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 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.NoSuchElementException;
import java.util.NavigableSet;
import java.util.SortedSet;
import java.util.TreeSet;

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

import static org.testng.Assert.assertFalse;
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) {
        Iterator emptyIterator = navigableSet.iterator();

        assertFalse((emptyIterator != null) && (emptyIterator.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);

        assertTrue(result[0] == null);
    }

    @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:	1.10
Committed:	Sun Jan 7 23:48:13 2018 UTC (6 years, 4 months ago) by jsr166
Branch:	MAIN
Changes since 1.9:	+1 -1 lines
Log Message:	typo
#	Content
1	/*
2	* Copyright (c) 2011, 2017, Oracle and/or its affiliates. All rights reserved.
3	* 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	import java.math.BigInteger;
31	import java.util.Arrays;
32	import java.util.Collection;
33	import java.util.Collections;
34	import java.util.Comparator;
35	import java.util.Iterator;
36	import java.util.NoSuchElementException;
37	import java.util.NavigableSet;
38	import java.util.SortedSet;
39	import java.util.TreeSet;
40
41	import org.testng.Assert;
42	import org.testng.Assert.ThrowingRunnable;
43	import org.testng.annotations.Test;
44	import org.testng.annotations.DataProvider;
45
46	import static org.testng.Assert.assertFalse;
47	import static org.testng.Assert.assertSame;
48	import static org.testng.Assert.assertTrue;
49
50	public class EmptyNavigableSet {
51
52	public static <T> void assertInstance(T actual, Class<? extends T> expected) {
53	assertInstance(actual, expected, null);
54	}
55
56	public static <T> void assertInstance(T actual, Class<? extends T> expected, String message) {
57	assertTrue(expected.isInstance(actual), ((null != message) ? message : "")
58	+ " " + (actual == null ? "<null>" : actual.getClass().getSimpleName()) + " != " + expected.getSimpleName() + ". ");
59	}
60
61	public static <T extends Throwable> void assertEmptyNavigableSet(Object obj) {
62	assertInstance(obj, NavigableSet.class);
63	assertTrue(((NavigableSet)obj).isEmpty() && (((NavigableSet)obj).size() == 0));
64	}
65
66	public static <T extends Throwable> void assertEmptyNavigableSet(Object obj, String message) {
67	assertInstance(obj, NavigableSet.class, message);
68	assertTrue(((NavigableSet)obj).isEmpty() && (((NavigableSet)obj).size() == 0),
69	((null != message) ? message : "") + " Not empty. ");
70	}
71
72	private <T extends Throwable> void assertThrows(Class<T> throwableClass,
73	ThrowingRunnable runnable,
74	String message) {
75	try {
76	Assert.assertThrows(throwableClass, runnable);
77	} catch (AssertionError e) {
78	throw new AssertionError(String.format("%s%n%s",
79	((null != message) ? message : ""), e.getMessage()), e);
80	}
81	}
82
83	private void assertThrowsCCE(ThrowingRunnable r, String s) {
84	assertThrows(ClassCastException.class, r, s);
85	}
86
87	private void assertThrowsNPE(ThrowingRunnable r, String s) {
88	assertThrows(NullPointerException.class, r, s);
89	}
90
91	private void assertThrowsIAE(ThrowingRunnable r, String s) {
92	assertThrows(IllegalArgumentException.class, r, s);
93	}
94
95	private void assertThrowsNSEE(ThrowingRunnable r, String s) {
96	assertThrows(NoSuchElementException.class, r, s);
97	}
98
99	public static final boolean isDescending(SortedSet<?> set) {
100	if (null == set.comparator()) {
101	// natural order
102	return false;
103	}
104
105	if (Collections.reverseOrder() == set.comparator()) {
106	// reverse natural order.
107	return true;
108	}
109
110	if (set.comparator().equals(Collections.reverseOrder(Collections.reverseOrder(set.comparator())))) {
111	// it's a Collections.reverseOrder(Comparator).
112	return true;
113	}
114
115	throw new IllegalStateException("can't determine ordering for " + set);
116	}
117
118	/**
119	* Tests that the comparator is {@code null}.
120	*/
121	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
122	public void testComparatorIsNull(String description, NavigableSet<?> navigableSet) {
123	Comparator comparator = navigableSet.comparator();
124
125	assertTrue(comparator == null \|\| comparator == Collections.reverseOrder(), description + ": Comparator (" + comparator + ") is not null.");
126	}
127
128	/**
129	* Tests that contains requires Comparable
130	*/
131	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
132	public void testContainsRequiresComparable(String description, NavigableSet<?> navigableSet) {
133	assertThrowsCCE(
