalse(navigableSet.contains(new Integer(1)),
146			description + ": Should not contain any elements.");
147			}
148
149			/**
150			* Tests that the containsAll method returns {@code false}.
151			*/
152			@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
153			public void testContainsAll(String description, NavigableSet<?> navigableSet) {
154			TreeSet treeSet = new TreeSet();
155			treeSet.add("1");
156			treeSet.add("2");
157			treeSet.add("3");
158
159			assertFalse(navigableSet.containsAll(treeSet), "Should not contain any elements.");
160			}
161
162			/**
163			* Tests that the iterator is empty.
164			*/
165			@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
166			public void testEmptyIterator(String description, NavigableSet<?> navigableSet) {
167	jsr166	1.12	assertFalse(navigableSet.iterator().hasNext(), "The iterator is not empty.");
168	jsr166	1.1	}
169
170			/**
171			* Tests that the set is empty.
172			*/
173			@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
174			public void testIsEmpty(String description, NavigableSet<?> navigableSet) {
175			assertTrue(navigableSet.isEmpty(), "The set is not empty.");
176			}
177
178			/**
179			* Tests that the first() method throws NoSuchElementException
180			*/
181			@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
182			public void testFirst(String description, NavigableSet<?> navigableSet) {
183	jsr166	1.8	assertThrowsNSEE(navigableSet::first, description);
184	jsr166	1.1	}
185
186			/**
187			* Tests the headSet() method.
188			*/
189			@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
190			public void testHeadSet(String description, NavigableSet navigableSet) {
191	jsr166	1.6	assertThrowsNPE(
192	jsr166	1.1	() -> { NavigableSet ns = navigableSet.headSet(null, false); },
193			description + ": Must throw NullPointerException for null element");
194
195	jsr166	1.6	assertThrowsCCE(
196	jsr166	1.1	() -> { NavigableSet ns = navigableSet.headSet(new Object(), true); },
197			description + ": Must throw ClassCastException for non-Comparable element");
198
199			NavigableSet ns = navigableSet.headSet("1", false);
200
201			assertEmptyNavigableSet(ns, description + ": Returned value is not empty navigable set.");
202			}
203
204			/**
205			* Tests that the last() method throws NoSuchElementException
206			*/
207			@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
208			public void testLast(String description, NavigableSet<?> navigableSet) {
209	jsr166	1.8	assertThrowsNSEE(navigableSet::last, description);
210	jsr166	1.1	}
211
212			/**
213			* Tests that the size is 0.
214			*/
215			@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
216			public void testSizeIsZero(String description, NavigableSet<?> navigableSet) {
217			assertTrue(0 == navigableSet.size(), "The size of the set is not 0.");
218			}
219
220			/**
221			* Tests the subSet() method.
222			*/
223			@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
224			public void testSubSet(String description, NavigableSet navigableSet) {
225	jsr166	1.6	assertThrowsNPE(
226	jsr166	1.1	() -> {
227			SortedSet ss = navigableSet.subSet(null, BigInteger.TEN);
228			},
229			description + ": Must throw NullPointerException for null element");
230
231	jsr166	1.6	assertThrowsNPE(
232	jsr166	1.1	() -> {
233			SortedSet ss = navigableSet.subSet(BigInteger.ZERO, null);
234			},
235			description + ": Must throw NullPointerException for null element");
236
237	jsr166	1.6	assertThrowsNPE(
238	jsr166	1.1	() -> {
239			SortedSet ss = navigableSet.subSet(null, null);
240			},
241			description + ": Must throw NullPointerException for null element");
242
243			Object obj1 = new Object();
244			Object obj2 = new Object();
245
246	jsr166	1.6	assertThrowsCCE(
247	jsr166	1.1	() -> {
248			SortedSet ss = navigableSet.subSet(obj1, BigInteger.TEN);
249			},
250	jsr166	1.6	description + ": Must throw ClassCastException for parameter which is not Comparable.");
251	jsr166	1.1
252	jsr166	1.6	assertThrowsCCE(
253	jsr166	1.1	() -> {
254			SortedSet ss = navigableSet.subSet(BigInteger.ZERO, obj2);
255			},
256	jsr166	1.6	description + ": Must throw ClassCastException for parameter which is not Comparable.");
257	jsr166	1.1
258	jsr166	1.6	assertThrowsCCE(
259	jsr166	1.1	() -> {
260			SortedSet ss = navigableSet.subSet(obj1, obj2);
261			},
262	jsr166	1.6	description + ": Must throw ClassCastException for parameter which is not Comparable.");
263	jsr166	1.1
264			// minimal range
265			navigableSet.subSet(BigInteger.ZERO, false, BigInteger.ZERO, false);
266			navigableSet.subSet(BigInteger.ZERO, false, BigInteger.ZERO, true);
267			navigableSet.subSet(BigInteger.ZERO, true, BigInteger.ZERO, false);
268			navigableSet.subSet(BigInteger.ZERO, true, BigInteger.ZERO, true);
269
270			Object first = isDescending(navigableSet) ? BigInteger.TEN : BigInteger.ZERO;
