util/Collections/EmptyNavigableMap.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.emptyNavigableMap
 * @run testng EmptyNavigableMap
 */
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.NavigableMap;
import java.util.SortedMap;
import java.util.TreeMap;

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

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

public class EmptyNavigableMap {

    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 assertEmptyNavigableMap(Object obj) {
        assertInstance(obj, NavigableMap.class);
        assertTrue(((NavigableMap)obj).isEmpty() && (((NavigableMap)obj).size() == 0));
    }

    public static <T extends Throwable> void assertEmptyNavigableMap(Object obj, String message) {
        assertInstance(obj, NavigableMap.class, message);
        assertTrue(((NavigableMap)obj).isEmpty() && (((NavigableMap)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);
    }

    public static final boolean isDescending(SortedMap<?,?> 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 = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
    public void testComparatorIsNull(String description, NavigableMap<?,?> navigableMap) {
        Comparator comparator = navigableMap.comparator();

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

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

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

    /**
     * Tests that the containsAll method returns {@code false}.
     */
    @Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
    public void testContainsAll(String description, NavigableMap<?,?> navigableMap) {
        TreeMap treeMap = new TreeMap();
        treeMap.put("1", 1);
        treeMap.put("2", 2);
        treeMap.put("3", 3);

        assertFalse(navigableMap.equals(treeMap), "Should not contain any elements.");
    }

    /**
     * Tests that the iterator is empty.
     */
    @Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
    public void testEmptyIterator(String description, NavigableMap<?,?> navigableMap) {
        assertFalse(navigableMap.keySet().iterator().hasNext(), "The iterator is not empty.");
        assertFalse(navigableMap.values().iterator().hasNext(), "The iterator is not empty.");
        assertFalse(navigableMap.entrySet().iterator().hasNext(), "The iterator is not empty.");
    }

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

    /**
     * Tests the headMap() method.
     */
    @Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
    public void testHeadMap(String description, NavigableMap navigableMap) {
        assertThrowsNPE(
            () -> { NavigableMap ss = navigableMap.headMap(null, false); },
            description + ": Must throw NullPointerException for null element");

        assertThrowsCCE(
            () -> { NavigableMap ss = navigableMap.headMap(new Object(), true); },
            description + ": Must throw ClassCastException for non-Comparable element");

        NavigableMap ss = navigableMap.headMap("1", false);

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

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

    /**
     * Tests the subMap() method.
     */
    @Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
    public void testSubMap(String description, NavigableMap navigableMap) {
        assertThrowsNPE(
            () -> {
                SortedMap ss = navigableMap.subMap(null, BigInteger.TEN);
            },
            description + ": Must throw NullPointerException for null element");

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

        assertThrowsNPE(
            () -> {
                SortedMap ss = navigableMap.subMap(null, null);
            },
            description + ": Must throw NullPointerException for null element");

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

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

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

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

        // minimal range
        navigableMap.subMap(BigInteger.ZERO, false, BigInteger.ZERO, false);
        navigableMap.subMap(BigInteger.ZERO, false, BigInteger.ZERO, true);
        navigableMap.subMap(BigInteger.ZERO, true, BigInteger.ZERO, false);
        navigableMap.subMap(BigInteger.ZERO, true, BigInteger.ZERO, true);

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

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

        navigableMap.subMap(first, true, last, false);
    }

    @Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
    public void testSubMapRanges(String description, NavigableMap navigableMap) {
        Object first = isDescending(navigableMap) ? BigInteger.TEN : BigInteger.ZERO;
        Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;

        NavigableMap subMap = navigableMap.subMap(first, true, last, true);

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

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

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

    @Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
    public void testheadMapRanges(String description, NavigableMap navigableMap) {
        NavigableMap subMap = navigableMap.headMap(BigInteger.ONE, true);

        // same subset
        subMap.headMap(BigInteger.ONE, true);

        // slightly smaller
        NavigableMap ns = subMap.headMap(BigInteger.ONE, false);