134	() -> navigableSet.contains(new Object()),
135	description + ": Comparable should be required");
136	}
137
138	/**
139	* Tests that the contains method returns {@code false}.
140	*/
141	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
142	public void testContains(String description, NavigableSet<?> navigableSet) {
143	assertFalse(navigableSet.contains(new Integer(1)),
144	description + ": Should not contain any elements.");
145	}
146
147	/**
148	* Tests that the containsAll method returns {@code false}.
149	*/
150	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
151	public void testContainsAll(String description, NavigableSet<?> navigableSet) {
152	TreeSet treeSet = new TreeSet();
153	treeSet.add("1");
154	treeSet.add("2");
155	treeSet.add("3");
156
157	assertFalse(navigableSet.containsAll(treeSet), "Should not contain any elements.");
158	}
159
160	/**
161	* Tests that the iterator is empty.
162	*/
163	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
164	public void testEmptyIterator(String description, NavigableSet<?> navigableSet) {
165	Iterator emptyIterator = navigableSet.iterator();
166
167	assertFalse((emptyIterator != null) && (emptyIterator.hasNext()),
168	"The iterator is not empty.");
169	}
170
171	/**
172	* Tests that the set is empty.
173	*/
174	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
175	public void testIsEmpty(String description, NavigableSet<?> navigableSet) {
176	assertTrue(navigableSet.isEmpty(), "The set is not empty.");
177	}
178
179	/**
180	* Tests that the first() method throws NoSuchElementException
181	*/
182	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
183	public void testFirst(String description, NavigableSet<?> navigableSet) {
184	assertThrowsNSEE(navigableSet::first, description);
185	}
186
187	/**
188	* Tests the headSet() method.
189	*/
190	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
191	public void testHeadSet(String description, NavigableSet navigableSet) {
192	assertThrowsNPE(
193	() -> { NavigableSet ns = navigableSet.headSet(null, false); },
194	description + ": Must throw NullPointerException for null element");
195
196	assertThrowsCCE(
197	() -> { NavigableSet ns = navigableSet.headSet(new Object(), true); },
198	description + ": Must throw ClassCastException for non-Comparable element");
199
200	NavigableSet ns = navigableSet.headSet("1", false);
201
202	assertEmptyNavigableSet(ns, description + ": Returned value is not empty navigable set.");
203	}
204
205	/**
206	* Tests that the last() method throws NoSuchElementException
207	*/
208	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
209	public void testLast(String description, NavigableSet<?> navigableSet) {
210	assertThrowsNSEE(navigableSet::last, description);
211	}
212
213	/**
214	* Tests that the size is 0.
215	*/
216	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
217	public void testSizeIsZero(String description, NavigableSet<?> navigableSet) {
218	assertTrue(0 == navigableSet.size(), "The size of the set is not 0.");
219	}
220
221	/**
222	* Tests the subSet() method.
223	*/
224	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
225	public void testSubSet(String description, NavigableSet navigableSet) {
226	assertThrowsNPE(
227	() -> {
228	SortedSet ss = navigableSet.subSet(null, BigInteger.TEN);
229	},
230	description + ": Must throw NullPointerException for null element");
231
232	assertThrowsNPE(
233	() -> {
234	SortedSet ss = navigableSet.subSet(BigInteger.ZERO, null);
235	},
236	description + ": Must throw NullPointerException for null element");
237
238	assertThrowsNPE(
239	() -> {
240	SortedSet ss = navigableSet.subSet(null, null);
241	},
242	description + ": Must throw NullPointerException for null element");
243
244	Object obj1 = new Object();
245	Object obj2 = new Object();
246
247	assertThrowsCCE(
248	() -> {
249	SortedSet ss = navigableSet.subSet(obj1, BigInteger.TEN);
250	},
251	description + ": Must throw ClassCastException for parameter which is not Comparable.");
252
253	assertThrowsCCE(
254	() -> {
255	SortedSet ss = navigableSet.subSet(BigInteger.ZERO, obj2);
256	},
257	description + ": Must throw ClassCastException for parameter which is not Comparable.");
258
259	assertThrowsCCE(
260	() -> {
261	SortedSet ss = navigableSet.subSet(obj1, obj2);
262	},
263	description + ": Must throw ClassCastException for parameter which is not Comparable.");
264
265	// minimal range
266	navigableSet.subSet(BigInteger.ZERO, false, BigInteger.ZERO, false);
267	navigableSet.subSet(BigInteger.ZERO, false, BigInteger.ZERO, true);
268	navigableSet.subSet(BigInteger.ZERO, true, BigInteger.ZERO, false);