271			Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;
272
273	jsr166	1.6	assertThrowsIAE(
274	jsr166	1.9	() -> navigableSet.subSet(last, true, first, false),
275	jsr166	1.6	description
276	jsr166	1.3	+ ": Must throw IllegalArgumentException when fromElement is not less than toElement.");
277	jsr166	1.1
278			navigableSet.subSet(first, true, last, false);
279			}
280
281			@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
282			public void testSubSetRanges(String description, NavigableSet navigableSet) {
283			Object first = isDescending(navigableSet) ? BigInteger.TEN : BigInteger.ZERO;
284			Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;
285
286			NavigableSet subSet = navigableSet.subSet(first, true, last, true);
287
288			// same subset
289			subSet.subSet(first, true, last, true);
290
291			// slightly smaller
292			NavigableSet ns = subSet.subSet(first, false, last, false);
293	jsr166	1.2	// slight expansion
294	jsr166	1.9	assertThrowsIAE(
295			() -> ns.subSet(first, true, last, true),
296	jsr166	1.1	description + ": Expansion should not be allowed");
297
298			// much smaller
299			subSet.subSet(first, false, BigInteger.ONE, false);
300			}
301
302			@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
303			public void testheadSetRanges(String description, NavigableSet navigableSet) {
304			NavigableSet subSet = navigableSet.headSet(BigInteger.ONE, true);
305
306			// same subset
307			subSet.headSet(BigInteger.ONE, true);
308
309			// slightly smaller
310			NavigableSet ns = subSet.headSet(BigInteger.ONE, false);
311
312	jsr166	1.2	// slight expansion
313	jsr166	1.9	assertThrowsIAE(
314			() -> ns.headSet(BigInteger.ONE, true),
315	jsr166	1.1	description + ": Expansion should not be allowed");
316
317			// much smaller
318			subSet.headSet(isDescending(subSet) ? BigInteger.TEN : BigInteger.ZERO, true);
319			}
320
321			@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
322			public void testTailSetRanges(String description, NavigableSet navigableSet) {
323			NavigableSet subSet = navigableSet.tailSet(BigInteger.ONE, true);
324
325			// same subset
326			subSet.tailSet(BigInteger.ONE, true);
327
328			// slightly smaller
329			NavigableSet ns = subSet.tailSet(BigInteger.ONE, false);
330
331	jsr166	1.2	// slight expansion
332	jsr166	1.9	assertThrowsIAE(
333			() -> ns.tailSet(BigInteger.ONE, true),
334	jsr166	1.1	description + ": Expansion should not be allowed");
335
336			// much smaller
337			subSet.tailSet(isDescending(subSet) ? BigInteger.ZERO : BigInteger.TEN, false);
338			}
339
340			/**
341			* Tests the tailSet() method.
342			*/
343			@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
344			public void testTailSet(String description, NavigableSet navigableSet) {
345	jsr166	1.9	assertThrowsNPE(
346			() -> navigableSet.tailSet(null),
347	jsr166	1.1	description + ": Must throw NullPointerException for null element");
348
349	jsr166	1.9	assertThrowsCCE(
350			() -> navigableSet.tailSet(new Object()),
351			description);
352	jsr166	1.1
353			NavigableSet ss = navigableSet.tailSet("1", true);
354
355			assertEmptyNavigableSet(ss, description + ": Returned value is not empty navigable set.");
356			}
357
358			/**
359			* Tests that the array has a size of 0.
360			*/
361			@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
362			public void testToArray(String description, NavigableSet<?> navigableSet) {
363			Object[] emptyNavigableSetArray = navigableSet.toArray();
364
365			assertTrue(emptyNavigableSetArray.length == 0, "Returned non-empty Array.");
366
367			emptyNavigableSetArray = new Object[20];
368
369			Object[] result = navigableSet.toArray(emptyNavigableSetArray);
370
371			assertSame(emptyNavigableSetArray, result);
372
373	jsr166	1.13	assertNull(result[0]);
374	jsr166	1.1	}
375
376			@DataProvider(name = "NavigableSet<?>", parallel = true)
377			public static Iterator<Object[]> navigableSetsProvider() {
378			return makeNavigableSets().iterator();
379			}
380
381			public static Collection<Object[]> makeNavigableSets() {
382			return Arrays.asList(
383			new Object[]{"UnmodifiableNavigableSet(TreeSet)", Collections.unmodifiableNavigableSet(new TreeSet())},
384			new Object[]{"UnmodifiableNavigableSet(TreeSet.descendingSet()", Collections.unmodifiableNavigableSet(new TreeSet().descendingSet())},
385			new Object[]{"UnmodifiableNavigableSet(TreeSet.descendingSet().descendingSet()", Collections.unmodifiableNavigableSet(new TreeSet().descendingSet().descendingSet())},
386			new Object[]{"emptyNavigableSet()", Collections.emptyNavigableSet()},
387			new Object[]{"emptyNavigableSet().descendingSet()", Collections.emptyNavigableSet().descendingSet()},
388			new Object[]{"emptyNavigableSet().descendingSet().descendingSet()", Collections.emptyNavigableSet().descendingSet().descendingSet()}
389			);
390			}
391			}