util/Collections/EmptyNavigableSet.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.emptyNavigableSet
 * @run testng EmptyNavigableSet
 */
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.NavigableSet;
import java.util.SortedSet;
import java.util.TreeSet;
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 EmptyNavigableSet {

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

    public static <T extends Throwable> void assertEmptyNavigableSet(Object obj, String message) {
        assertInstance(obj, NavigableSet.class, message);
        assertTrue(((NavigableSet)obj).isEmpty() && (((NavigableSet)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(SortedSet<?> 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 = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testComparatorIsNull(String description, NavigableSet<?> navigableSet) {
        Comparator comparator = navigableSet.comparator();

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

    /**
     * Tests that contains requires Comparable
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testContainsRequiresComparable(String description, NavigableSet<?> navigableSet) {
        assertThrows(() -> {
            navigableSet.contains(new Object());
        },
            ClassCastException.class,
            description + ": Compareable should be required");
    }

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

    /**
     * Tests that the containsAll method returns {@code false}.
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testContainsAll(String description, NavigableSet<?> navigableSet) {
        TreeSet treeSet = new TreeSet();
        treeSet.add("1");
        treeSet.add("2");
        treeSet.add("3");

        assertFalse(navigableSet.containsAll(treeSet), "Should not contain any elements.");
    }

    /**
     * Tests that the iterator is empty.
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testEmptyIterator(String description, NavigableSet<?> navigableSet) {
        Iterator emptyIterator = navigableSet.iterator();

        assertFalse((emptyIterator != null) && (emptyIterator.hasNext()),
            "The iterator is not empty.");
    }

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

    /**
     * Tests that the first() method throws NoSuchElementException
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testFirst(String description, NavigableSet<?> navigableSet) {
        assertThrows(() -> {
            navigableSet.first();
        }, NoSuchElementException.class, description);
    }

    /**
     * Tests the headSet() method.
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testHeadSet(String description, NavigableSet navigableSet) {
        assertThrows(
            () -> { NavigableSet ns = navigableSet.headSet(null, false); },
            NullPointerException.class,
            description + ": Must throw NullPointerException for null element");

        assertThrows(
            () -> { NavigableSet ns = navigableSet.headSet(new Object(), true); },
            ClassCastException.class,
            description + ": Must throw ClassCastException for non-Comparable element");

        NavigableSet ns = navigableSet.headSet("1", false);

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

    /**
     * Tests that the last() method throws NoSuchElementException
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testLast(String description, NavigableSet<?> navigableSet) {
        assertThrows(() -> {
            navigableSet.last();
        }, NoSuchElementException.class, description);
    }

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

    /**
     * Tests the subSet() method.
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testSubSet(String description, NavigableSet navigableSet) {
        assertThrows(
            () -> {
                SortedSet ss = navigableSet.subSet(null, BigInteger.TEN);
            },
            NullPointerException.class,
            description + ": Must throw NullPointerException for null element");

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

        assertThrows(
            () -> {
                SortedSet ss = navigableSet.subSet(null, null);
            },
            NullPointerException.class,
            description + ": Must throw NullPointerException for null element");

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

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

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

        assertThrows(
            () -> {
                SortedSet ss = navigableSet.subSet(obj1, obj2);
            },
            ClassCastException.class, description
            + ": Must throw ClassCastException for parameter which is not Comparable.");

        // minimal range
        navigableSet.subSet(BigInteger.ZERO, false, BigInteger.ZERO, false);
        navigableSet.subSet(BigInteger.ZERO, false, BigInteger.ZERO, true);
        navigableSet.subSet(BigInteger.ZERO, true, BigInteger.ZERO, false);
        navigableSet.subSet(BigInteger.ZERO, true, BigInteger.ZERO, true);

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

            assertThrows(
                () -> {
                    navigableSet.subSet(last, true, first, false);
                },
                IllegalArgumentException.class, description
                + ": Must throw IllegalArgumentException when fromElement is not less then then toElement.");

        navigableSet.subSet(first, true, last, false);
    }

    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testSubSetRanges(String description, NavigableSet navigableSet) {
        Object first = isDescending(navigableSet) ? BigInteger.TEN : BigInteger.ZERO;
        Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;

        NavigableSet subSet = navigableSet.subSet(first, true, last, true);

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

        // slightly smaller
        NavigableSet ns = subSet.subSet(first, false, last, false);
        // slight expansion
        assertThrows(() -> {
            ns.subSet(first, true, last, true);
        },
            IllegalArgumentException.class,
            description + ": Expansion should not be allowed");

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

    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testheadSetRanges(String description, NavigableSet navigableSet) {
        NavigableSet subSet = navigableSet.headSet(BigInteger.ONE, true);

