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 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.NavigableMap;
import java.util.SortedMap;
import java.util.TreeMap;

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

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 + ": Comparable 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:	1.10
Committed:	Mon Jan 8 03:12:03 2018 UTC (6 years, 4 months ago) by jsr166
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.9:	+7 -6 lines
Log Message:	organize 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.emptyNavigableMap
28			* @run testng EmptyNavigableMap
29			*/
30	jsr166	1.10
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			import java.util.NavigableMap;
43			import java.util.SortedMap;
44			import java.util.TreeMap;
45	jsr166	1.6
46	jsr166	1.10	import static org.testng.Assert.assertFalse;
47	jsr166	1.1	import static org.testng.Assert.assertTrue;
48
49			public class EmptyNavigableMap {
50
51			public static <T> void assertInstance(T actual, Class<? extends T> expected) {
52	jsr166	1.7	assertInstance(actual, expected, null);
53	jsr166	1.1	}
54
55			public static <T> void assertInstance(T actual, Class<? extends T> expected, String message) {
56			assertTrue(expected.isInstance(actual), ((null != message) ? message : "")
57			+ " " + (actual == null ? "<null>" : actual.getClass().getSimpleName()) + " != " + expected.getSimpleName() + ". ");
58			}
59
60			public static <T extends Throwable> void assertEmptyNavigableMap(Object obj) {
61			assertInstance(obj, NavigableMap.class);
62			assertTrue(((NavigableMap)obj).isEmpty() && (((NavigableMap)obj).size() == 0));
63			}
64
65			public static <T extends Throwable> void assertEmptyNavigableMap(Object obj, String message) {
66			assertInstance(obj, NavigableMap.class, message);
67			assertTrue(((NavigableMap)obj).isEmpty() && (((NavigableMap)obj).size() == 0),
68			((null != message) ? message : "") + " Not empty. ");
69			}
70
71	jsr166	1.6	private <T extends Throwable> void assertThrows(Class<T> throwableClass,
72			ThrowingRunnable runnable,
73			String message) {
74			try {
75			Assert.assertThrows(throwableClass, runnable);
76			} catch (AssertionError e) {
77			throw new AssertionError(String.format("%s%n%s",
78			((null != message) ? message : ""), e.getMessage()), e);
79			}
80			}
81	jsr166	1.1
82	jsr166	1.6	private void assertThrowsCCE(ThrowingRunnable r, String s) {
83			assertThrows(ClassCastException.class, r, s);
84	jsr166	1.1	}
85
86	jsr166	1.6	private void assertThrowsNPE(ThrowingRunnable r, String s) {
87			assertThrows(NullPointerException.class, r, s);
88	jsr166	1.1	}
89
90	jsr166	1.6	private void assertThrowsIAE(ThrowingRunnable r, String s) {
91			assertThrows(IllegalArgumentException.class, r, s);
92	jsr166	1.1	}
93
94			public static final boolean isDescending(SortedMap<?,?> set) {
95			if (null == set.comparator()) {
96			// natural order
97			return false;
98			}
99
100			if (Collections.reverseOrder() == set.comparator()) {
101			// reverse natural order.
102			return true;
103			}
104
105			if (set.comparator().equals(Collections.reverseOrder(Collections.reverseOrder(set.comparator())))) {
106			// it's a Collections.reverseOrder(Comparator).
107			return true;
108			}
109
110			throw new IllegalStateException("can't determine ordering for " + set);
111			}
112
113			/**
114			* Tests that the comparator is {@code null}.
115			*/
116			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
117			public void testComparatorIsNull(String description, NavigableMap<?,?> navigableMap) {
118			Comparator comparator = navigableMap.comparator();
119
120			assertTrue(comparator == null \|\| comparator == Collections.reverseOrder(), description + ": Comparator (" + comparator + ") is not null.");
121			}
122
123			/**
124			* Tests that contains requires Comparable
125			*/
126			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
127			public void testContainsRequiresComparable(String description, NavigableMap<?,?> navigableMap) {
128	jsr166	1.8	assertThrowsCCE(
129			() -> navigableMap.containsKey(new Object()),
130	jsr166	1.9	description + ": Comparable should be required");
131	jsr166	1.1	}
132
133			/**
134			* Tests that the contains method returns {@code false}.
135			*/
136			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
137			public void testContains(String description, NavigableMap<?,?> navigableMap) {
138			assertFalse(navigableMap.containsKey(new Integer(1)),
139			description + ": Should not contain any elements.");
140			assertFalse(navigableMap.containsValue(new Integer(1)),
141			description + ": Should not contain any elements.");
142			}
143
144			/**
145			* Tests that the containsAll method returns {@code false}.