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

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

    @Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
    public void testTailMapRanges(String description, NavigableMap navigableMap) {
        NavigableMap subMap = navigableMap.tailMap(BigInteger.ONE, true);

        // same subset
        subMap.tailMap(BigInteger.ONE, true);

        // slightly smaller
        NavigableMap ns = subMap.tailMap(BigInteger.ONE, false);

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

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

    /**
     * Tests the tailMap() method.
     */
    @Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
    public void testTailMap(String description, NavigableMap navigableMap) {
        assertThrowsNPE(
            () -> navigableMap.tailMap(null),
            description + ": Must throw NullPointerException for null element");

        assertThrowsCCE(
            () -> navigableMap.tailMap(new Object()),
            description);

        NavigableMap ss = navigableMap.tailMap("1", true);

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

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

    public static Collection<Object[]> makeNavigableMaps() {
        return Arrays.asList(
            new Object[]{"UnmodifiableNavigableMap(TreeMap)", Collections.unmodifiableNavigableMap(new TreeMap())},
            new Object[]{"UnmodifiableNavigableMap(TreeMap.descendingMap()", Collections.unmodifiableNavigableMap(new TreeMap().descendingMap())},
            new Object[]{"UnmodifiableNavigableMap(TreeMap.descendingMap().descendingMap()", Collections.unmodifiableNavigableMap(new TreeMap().descendingMap().descendingMap())},
            new Object[]{"emptyNavigableMap()", Collections.emptyNavigableMap()},
            new Object[]{"emptyNavigableMap().descendingMap()", Collections.emptyNavigableMap().descendingMap()},
            new Object[]{"emptyNavigableMap().descendingMap().descendingMap()", Collections.emptyNavigableMap().descendingMap().descendingMap()}
        );
    }
}
Revision:	1.8
Committed:	Sun Jan 7 23:46:17 2018 UTC (6 years, 4 months ago) by jsr166
Branch:	MAIN
Changes since 1.7:	+13 -21 lines
Log Message:	prefer expression lambdas
#	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.emptyNavigableMap
28			* @run testng EmptyNavigableMap
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.NavigableMap;
37			import java.util.SortedMap;
38			import java.util.TreeMap;
39	jsr166	1.6
40			import org.testng.Assert;
41			import org.testng.Assert.ThrowingRunnable;
42	jsr166	1.1	import org.testng.annotations.Test;
43			import org.testng.annotations.DataProvider;
44
45			import static org.testng.Assert.assertTrue;
46			import static org.testng.Assert.assertFalse;
47
48			public class EmptyNavigableMap {
49
50			public static <T> void assertInstance(T actual, Class<? extends T> expected) {
51	jsr166	1.7	assertInstance(actual, expected, null);
52	jsr166	1.1	}
53
54			public static <T> void assertInstance(T actual, Class<? extends T> expected, String message) {
55			assertTrue(expected.isInstance(actual), ((null != message) ? message : "")
56			+ " " + (actual == null ? "<null>" : actual.getClass().getSimpleName()) + " != " + expected.getSimpleName() + ". ");
57			}
58
59			public static <T extends Throwable> void assertEmptyNavigableMap(Object obj) {
60			assertInstance(obj, NavigableMap.class);
61			assertTrue(((NavigableMap)obj).isEmpty() && (((NavigableMap)obj).size() == 0));
62			}
63
64			public static <T extends Throwable> void assertEmptyNavigableMap(Object obj, String message) {
65			assertInstance(obj, NavigableMap.class, message);
66			assertTrue(((NavigableMap)obj).isEmpty() && (((NavigableMap)obj).size() == 0),