        // same subset
        subSet.headSet(BigInteger.ONE, true);

        // slightly smaller
        NavigableSet ns = subSet.headSet(BigInteger.ONE, false);

        // slight expansion
        assertThrows(() -> {
            ns.headSet(BigInteger.ONE, true);
        },
            IllegalArgumentException.class,
            description + ": Expansion should not be allowed");

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

    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testTailSetRanges(String description, NavigableSet navigableSet) {
        NavigableSet subSet = navigableSet.tailSet(BigInteger.ONE, true);

        // same subset
        subSet.tailSet(BigInteger.ONE, true);

        // slightly smaller
        NavigableSet ns = subSet.tailSet(BigInteger.ONE, false);

        // slight expansion
        assertThrows(() -> {
            ns.tailSet(BigInteger.ONE, true);
        },
            IllegalArgumentException.class,
            description + ": Expansion should not be allowed");

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

    /**
     * Tests the tailSet() method.
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testTailSet(String description, NavigableSet navigableSet) {
        assertThrows(() -> {
            navigableSet.tailSet(null);
        },
            NullPointerException.class,
            description + ": Must throw NullPointerException for null element");

        assertThrows(() -> {
            navigableSet.tailSet(new Object());
        }, ClassCastException.class);

        NavigableSet ss = navigableSet.tailSet("1", true);

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

    /**
     * Tests that the array has a size of 0.
     */
    @Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
    public void testToArray(String description, NavigableSet<?> navigableSet) {
        Object[] emptyNavigableSetArray = navigableSet.toArray();

        assertTrue(emptyNavigableSetArray.length == 0, "Returned non-empty Array.");

        emptyNavigableSetArray = new Object[20];

        Object[] result = navigableSet.toArray(emptyNavigableSetArray);

        assertSame(emptyNavigableSetArray, result);

