1 /*
2  * Copyright (C) 2008 The Guava Authors
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.google.common.collect.testing.testers;
18 
19 import static com.google.common.collect.testing.features.CollectionSize.ZERO;
20 
21 import com.google.common.annotations.GwtCompatible;
22 import com.google.common.collect.testing.features.CollectionSize;
23 
24 import java.util.Arrays;
25 
26 /**
27  * A generic JUnit test which tests {@code toArray()} operations on a list.
28  * Can't be invoked directly; please see
29  * {@link com.google.common.collect.testing.ListTestSuiteBuilder}.
30  *
31  * @author Chris Povirk
32  */
33 @GwtCompatible
34 public class ListToArrayTester<E> extends AbstractListTester<E> {
35   // CollectionToArrayTester tests everything except ordering.
36 
testToArray_noArg()37   public void testToArray_noArg() {
38     Object[] actual = getList().toArray();
39     assertArrayEquals("toArray() order should match list",
40         createOrderedArray(), actual);
41   }
42 
43   @CollectionSize.Require(absent = ZERO)
testToArray_tooSmall()44   public void testToArray_tooSmall() {
45     Object[] actual = getList().toArray(new Object[0]);
46     assertArrayEquals("toArray(tooSmall) order should match list",
47         createOrderedArray(), actual);
48   }
49 
testToArray_largeEnough()50   public void testToArray_largeEnough() {
51     Object[] actual = getList().toArray(new Object[getNumElements()]);
52     assertArrayEquals("toArray(largeEnough) order should match list",
53         createOrderedArray(), actual);
54   }
55 
assertArrayEquals(String message, Object[] expected, Object[] actual)56   private static void assertArrayEquals(String message, Object[] expected,
57       Object[] actual) {
58     assertEquals(message, Arrays.asList(expected), Arrays.asList(actual));
59   }
60 }
61