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
#	Content
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	// slight expansion
286	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	// slight expansion
307	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	// slight expansion
328	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	}