        assertTrue(result[0] == null);
    }

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

    public static Collection<Object[]> makeNavigableSets() {
        return Arrays.asList(
            new Object[]{"UnmodifiableNavigableSet(TreeSet)", Collections.unmodifiableNavigableSet(new TreeSet())},
            new Object[]{"UnmodifiableNavigableSet(TreeSet.descendingSet()", Collections.unmodifiableNavigableSet(new TreeSet().descendingSet())},
            new Object[]{"UnmodifiableNavigableSet(TreeSet.descendingSet().descendingSet()", Collections.unmodifiableNavigableSet(new TreeSet().descendingSet().descendingSet())},
            new Object[]{"emptyNavigableSet()", Collections.emptyNavigableSet()},
            new Object[]{"emptyNavigableSet().descendingSet()", Collections.emptyNavigableSet().descendingSet()},
            new Object[]{"emptyNavigableSet().descendingSet().descendingSet()", Collections.emptyNavigableSet().descendingSet().descendingSet()}
        );
    }
}
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.emptyNavigableSet
28	* @run testng EmptyNavigableSet
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.NavigableSet;
38	import java.util.SortedSet;
39	import java.util.TreeSet;
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 EmptyNavigableSet {
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 assertEmptyNavigableSet(Object obj) {
61	assertInstance(obj, NavigableSet.class);
62	assertTrue(((NavigableSet)obj).isEmpty() && (((NavigableSet)obj).size() == 0));
63	}
64
65	public static <T extends Throwable> void assertEmptyNavigableSet(Object obj, String message) {
66	assertInstance(obj, NavigableSet.class, message);
67	assertTrue(((NavigableSet)obj).isEmpty() && (((NavigableSet)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(SortedSet<?> 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 = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
116	public void testComparatorIsNull(String description, NavigableSet<?> navigableSet) {
117	Comparator comparator = navigableSet.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 = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
126	public void testContainsRequiresComparable(String description, NavigableSet<?> navigableSet) {
127	assertThrows(() -> {
128	navigableSet.contains(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 = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
138	public void testContains(String description, NavigableSet<?> navigableSet) {
139	assertFalse(navigableSet.contains(new Integer(1)),
140	description + ": Should not contain any elements.");
141	}
142
143	/**
144	* Tests that the containsAll method returns {@code false}.
145	*/
146	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
147	public void testContainsAll(String description, NavigableSet<?> navigableSet) {
148	TreeSet treeSet = new TreeSet();
149	treeSet.add("1");
150	treeSet.add("2");
151	treeSet.add("3");
152
153	assertFalse(navigableSet.containsAll(treeSet), "Should not contain any elements.");
154	}
155
156	/**
157	* Tests that the iterator is empty.
158	*/
159	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
160	public void testEmptyIterator(String description, NavigableSet<?> navigableSet) {
161	Iterator emptyIterator = navigableSet.iterator();
162
163	assertFalse((emptyIterator != null) && (emptyIterator.hasNext()),
164	"The iterator is not empty.");
165	}
166
167	/**
168	* Tests that the set is empty.
169	*/
170	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
171	public void testIsEmpty(String description, NavigableSet<?> navigableSet) {
172	assertTrue(navigableSet.isEmpty(), "The set is not empty.");
173	}
174
175	/**
176	* Tests that the first() method throws NoSuchElementException
177	*/
178	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
179	public void testFirst(String description, NavigableSet<?> navigableSet) {
180	assertThrows(() -> {
181	navigableSet.first();
182	}, NoSuchElementException.class, description);
183	}
184
185	/**
186	* Tests the headSet() method.
187	*/
188	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
189	public void testHeadSet(String description, NavigableSet navigableSet) {
190	assertThrows(
191	() -> { NavigableSet ns = navigableSet.headSet(null, false); },
192	NullPointerException.class,
193	description + ": Must throw NullPointerException for null element");
194
195	assertThrows(
196	() -> { NavigableSet ns = navigableSet.headSet(new Object(), true); },
197	ClassCastException.class,
198	description + ": Must throw ClassCastException for non-Comparable element");
199
200	NavigableSet ns = navigableSet.headSet("1", false);
201
202	assertEmptyNavigableSet(ns, description + ": Returned value is not empty navigable set.");
203	}
204
205	/**
206	* Tests that the last() method throws NoSuchElementException
207	*/
208	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
209	public void testLast(String description, NavigableSet<?> navigableSet) {
210	assertThrows(() -> {
211	navigableSet.last();
212	}, NoSuchElementException.class, description);
213	}
214
215	/**
216	* Tests that the size is 0.
217	*/
218	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
219	public void testSizeIsZero(String description, NavigableSet<?> navigableSet) {
220	assertTrue(0 == navigableSet.size(), "The size of the set is not 0.");
221	}
222
223	/**
224	* Tests the subSet() method.
225	*/
226	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
227	public void testSubSet(String description, NavigableSet navigableSet) {
228	assertThrows(
229	() -> {
230	SortedSet ss = navigableSet.subSet(null, BigInteger.TEN);
231	},
232	NullPointerException.class,
233	description + ": Must throw NullPointerException for null element");
234
235	assertThrows(
236	() -> {
237	SortedSet ss = navigableSet.subSet(BigInteger.ZERO, null);
238	},
239	NullPointerException.class,
240	description + ": Must throw NullPointerException for null element");
241
242	assertThrows(
243	() -> {
244	SortedSet ss = navigableSet.subSet(null, null);