146			*/
147			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
148			public void testContainsAll(String description, NavigableMap<?,?> navigableMap) {
149			TreeMap treeMap = new TreeMap();
150			treeMap.put("1", 1);
151			treeMap.put("2", 2);
152			treeMap.put("3", 3);
153
154			assertFalse(navigableMap.equals(treeMap), "Should not contain any elements.");
155			}
156
157			/**
158			* Tests that the iterator is empty.
159			*/
160			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
161			public void testEmptyIterator(String description, NavigableMap<?,?> navigableMap) {
162			assertFalse(navigableMap.keySet().iterator().hasNext(), "The iterator is not empty.");
163			assertFalse(navigableMap.values().iterator().hasNext(), "The iterator is not empty.");
164			assertFalse(navigableMap.entrySet().iterator().hasNext(), "The iterator is not empty.");
165			}
166
167			/**
168			* Tests that the set is empty.
169			*/
170			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
171			public void testIsEmpty(String description, NavigableMap<?,?> navigableMap) {
172			assertTrue(navigableMap.isEmpty(), "The set is not empty.");
173			}
174
175			/**
176			* Tests the headMap() method.
177			*/
178			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
179			public void testHeadMap(String description, NavigableMap navigableMap) {
180	jsr166	1.6	assertThrowsNPE(
181	jsr166	1.1	() -> { NavigableMap ss = navigableMap.headMap(null, false); },
182			description + ": Must throw NullPointerException for null element");
183
184	jsr166	1.6	assertThrowsCCE(
185	jsr166	1.1	() -> { NavigableMap ss = navigableMap.headMap(new Object(), true); },
186			description + ": Must throw ClassCastException for non-Comparable element");
187
188			NavigableMap ss = navigableMap.headMap("1", false);
189
190			assertEmptyNavigableMap(ss, description + ": Returned value is not empty navigable set.");
191			}
192
193			/**
194			* Tests that the size is 0.
195			*/
196			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
197			public void testSizeIsZero(String description, NavigableMap<?,?> navigableMap) {
198			assertTrue(0 == navigableMap.size(), "The size of the set is not 0.");
199			}
200
201			/**
202			* Tests the subMap() method.
203			*/
204			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
205			public void testSubMap(String description, NavigableMap navigableMap) {
206	jsr166	1.6	assertThrowsNPE(
207	jsr166	1.1	() -> {
208			SortedMap ss = navigableMap.subMap(null, BigInteger.TEN);
209			},
210			description + ": Must throw NullPointerException for null element");
211
212	jsr166	1.6	assertThrowsNPE(
213	jsr166	1.1	() -> {
214			SortedMap ss = navigableMap.subMap(BigInteger.ZERO, null);
215			},
216			description + ": Must throw NullPointerException for null element");
217
218	jsr166	1.6	assertThrowsNPE(
219	jsr166	1.1	() -> {
220			SortedMap ss = navigableMap.subMap(null, null);
221			},
222			description + ": Must throw NullPointerException for null element");
223
224			Object obj1 = new Object();
225			Object obj2 = new Object();
226
227	jsr166	1.6	assertThrowsCCE(
228	jsr166	1.1	() -> {
229			SortedMap ss = navigableMap.subMap(obj1, BigInteger.TEN);
230			},
231	jsr166	1.6	description + ": Must throw ClassCastException for parameter which is not Comparable.");
232	jsr166	1.1
233	jsr166	1.6	assertThrowsCCE(
234	jsr166	1.1	() -> {
235			SortedMap ss = navigableMap.subMap(BigInteger.ZERO, obj2);
236			},
237	jsr166	1.6	description + ": Must throw ClassCastException for parameter which is not Comparable.");
238	jsr166	1.1
239	jsr166	1.6	assertThrowsCCE(
240	jsr166	1.1	() -> {
241			SortedMap ss = navigableMap.subMap(obj1, obj2);
242			},
243	jsr166	1.6	description + ": Must throw ClassCastException for parameter which is not Comparable.");
244	jsr166	1.1
245			// minimal range
246			navigableMap.subMap(BigInteger.ZERO, false, BigInteger.ZERO, false);
247			navigableMap.subMap(BigInteger.ZERO, false, BigInteger.ZERO, true);
248			navigableMap.subMap(BigInteger.ZERO, true, BigInteger.ZERO, false);
249			navigableMap.subMap(BigInteger.ZERO, true, BigInteger.ZERO, true);
250
251			Object first = isDescending(navigableMap) ? BigInteger.TEN : BigInteger.ZERO;
