util/Collections/EmptyNavigableMap.java

/*
 * Copyright (c) 2011, 2013, 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.NoSuchElementException;
import java.util.NavigableMap;
import java.util.SortedMap;
import java.util.TreeMap;
import org.testng.annotations.Test;
import org.testng.annotations.DataProvider;

import static org.testng.Assert.fail;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertTrue;
import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertSame;

public class EmptyNavigableMap {

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

    public interface Thrower<T extends Throwable> {

        public void run() throws T;
    }

    public static <T extends Throwable> void assertThrows(Thrower<T> thrower, Class<T> throwable) {
        assertThrows(thrower, throwable, null);
    }

    public static <T extends Throwable> void assertThrows(Thrower<T> thrower, Class<T> throwable, String message) {
        Throwable result;
        try {
            thrower.run();
            fail(((null != message) ? message : "") + "Failed to throw " + throwable.getCanonicalName() + ". ");
            return;
        } catch (Throwable caught) {
            result = caught;
        }

        assertInstance(result, throwable, ((null != message) ? message : "") + "Failed to throw " + throwable.getCanonicalName() + ". ");
    }

    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) {
        assertThrows(() -> {
            navigableMap.containsKey(new Object());
        },
            ClassCastException.class,
            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) {
        assertThrows(
            () -> { NavigableMap ss = navigableMap.headMap(null, false); },
            NullPointerException.class,
            description + ": Must throw NullPointerException for null element");

        assertThrows(
            () -> { NavigableMap ss = navigableMap.headMap(new Object(), true); },
            ClassCastException.class,
            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) {
        assertThrows(
            () -> {
                SortedMap ss = navigableMap.subMap(null, BigInteger.TEN);
            },
            NullPointerException.class,
            description + ": Must throw NullPointerException for null element");

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

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

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

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

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

        assertThrows(
            () -> {
                SortedMap ss = navigableMap.subMap(obj1, obj2);
            },
            ClassCastException.class, 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;

            assertThrows(
                () -> {
                    navigableMap.subMap(last, true, first, false);
                },
                IllegalArgumentException.class, description
                + ": Must throw IllegalArgumentException when fromElement is not less then then 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
        assertThrows(() -> {
            ns.subMap(first, true, last, true);
        },
            IllegalArgumentException.class,
            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
        assertThrows(() -> {
            ns.headMap(BigInteger.ONE, true);
        },
            IllegalArgumentException.class,
            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
        assertThrows(() -> {
            ns.tailMap(BigInteger.ONE, true);
        },
            IllegalArgumentException.class,
            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) {
        assertThrows(() -> {
            navigableMap.tailMap(null);
        },
            NullPointerException.class,
            description + ": Must throw NullPointerException for null element");

        assertThrows(() -> {
            navigableMap.tailMap(new Object());
        }, ClassCastException.class);