67			((null != message) ? message : "") + " Not empty. ");
68			}
69
70	jsr166	1.6	private <T extends Throwable> void assertThrows(Class<T> throwableClass,
71			ThrowingRunnable runnable,
72			String message) {
73			try {
74			Assert.assertThrows(throwableClass, runnable);
75			} catch (AssertionError e) {
76			throw new AssertionError(String.format("%s%n%s",
77			((null != message) ? message : ""), e.getMessage()), e);
78			}
79			}
80	jsr166	1.1
81	jsr166	1.6	private void assertThrowsCCE(ThrowingRunnable r, String s) {
82			assertThrows(ClassCastException.class, r, s);
83	jsr166	1.1	}
84
85	jsr166	1.6	private void assertThrowsNPE(ThrowingRunnable r, String s) {
86			assertThrows(NullPointerException.class, r, s);
87	jsr166	1.1	}
88
89	jsr166	1.6	private void assertThrowsIAE(ThrowingRunnable r, String s) {
90			assertThrows(IllegalArgumentException.class, r, s);
91	jsr166	1.1	}
92
93			public static final boolean isDescending(SortedMap<?,?> set) {
94			if (null == set.comparator()) {
95			// natural order
96			return false;
97			}
98
99			if (Collections.reverseOrder() == set.comparator()) {
100			// reverse natural order.
101			return true;
102			}
103
104			if (set.comparator().equals(Collections.reverseOrder(Collections.reverseOrder(set.comparator())))) {
105			// it's a Collections.reverseOrder(Comparator).
106			return true;
107			}
108
109			throw new IllegalStateException("can't determine ordering for " + set);
110			}
111
112			/**
113			* Tests that the comparator is {@code null}.
114			*/
115			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
116			public void testComparatorIsNull(String description, NavigableMap<?,?> navigableMap) {
117			Comparator comparator = navigableMap.comparator();
118
119			assertTrue(comparator == null \|\| comparator == Collections.reverseOrder(), description + ": Comparator (" + comparator + ") is not null.");
120			}
121
122			/**
123			* Tests that contains requires Comparable
124			*/
125			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
126			public void testContainsRequiresComparable(String description, NavigableMap<?,?> navigableMap) {
127	jsr166	1.8	assertThrowsCCE(
128			() -> navigableMap.containsKey(new Object()),
129	jsr166	1.6	description + ": Compareable should be required");
130	jsr166	1.1	}
131
132			/**
133			* Tests that the contains method returns {@code false}.
134			*/
135			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
136			public void testContains(String description, NavigableMap<?,?> navigableMap) {
137			assertFalse(navigableMap.containsKey(new Integer(1)),
138			description + ": Should not contain any elements.");
139			assertFalse(navigableMap.containsValue(new Integer(1)),
140			description + ": Should not contain any elements.");
141			}
142
143			/**
144			* Tests that the containsAll method returns {@code false}.
145			*/
146			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
147			public void testContainsAll(String description, NavigableMap<?,?> navigableMap) {
148			TreeMap treeMap = new TreeMap();
149			treeMap.put("1", 1);
150			treeMap.put("2", 2);
151			treeMap.put("3", 3);
152
153			assertFalse(navigableMap.equals(treeMap), "Should not contain any elements.");
154			}
155
156			/**
157			* Tests that the iterator is empty.
158			*/
159			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
160			public void testEmptyIterator(String description, NavigableMap<?,?> navigableMap) {
161			assertFalse(navigableMap.keySet().iterator().hasNext(), "The iterator is not empty.");
162			assertFalse(navigableMap.values().iterator().hasNext(), "The iterator is not empty.");
163			assertFalse(navigableMap.entrySet().iterator().hasNext(), "The iterator is not empty.");
164			}
165
166			/**