269	navigableSet.subSet(BigInteger.ZERO, true, BigInteger.ZERO, true);
270
271	Object first = isDescending(navigableSet) ? BigInteger.TEN : BigInteger.ZERO;
272	Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;
273
274	assertThrowsIAE(
275	() -> navigableSet.subSet(last, true, first, false),
276	description
277	+ ": Must throw IllegalArgumentException when fromElement is not less than toElement.");
278
279	navigableSet.subSet(first, true, last, false);
280	}
281
282	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
283	public void testSubSetRanges(String description, NavigableSet navigableSet) {
284	Object first = isDescending(navigableSet) ? BigInteger.TEN : BigInteger.ZERO;
285	Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;
286
287	NavigableSet subSet = navigableSet.subSet(first, true, last, true);
288
289	// same subset
290	subSet.subSet(first, true, last, true);
291
292	// slightly smaller
293	NavigableSet ns = subSet.subSet(first, false, last, false);
294	// slight expansion
295	assertThrowsIAE(
296	() -> ns.subSet(first, true, last, true),
297	description + ": Expansion should not be allowed");
298
299	// much smaller
300	subSet.subSet(first, false, BigInteger.ONE, false);
301	}
302
303	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
304	public void testheadSetRanges(String description, NavigableSet navigableSet) {
305	NavigableSet subSet = navigableSet.headSet(BigInteger.ONE, true);
306
307	// same subset
308	subSet.headSet(BigInteger.ONE, true);
309
310	// slightly smaller
311	NavigableSet ns = subSet.headSet(BigInteger.ONE, false);
312
313	// slight expansion
314	assertThrowsIAE(
315	() -> ns.headSet(BigInteger.ONE, true),
316	description + ": Expansion should not be allowed");
317
318	// much smaller
319	subSet.headSet(isDescending(subSet) ? BigInteger.TEN : BigInteger.ZERO, true);
320	}
321
322	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
323	public void testTailSetRanges(String description, NavigableSet navigableSet) {
324	NavigableSet subSet = navigableSet.tailSet(BigInteger.ONE, true);
325
326	// same subset
327	subSet.tailSet(BigInteger.ONE, true);
328
329	// slightly smaller
330	NavigableSet ns = subSet.tailSet(BigInteger.ONE, false);
331
332	// slight expansion
333	assertThrowsIAE(
334	() -> ns.tailSet(BigInteger.ONE, true),
335	description + ": Expansion should not be allowed");
336
337	// much smaller
338	subSet.tailSet(isDescending(subSet) ? BigInteger.ZERO : BigInteger.TEN, false);
339	}
340
341	/**
342	* Tests the tailSet() method.
343	*/
344	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
345	public void testTailSet(String description, NavigableSet navigableSet) {
346	assertThrowsNPE(
347	() -> navigableSet.tailSet(null),
348	description + ": Must throw NullPointerException for null element");
349
350	assertThrowsCCE(
351	() -> navigableSet.tailSet(new Object()),
352	description);
353
354	NavigableSet ss = navigableSet.tailSet("1", true);
355
356	assertEmptyNavigableSet(ss, description + ": Returned value is not empty navigable set.");
357	}
358
359	/**
360	* Tests that the array has a size of 0.
361	*/
362	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
363	public void testToArray(String description, NavigableSet<?> navigableSet) {
364	Object[] emptyNavigableSetArray = navigableSet.toArray();
365
366	assertTrue(emptyNavigableSetArray.length == 0, "Returned non-empty Array.");
367
368	emptyNavigableSetArray = new Object[20];
369
370	Object[] result = navigableSet.toArray(emptyNavigableSetArray);
371
372	assertSame(emptyNavigableSetArray, result);
373
374	assertTrue(result[0] == null);
375	}
376
377	@DataProvider(name = "NavigableSet<?>", parallel = true)
378	public static Iterator<Object[]> navigableSetsProvider() {
379	return makeNavigableSets().iterator();
380	}
381
382	public static Collection<Object[]> makeNavigableSets() {
383	return Arrays.asList(
384	new Object[]{"UnmodifiableNavigableSet(TreeSet)", Collections.unmodifiableNavigableSet(new TreeSet())},
385	new Object[]{"UnmodifiableNavigableSet(TreeSet.descendingSet()", Collections.unmodifiableNavigableSet(new TreeSet().descendingSet())},
386	new Object[]{"UnmodifiableNavigableSet(TreeSet.descendingSet().descendingSet()", Collections.unmodifiableNavigableSet(new TreeSet().descendingSet().descendingSet())},
387	new Object[]{"emptyNavigableSet()", Collections.emptyNavigableSet()},
388	new Object[]{"emptyNavigableSet().descendingSet()", Collections.emptyNavigableSet().descendingSet()},
389	new Object[]{"emptyNavigableSet().descendingSet().descendingSet()", Collections.emptyNavigableSet().descendingSet().descendingSet()}
390	);
391	}
392	}