252			Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;
253
254	jsr166	1.6	assertThrowsIAE(
255	jsr166	1.8	() -> navigableMap.subMap(last, true, first, false),
256	jsr166	1.6	description + ": Must throw IllegalArgumentException when fromElement is not less than toElement.");
257	jsr166	1.1
258			navigableMap.subMap(first, true, last, false);
259			}
260
261			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
262			public void testSubMapRanges(String description, NavigableMap navigableMap) {
263			Object first = isDescending(navigableMap) ? BigInteger.TEN : BigInteger.ZERO;
264			Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;
265
266			NavigableMap subMap = navigableMap.subMap(first, true, last, true);
267
268			// same subset
269			subMap.subMap(first, true, last, true);
270
271			// slightly smaller
272			NavigableMap ns = subMap.subMap(first, false, last, false);
273	jsr166	1.2	// slight expansion
274	jsr166	1.8	assertThrowsIAE(
275			() -> ns.subMap(first, true, last, true),
276	jsr166	1.1	description + ": Expansion should not be allowed");
277
278			// much smaller
279			subMap.subMap(first, false, BigInteger.ONE, false);
280			}
281
282			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
283			public void testheadMapRanges(String description, NavigableMap navigableMap) {
284			NavigableMap subMap = navigableMap.headMap(BigInteger.ONE, true);
285
286			// same subset
287			subMap.headMap(BigInteger.ONE, true);
288
289			// slightly smaller
290			NavigableMap ns = subMap.headMap(BigInteger.ONE, false);
291
292	jsr166	1.2	// slight expansion
293	jsr166	1.8	assertThrowsIAE(
294			() -> ns.headMap(BigInteger.ONE, true),
295	jsr166	1.1	description + ": Expansion should not be allowed");
296
297			// much smaller
298			subMap.headMap(isDescending(subMap) ? BigInteger.TEN : BigInteger.ZERO, true);
299			}
300
301			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
302			public void testTailMapRanges(String description, NavigableMap navigableMap) {
303			NavigableMap subMap = navigableMap.tailMap(BigInteger.ONE, true);
304
305			// same subset
306			subMap.tailMap(BigInteger.ONE, true);
307
308			// slightly smaller
309			NavigableMap ns = subMap.tailMap(BigInteger.ONE, false);
310
311	jsr166	1.2	// slight expansion
312	jsr166	1.8	assertThrowsIAE(
313			() -> ns.tailMap(BigInteger.ONE, true),
314	jsr166	1.1	description + ": Expansion should not be allowed");
315
316			// much smaller
317			subMap.tailMap(isDescending(subMap) ? BigInteger.ZERO : BigInteger.TEN, false);
318			}
319
320			/**
321			* Tests the tailMap() method.
322			*/
323			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
324			public void testTailMap(String description, NavigableMap navigableMap) {
325	jsr166	1.8	assertThrowsNPE(
326			() -> navigableMap.tailMap(null),
327	jsr166	1.1	description + ": Must throw NullPointerException for null element");
328
329	jsr166	1.8	assertThrowsCCE(
330			() -> navigableMap.tailMap(new Object()),
331	jsr166	1.6	description);
332	jsr166	1.1
333			NavigableMap ss = navigableMap.tailMap("1", true);
334
335			assertEmptyNavigableMap(ss, description + ": Returned value is not empty navigable set.");
336			}
337
338			@DataProvider(name = "NavigableMap<?,?>", parallel = true)
339			public static Iterator<Object[]> navigableMapsProvider() {
340			return makeNavigableMaps().iterator();
341			}
342
343			public static Collection<Object[]> makeNavigableMaps() {
344			return Arrays.asList(
345			new Object[]{"UnmodifiableNavigableMap(TreeMap)", Collections.unmodifiableNavigableMap(new TreeMap())},
346			new Object[]{"UnmodifiableNavigableMap(TreeMap.descendingMap()", Collections.unmodifiableNavigableMap(new TreeMap().descendingMap())},
347			new Object[]{"UnmodifiableNavigableMap(TreeMap.descendingMap().descendingMap()", Collections.unmodifiableNavigableMap(new TreeMap().descendingMap().descendingMap())},
348			new Object[]{"emptyNavigableMap()", Collections.emptyNavigableMap()},
349			new Object[]{"emptyNavigableMap().descendingMap()", Collections.emptyNavigableMap().descendingMap()},
350			new Object[]{"emptyNavigableMap().descendingMap().descendingMap()", Collections.emptyNavigableMap().descendingMap().descendingMap()}
351			);
352			}
353			}