        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:	1.2
Committed:	Thu Sep 10 01:03:38 2015 UTC (8 years, 8 months ago) by jsr166
Branch:	MAIN
Changes since 1.1:	+3 -3 lines
Log Message:	typo
#	User	Rev	Content
1	jsr166	1.1	/*
2			* Copyright (c) 2011, 2013, 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.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.NoSuchElementException;
37			import java.util.NavigableMap;
38			import java.util.SortedMap;
39			import java.util.TreeMap;
40			import org.testng.annotations.Test;
41			import org.testng.annotations.DataProvider;
42
43			import static org.testng.Assert.fail;
44			import static org.testng.Assert.assertEquals;
45			import static org.testng.Assert.assertTrue;
46			import static org.testng.Assert.assertFalse;
47			import static org.testng.Assert.assertSame;
48
49			public class EmptyNavigableMap {
50
51			public static <T> void assertInstance(T actual, Class<? extends T> expected) {
52			assertInstance(expected.isInstance(actual), null);
53			}
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			public interface Thrower<T extends Throwable> {
72
73			public void run() throws T;
74			}
75
76			public static <T extends Throwable> void assertThrows(Thrower<T> thrower, Class<T> throwable) {
77			assertThrows(thrower, throwable, null);
78			}
79
80			public static <T extends Throwable> void assertThrows(Thrower<T> thrower, Class<T> throwable, String message) {
81			Throwable result;
82			try {
83			thrower.run();
84			fail(((null != message) ? message : "") + "Failed to throw " + throwable.getCanonicalName() + ". ");
85			return;
86			} catch (Throwable caught) {
87			result = caught;
88			}
89
90			assertInstance(result, throwable, ((null != message) ? message : "") + "Failed to throw " + throwable.getCanonicalName() + ". ");
91			}
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			assertThrows(() -> {
128			navigableMap.containsKey(new Object());
129			},
130			ClassCastException.class,
131			description + ": Compareable should be required");
132			}
133
134			/**
135			* Tests that the contains method returns {@code false}.
136			*/
137			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
138			public void testContains(String description, NavigableMap<?,?> navigableMap) {
139			assertFalse(navigableMap.containsKey(new Integer(1)),
140			description + ": Should not contain any elements.");
141			assertFalse(navigableMap.containsValue(new Integer(1)),
142			description + ": Should not contain any elements.");
143			}
144
145			/**
146			* Tests that the containsAll method returns {@code false}.
147			*/
148			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
149			public void testContainsAll(String description, NavigableMap<?,?> navigableMap) {
150			TreeMap treeMap = new TreeMap();
151			treeMap.put("1", 1);
152			treeMap.put("2", 2);
153			treeMap.put("3", 3);
154
155			assertFalse(navigableMap.equals(treeMap), "Should not contain any elements.");
156			}
157
158			/**
159			* Tests that the iterator is empty.
160			*/
161			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
162			public void testEmptyIterator(String description, NavigableMap<?,?> navigableMap) {
163			assertFalse(navigableMap.keySet().iterator().hasNext(), "The iterator is not empty.");
164			assertFalse(navigableMap.values().iterator().hasNext(), "The iterator is not empty.");
165			assertFalse(navigableMap.entrySet().iterator().hasNext(), "The iterator is not empty.");
166			}
167
168			/**
169			* Tests that the set is empty.
170			*/
171			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
172			public void testIsEmpty(String description, NavigableMap<?,?> navigableMap) {
173			assertTrue(navigableMap.isEmpty(), "The set is not empty.");
174			}
175
176			/**
177			* Tests the headMap() method.
178			*/
179			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
180			public void testHeadMap(String description, NavigableMap navigableMap) {
181			assertThrows(
182			() -> { NavigableMap ss = navigableMap.headMap(null, false); },
183			NullPointerException.class,
184			description + ": Must throw NullPointerException for null element");
185
186			assertThrows(
187			() -> { NavigableMap ss = navigableMap.headMap(new Object(), true); },
188			ClassCastException.class,
189			description + ": Must throw ClassCastException for non-Comparable element");
190
191			NavigableMap ss = navigableMap.headMap("1", false);
192
193			assertEmptyNavigableMap(ss, description + ": Returned value is not empty navigable set.");
194			}
195
196			/**
197			* Tests that the size is 0.
198			*/
199			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
200			public void testSizeIsZero(String description, NavigableMap<?,?> navigableMap) {
201			assertTrue(0 == navigableMap.size(), "The size of the set is not 0.");
202			}
203
204			/**
205			* Tests the subMap() method.
206			*/
207			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
208			public void testSubMap(String description, NavigableMap navigableMap) {
209			assertThrows(
210			() -> {
211			SortedMap ss = navigableMap.subMap(null, BigInteger.TEN);
212			},
213			NullPointerException.class,
214			description + ": Must throw NullPointerException for null element");
215
216			assertThrows(
217			() -> {
218			SortedMap ss = navigableMap.subMap(BigInteger.ZERO, null);
219			},
220			NullPointerException.class,
221			description + ": Must throw NullPointerException for null element");
222
223			assertThrows(
224			() -> {
225			SortedMap ss = navigableMap.subMap(null, null);
226			},
227			NullPointerException.class,