245	},
246	NullPointerException.class,
247	description + ": Must throw NullPointerException for null element");
248
249	Object obj1 = new Object();
250	Object obj2 = new Object();
251
252	assertThrows(
253	() -> {
254	SortedSet ss = navigableSet.subSet(obj1, BigInteger.TEN);
255	},
256	ClassCastException.class, description
257	+ ": Must throw ClassCastException for parameter which is not Comparable.");
258
259	assertThrows(
260	() -> {
261	SortedSet ss = navigableSet.subSet(BigInteger.ZERO, obj2);
262	},
263	ClassCastException.class, description
264	+ ": Must throw ClassCastException for parameter which is not Comparable.");
265
266	assertThrows(
267	() -> {
268	SortedSet ss = navigableSet.subSet(obj1, obj2);
269	},
270	ClassCastException.class, description
271	+ ": Must throw ClassCastException for parameter which is not Comparable.");
272
273	// minimal range
274	navigableSet.subSet(BigInteger.ZERO, false, BigInteger.ZERO, false);
275	navigableSet.subSet(BigInteger.ZERO, false, BigInteger.ZERO, true);
276	navigableSet.subSet(BigInteger.ZERO, true, BigInteger.ZERO, false);
277	navigableSet.subSet(BigInteger.ZERO, true, BigInteger.ZERO, true);
278
279	Object first = isDescending(navigableSet) ? BigInteger.TEN : BigInteger.ZERO;
280	Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;
281
282	assertThrows(
283	() -> {
284	navigableSet.subSet(last, true, first, false);
285	},
286	IllegalArgumentException.class, description
287	+ ": Must throw IllegalArgumentException when fromElement is not less then then toElement.");
288
289	navigableSet.subSet(first, true, last, false);
290	}
291
292	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
293	public void testSubSetRanges(String description, NavigableSet navigableSet) {
294	Object first = isDescending(navigableSet) ? BigInteger.TEN : BigInteger.ZERO;
295	Object last = (BigInteger.ZERO == first) ? BigInteger.TEN : BigInteger.ZERO;
296
297	NavigableSet subSet = navigableSet.subSet(first, true, last, true);
298
299	// same subset
300	subSet.subSet(first, true, last, true);
301
302	// slightly smaller
303	NavigableSet ns = subSet.subSet(first, false, last, false);
304	// slight expansion
305	assertThrows(() -> {
306	ns.subSet(first, true, last, true);
307	},
308	IllegalArgumentException.class,
309	description + ": Expansion should not be allowed");
310
311	// much smaller
312	subSet.subSet(first, false, BigInteger.ONE, false);
313	}
314
315	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
316	public void testheadSetRanges(String description, NavigableSet navigableSet) {
317	NavigableSet subSet = navigableSet.headSet(BigInteger.ONE, true);
318
319	// same subset
320	subSet.headSet(BigInteger.ONE, true);
321
322	// slightly smaller
323	NavigableSet ns = subSet.headSet(BigInteger.ONE, false);
324
325	// slight expansion
326	assertThrows(() -> {
327	ns.headSet(BigInteger.ONE, true);
328	},
329	IllegalArgumentException.class,
330	description + ": Expansion should not be allowed");
331
332	// much smaller
333	subSet.headSet(isDescending(subSet) ? BigInteger.TEN : BigInteger.ZERO, true);
334	}
335
336	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
337	public void testTailSetRanges(String description, NavigableSet navigableSet) {
338	NavigableSet subSet = navigableSet.tailSet(BigInteger.ONE, true);
339
340	// same subset
341	subSet.tailSet(BigInteger.ONE, true);
342
343	// slightly smaller
344	NavigableSet ns = subSet.tailSet(BigInteger.ONE, false);
345
346	// slight expansion
347	assertThrows(() -> {
348	ns.tailSet(BigInteger.ONE, true);
349	},
350	IllegalArgumentException.class,
351	description + ": Expansion should not be allowed");
352
353	// much smaller
354	subSet.tailSet(isDescending(subSet) ? BigInteger.ZERO : BigInteger.TEN, false);
355	}
356
357	/**
358	* Tests the tailSet() method.
359	*/
360	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
361	public void testTailSet(String description, NavigableSet navigableSet) {
362	assertThrows(() -> {
363	navigableSet.tailSet(null);
364	},
365	NullPointerException.class,
366	description + ": Must throw NullPointerException for null element");
367
368	assertThrows(() -> {
369	navigableSet.tailSet(new Object());
370	}, ClassCastException.class);
371
372	NavigableSet ss = navigableSet.tailSet("1", true);
373
374	assertEmptyNavigableSet(ss, description + ": Returned value is not empty navigable set.");
375	}
376
377	/**
378	* Tests that the array has a size of 0.
379	*/
380	@Test(dataProvider = "NavigableSet<?>", dataProviderClass = EmptyNavigableSet.class)
381	public void testToArray(String description, NavigableSet<?> navigableSet) {
382	Object[] emptyNavigableSetArray = navigableSet.toArray();
383
384	assertTrue(emptyNavigableSetArray.length == 0, "Returned non-empty Array.");
385
386	emptyNavigableSetArray = new Object[20];
387
388	Object[] result = navigableSet.toArray(emptyNavigableSetArray);
389
390	assertSame(emptyNavigableSetArray, result);
391
392	assertTrue(result[0] == null);
393	}
394
395	@DataProvider(name = "NavigableSet<?>", parallel = true)
396	public static Iterator<Object[]> navigableSetsProvider() {
397	return makeNavigableSets().iterator();
398	}
399
400	public static Collection<Object[]> makeNavigableSets() {
401	return Arrays.asList(
402	new Object[]{"UnmodifiableNavigableSet(TreeSet)", Collections.unmodifiableNavigableSet(new TreeSet())},
403	new Object[]{"UnmodifiableNavigableSet(TreeSet.descendingSet()", Collections.unmodifiableNavigableSet(new TreeSet().descendingSet())},
404	new Object[]{"UnmodifiableNavigableSet(TreeSet.descendingSet().descendingSet()", Collections.unmodifiableNavigableSet(new TreeSet().descendingSet().descendingSet())},
405	new Object[]{"emptyNavigableSet()", Collections.emptyNavigableSet()},
406	new Object[]{"emptyNavigableSet().descendingSet()", Collections.emptyNavigableSet().descendingSet()},
407	new Object[]{"emptyNavigableSet().descendingSet().descendingSet()", Collections.emptyNavigableSet().descendingSet().descendingSet()}
408	);
409	}
410	}