167			* Tests that the set is empty.
168			*/
169			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
170			public void testIsEmpty(String description, NavigableMap<?,?> navigableMap) {
171			assertTrue(navigableMap.isEmpty(), "The set is not empty.");
172			}
173
174			/**
175			* Tests the headMap() method.
176			*/
177			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
178			public void testHeadMap(String description, NavigableMap navigableMap) {
179	jsr166	1.6	assertThrowsNPE(
180	jsr166	1.1	() -> { NavigableMap ss = navigableMap.headMap(null, false); },
181			description + ": Must throw NullPointerException for null element");
182
183	jsr166	1.6	assertThrowsCCE(
184	jsr166	1.1	() -> { NavigableMap ss = navigableMap.headMap(new Object(), true); },
185			description + ": Must throw ClassCastException for non-Comparable element");
186
187			NavigableMap ss = navigableMap.headMap("1", false);
188
189			assertEmptyNavigableMap(ss, description + ": Returned value is not empty navigable set.");
190			}
191
192			/**
193			* Tests that the size is 0.
194			*/
195			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
196			public void testSizeIsZero(String description, NavigableMap<?,?> navigableMap) {
197			assertTrue(0 == navigableMap.size(), "The size of the set is not 0.");
198			}
199
200			/**
201			* Tests the subMap() method.
202			*/
203			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
204			public void testSubMap(String description, NavigableMap navigableMap) {
205	jsr166	1.6	assertThrowsNPE(
206	jsr166	1.1	() -> {
207			SortedMap ss = navigableMap.subMap(null, BigInteger.TEN);
208			},
209			description + ": Must throw NullPointerException for null element");
210
211	jsr166	1.6	assertThrowsNPE(
212	jsr166	1.1	() -> {
213			SortedMap ss = navigableMap.subMap(BigInteger.ZERO, null);
214			},
215			description + ": Must throw NullPointerException for null element");
216
217	jsr166	1.6	assertThrowsNPE(
218	jsr166	1.1	() -> {
219			SortedMap ss = navigableMap.subMap(null, null);
220			},
221			description + ": Must throw NullPointerException for null element");
222
223			Object obj1 = new Object();
224			Object obj2 = new Object();
225
226	jsr166	1.6	assertThrowsCCE(
227	jsr166	1.1	() -> {
228			SortedMap ss = navigableMap.subMap(obj1, BigInteger.TEN);
229			},
230	jsr166	1.6	description + ": Must throw ClassCastException for parameter which is not Comparable.");
231	jsr166	1.1
232	jsr166	1.6	assertThrowsCCE(
233	jsr166	1.1	() -> {
234			SortedMap ss = navigableMap.subMap(BigInteger.ZERO, obj2);
235			},
236	jsr166	1.6	description + ": Must throw ClassCastException for parameter which is not Comparable.");
237	jsr166	1.1
238	jsr166	1.6	assertThrowsCCE(
239	jsr166	1.1	() -> {
240			SortedMap ss = navigableMap.subMap(obj1, obj2);
241			},
242	jsr166	1.6	description + ": Must throw ClassCastException for parameter which is not Comparable.");
243	jsr166	1.1
244			// minimal range
245			navigableMap.subMap(BigInteger.ZERO, false, BigInteger.ZERO, false);
246			navigableMap.subMap(BigInteger.ZERO, false, BigInteger.ZERO, true);
247			navigableMap.subMap(BigInteger.ZERO, true, BigInteger.ZERO, false);
248			navigableMap.subMap(BigInteger.ZERO, true, BigInteger.ZERO, true);
249
250			Object first = isDescending(navigableMap) ? BigInteger.TEN : BigInteger.ZERO;
251			Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;
252
253	jsr166	1.6	assertThrowsIAE(
254	jsr166	1.8	() -> navigableMap.subMap(last, true, first, false),
255	jsr166	1.6	description + ": Must throw IllegalArgumentException when fromElement is not less than toElement.");
256	jsr166	1.1
257			navigableMap.subMap(first, true, last, false);
258			}
259
260			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
261			public void testSubMapRanges(String description, NavigableMap navigableMap) {
