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
#	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.emptyNavigableMap
28	* @run testng EmptyNavigableMap
29	*/
30
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	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
46	import static org.testng.Assert.assertFalse;
47	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	assertInstance(actual, expected, 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	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
82	private void assertThrowsCCE(ThrowingRunnable r, String s) {
83	assertThrows(ClassCastException.class, r, s);
84	}
85
86	private void assertThrowsNPE(ThrowingRunnable r, String s) {
87	assertThrows(NullPointerException.class, r, s);
88	}
89
90	private void assertThrowsIAE(ThrowingRunnable r, String s) {
91	assertThrows(IllegalArgumentException.class, r, s);
92	}
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	assertThrowsCCE(
129	() -> navigableMap.containsKey(new Object()),
130	description + ": Comparable should be required");
131	}
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	assertThrowsNPE(
181	() -> { NavigableMap ss = navigableMap.headMap(null, false); },
182	description + ": Must throw NullPointerException for null element");
183
184	assertThrowsCCE(
185	() -> { 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	assertThrowsNPE(
207	() -> {
208	SortedMap ss = navigableMap.subMap(null, BigInteger.TEN);
209	},
210	description + ": Must throw NullPointerException for null element");
211
212	assertThrowsNPE(
213	() -> {
214	SortedMap ss = navigableMap.subMap(BigInteger.ZERO, null);
215	},
216	description + ": Must throw NullPointerException for null element");
217
218	assertThrowsNPE(
219	() -> {
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	assertThrowsCCE(
228	() -> {
229	SortedMap ss = navigableMap.subMap(obj1, BigInteger.TEN);
230	},
231	description + ": Must throw ClassCastException for parameter which is not Comparable.");
232
233	assertThrowsCCE(
234	() -> {
235	SortedMap ss = navigableMap.subMap(BigInteger.ZERO, obj2);
236	},
237	description + ": Must throw ClassCastException for parameter which is not Comparable.");
238
239	assertThrowsCCE(
240	() -> {
241	SortedMap ss = navigableMap.subMap(obj1, obj2);
242	},
243	description + ": Must throw ClassCastException for parameter which is not Comparable.");
244
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	assertThrowsIAE(
255	() -> navigableMap.subMap(last, true, first, false),
256	description + ": Must throw IllegalArgumentException when fromElement is not less than toElement.");
257
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	// slight expansion
274	assertThrowsIAE(
275	() -> ns.subMap(first, true, last, true),
276	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	// slight expansion
293	assertThrowsIAE(
294	() -> ns.headMap(BigInteger.ONE, true),
295	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	// slight expansion
312	assertThrowsIAE(
313	() -> ns.tailMap(BigInteger.ONE, true),
314	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	assertThrowsNPE(
326	() -> navigableMap.tailMap(null),
327	description + ": Must throw NullPointerException for null element");
328
329	assertThrowsCCE(
330	() -> navigableMap.tailMap(new Object()),
331	description);
332
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	}