228			description + ": Must throw NullPointerException for null element");
229
230			Object obj1 = new Object();
231			Object obj2 = new Object();
232
233			assertThrows(
234			() -> {
235			SortedMap ss = navigableMap.subMap(obj1, BigInteger.TEN);
236			},
237			ClassCastException.class, description
238			+ ": Must throw ClassCastException for parameter which is not Comparable.");
239
240			assertThrows(
241			() -> {
242			SortedMap ss = navigableMap.subMap(BigInteger.ZERO, obj2);
243			},
244			ClassCastException.class, description
245			+ ": Must throw ClassCastException for parameter which is not Comparable.");
246
247			assertThrows(
248			() -> {
249			SortedMap ss = navigableMap.subMap(obj1, obj2);
250			},
251			ClassCastException.class, description
252			+ ": Must throw ClassCastException for parameter which is not Comparable.");
253
254			// minimal range
255			navigableMap.subMap(BigInteger.ZERO, false, BigInteger.ZERO, false);
256			navigableMap.subMap(BigInteger.ZERO, false, BigInteger.ZERO, true);
257			navigableMap.subMap(BigInteger.ZERO, true, BigInteger.ZERO, false);
258			navigableMap.subMap(BigInteger.ZERO, true, BigInteger.ZERO, true);
259
260			Object first = isDescending(navigableMap) ? BigInteger.TEN : BigInteger.ZERO;
261			Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;
262
263			assertThrows(
264			() -> {
265			navigableMap.subMap(last, true, first, false);
266			},
267			IllegalArgumentException.class, description
268			+ ": Must throw IllegalArgumentException when fromElement is not less then then toElement.");
269
270			navigableMap.subMap(first, true, last, false);
271			}
272
273			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
274			public void testSubMapRanges(String description, NavigableMap navigableMap) {
275			Object first = isDescending(navigableMap) ? BigInteger.TEN : BigInteger.ZERO;
276			Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;
277
278			NavigableMap subMap = navigableMap.subMap(first, true, last, true);
279
280			// same subset
281			subMap.subMap(first, true, last, true);
282
283			// slightly smaller
284			NavigableMap ns = subMap.subMap(first, false, last, false);
285	jsr166	1.2	// slight expansion
286	jsr166	1.1	assertThrows(() -> {
287			ns.subMap(first, true, last, true);
288			},
289			IllegalArgumentException.class,
290			description + ": Expansion should not be allowed");
291
292			// much smaller
293			subMap.subMap(first, false, BigInteger.ONE, false);
294			}
295
296			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
297			public void testheadMapRanges(String description, NavigableMap navigableMap) {
298			NavigableMap subMap = navigableMap.headMap(BigInteger.ONE, true);
299
300			// same subset
301			subMap.headMap(BigInteger.ONE, true);
302
303			// slightly smaller
304			NavigableMap ns = subMap.headMap(BigInteger.ONE, false);
305
306	jsr166	1.2	// slight expansion
307	jsr166	1.1	assertThrows(() -> {
308			ns.headMap(BigInteger.ONE, true);
309			},
310			IllegalArgumentException.class,
311			description + ": Expansion should not be allowed");
312
313			// much smaller
314			subMap.headMap(isDescending(subMap) ? BigInteger.TEN : BigInteger.ZERO, true);
315			}
316
317			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
318			public void testTailMapRanges(String description, NavigableMap navigableMap) {
319			NavigableMap subMap = navigableMap.tailMap(BigInteger.ONE, true);
320
321			// same subset
322			subMap.tailMap(BigInteger.ONE, true);
323
324			// slightly smaller
325			NavigableMap ns = subMap.tailMap(BigInteger.ONE, false);
326
327	jsr166	1.2	// slight expansion
328	jsr166	1.1	assertThrows(() -> {
329			ns.tailMap(BigInteger.ONE, true);
330			},
331			IllegalArgumentException.class,
332			description + ": Expansion should not be allowed");
333
334			// much smaller
335			subMap.tailMap(isDescending(subMap) ? BigInteger.ZERO : BigInteger.TEN, false);
336			}
337
338			/**
339			* Tests the tailMap() method.
340			*/
341			@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
342			public void testTailMap(String description, NavigableMap navigableMap) {
343			assertThrows(() -> {
344			navigableMap.tailMap(null);
345			},
346			NullPointerException.class,
347			description + ": Must throw NullPointerException for null element");
348
349			assertThrows(() -> {
350			navigableMap.tailMap(new Object());
351			}, ClassCastException.class);
352
353			NavigableMap ss = navigableMap.tailMap("1", true);
354
355			assertEmptyNavigableMap(ss, description + ": Returned value is not empty navigable set.");
356			}
357
358			@DataProvider(name = "NavigableMap<?,?>", parallel = true)
359			public static Iterator<Object[]> navigableMapsProvider() {
360			return makeNavigableMaps().iterator();
361			}
362
363			public static Collection<Object[]> makeNavigableMaps() {
364			return Arrays.asList(
365			new Object[]{"UnmodifiableNavigableMap(TreeMap)", Collections.unmodifiableNavigableMap(new TreeMap())},
366			new Object[]{"UnmodifiableNavigableMap(TreeMap.descendingMap()", Collections.unmodifiableNavigableMap(new TreeMap().descendingMap())},
367			new Object[]{"UnmodifiableNavigableMap(TreeMap.descendingMap().descendingMap()", Collections.unmodifiableNavigableMap(new TreeMap().descendingMap().descendingMap())},
368			new Object[]{"emptyNavigableMap()", Collections.emptyNavigableMap()},
369			new Object[]{"emptyNavigableMap().descendingMap()", Collections.emptyNavigableMap().descendingMap()},
370			new Object[]{"emptyNavigableMap().descendingMap().descendingMap()", Collections.emptyNavigableMap().descendingMap().descendingMap()}
371			);
372			}
373			}