262			Object first = isDescending(navigableMap) ? BigInteger.TEN : BigInteger.ZERO;
263			Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;
264
265			NavigableMap subMap = navigableMap.subMap(first, true, last, true);
266
267			// same subset
268			subMap.subMap(first, true, last, true);
269
270			// slightly smaller
271			NavigableMap ns = subMap.subMap(first, false, last, false);
272	jsr166	1.2	// slight expansion
273	jsr166	1.8	assertThrowsIAE(
274			() -> ns.subMap(first, true, last, true),
275	jsr166	1.1	description + ": Expansion should not be allowed");
276
277			// much smaller
278			subMap.subMap(first, false, BigInteger.ONE, false);
279			}
280
281			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
282			public void testheadMapRanges(String description, NavigableMap navigableMap) {
283			NavigableMap subMap = navigableMap.headMap(BigInteger.ONE, true);
284
285			// same subset
286			subMap.headMap(BigInteger.ONE, true);
287
288			// slightly smaller
289			NavigableMap ns = subMap.headMap(BigInteger.ONE, false);
290
291	jsr166	1.2	// slight expansion
292	jsr166	1.8	assertThrowsIAE(
293			() -> ns.headMap(BigInteger.ONE, true),
294	jsr166	1.1	description + ": Expansion should not be allowed");
295
296			// much smaller
297			subMap.headMap(isDescending(subMap) ? BigInteger.TEN : BigInteger.ZERO, true);
298			}
299
300			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
301			public void testTailMapRanges(String description, NavigableMap navigableMap) {
302			NavigableMap subMap = navigableMap.tailMap(BigInteger.ONE, true);
303
304			// same subset
305			subMap.tailMap(BigInteger.ONE, true);
306
307			// slightly smaller
308			NavigableMap ns = subMap.tailMap(BigInteger.ONE, false);
309
310	jsr166	1.2	// slight expansion
311	jsr166	1.8	assertThrowsIAE(
312			() -> ns.tailMap(BigInteger.ONE, true),
313	jsr166	1.1	description + ": Expansion should not be allowed");
314
315			// much smaller
316			subMap.tailMap(isDescending(subMap) ? BigInteger.ZERO : BigInteger.TEN, false);
317			}
318
319			/**
320			* Tests the tailMap() method.
321			*/
322			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
323			public void testTailMap(String description, NavigableMap navigableMap) {
324	jsr166	1.8	assertThrowsNPE(
325			() -> navigableMap.tailMap(null),
326	jsr166	1.1	description + ": Must throw NullPointerException for null element");
327
328	jsr166	1.8	assertThrowsCCE(
329			() -> navigableMap.tailMap(new Object()),
330	jsr166	1.6	description);
331	jsr166	1.1
332			NavigableMap ss = navigableMap.tailMap("1", true);
333
334			assertEmptyNavigableMap(ss, description + ": Returned value is not empty navigable set.");
335			}
336
337			@DataProvider(name = "NavigableMap<?,?>", parallel = true)
338			public static Iterator<Object[]> navigableMapsProvider() {
339			return makeNavigableMaps().iterator();
340			}
341
342			public static Collection<Object[]> makeNavigableMaps() {
343			return Arrays.asList(
344			new Object[]{"UnmodifiableNavigableMap(TreeMap)", Collections.unmodifiableNavigableMap(new TreeMap())},
345			new Object[]{"UnmodifiableNavigableMap(TreeMap.descendingMap()", Collections.unmodifiableNavigableMap(new TreeMap().descendingMap())},
346			new Object[]{"UnmodifiableNavigableMap(TreeMap.descendingMap().descendingMap()", Collections.unmodifiableNavigableMap(new TreeMap().descendingMap().descendingMap())},
347			new Object[]{"emptyNavigableMap()", Collections.emptyNavigableMap()},
348			new Object[]{"emptyNavigableMap().descendingMap()", Collections.emptyNavigableMap().descendingMap()},
349			new Object[]{"emptyNavigableMap().descendingMap().descendingMap()", Collections.emptyNavigableMap().descendingMap().descendingMap()}
350			);
351			}
352			}