1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/*
* Copyright (C) 2011 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.base;
import static org.junit.contrib.truth.Truth.ASSERT;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.ImmutableList;
import com.google.common.testing.NullPointerTester;
import com.google.common.testing.SerializableTester;
import junit.framework.TestCase;
import java.util.Collections;
import java.util.List;
import java.util.Set;
/**
* Unit test for {@link Optional}.
*
* @author Kurt Alfred Kluever
*/
@GwtCompatible(emulated = true)
public final class OptionalTest extends TestCase {
public void testAbsent() {
Optional<String> optionalName = Optional.absent();
assertFalse(optionalName.isPresent());
}
public void testOf() {
assertEquals("training", Optional.of("training").get());
}
public void testOf_null() {
try {
Optional.of(null);
fail();
} catch (NullPointerException expected) {
}
}
public void testFromNullable() {
Optional<String> optionalName = Optional.fromNullable("bob");
assertEquals("bob", optionalName.get());
}
public void testFromNullable_null() {
// not promised by spec, but easier to test
assertSame(Optional.absent(), Optional.fromNullable(null));
}
public void testIsPresent_no() {
assertFalse(Optional.absent().isPresent());
}
public void testIsPresent_yes() {
assertTrue(Optional.of("training").isPresent());
}
public void testGet_absent() {
Optional<String> optional = Optional.absent();
try {
optional.get();
fail();
} catch (IllegalStateException expected) {
}
}
public void testGet_present() {
assertEquals("training", Optional.of("training").get());
}
public void testOr_T_present() {
assertEquals("a", Optional.of("a").or("default"));
}
public void testOr_T_absent() {
assertEquals("default", Optional.absent().or("default"));
}
public void testOr_Supplier_present() {
assertEquals("a", Optional.of("a").or(Suppliers.ofInstance("fallback")));
}
public void testOr_Supplier_absent() {
assertEquals("fallback", Optional.absent().or(Suppliers.ofInstance("fallback")));
}
public void testOr_NullSupplier_absent() {
Supplier<Object> nullSupplier = Suppliers.ofInstance(null);
Optional<Object> absentOptional = Optional.absent();
try {
absentOptional.or(nullSupplier);
fail();
} catch (NullPointerException expected) {
}
}
public void testOr_Optional_present() {
assertEquals(Optional.of("a"), Optional.of("a").or(Optional.of("fallback")));
}
public void testOr_Optional_absent() {
assertEquals(Optional.of("fallback"), Optional.absent().or(Optional.of("fallback")));
}
public void testOrNull_present() {
assertEquals("a", Optional.of("a").orNull());
}
public void testOrNull_absent() {
assertNull(Optional.absent().orNull());
}
public void testAsSet_present() {
Set<String> expected = Collections.singleton("a");
assertEquals(expected, Optional.of("a").asSet());
}
public void testAsSet_absent() {
assertTrue("Returned set should be empty", Optional.absent().asSet().isEmpty());
}
public void testAsSet_presentIsImmutable() {
Set<String> presentAsSet = Optional.of("a").asSet();
try {
presentAsSet.add("b");
fail();
} catch (UnsupportedOperationException expected) {
}
}
public void testAsSet_absentIsImmutable() {
Set<Object> absentAsSet = Optional.absent().asSet();
try {
absentAsSet.add("foo");
fail();
} catch (UnsupportedOperationException expected) {
}
}
// TODO(kevinb): use EqualsTester
public void testEqualsAndHashCode_absent() {
assertEquals(Optional.<String>absent(), Optional.<Integer>absent());
assertEquals(Optional.absent().hashCode(), Optional.absent().hashCode());
}
public void testEqualsAndHashCode_present() {
assertEquals(Optional.of("training"), Optional.of("training"));
assertFalse(Optional.of("a").equals(Optional.of("b")));
assertFalse(Optional.of("a").equals(Optional.absent()));
assertEquals(Optional.of("training").hashCode(), Optional.of("training").hashCode());
}
public void testToString_absent() {
assertEquals("Optional.absent()", Optional.absent().toString());
}
public void testToString_present() {
assertEquals("Optional.of(training)", Optional.of("training").toString());
}
public void testPresentInstances_allPresent() {
List<Optional<String>> optionals =
ImmutableList.of(Optional.of("a"), Optional.of("b"), Optional.of("c"));
ASSERT.that(Optional.presentInstances(optionals)).hasContentsInOrder("a", "b", "c");
}
public void testPresentInstances_allAbsent() {
List<Optional<Object>> optionals =
ImmutableList.of(Optional.absent(), Optional.absent());
ASSERT.that(Optional.presentInstances(optionals)).isEmpty();
}
public void testPresentInstances_somePresent() {
List<Optional<String>> optionals =
ImmutableList.of(Optional.of("a"), Optional.<String>absent(), Optional.of("c"));
ASSERT.that(Optional.presentInstances(optionals)).hasContentsInOrder("a", "c");
}
public void testPresentInstances_callingIteratorTwice() {
List<Optional<String>> optionals =
ImmutableList.of(Optional.of("a"), Optional.<String>absent(), Optional.of("c"));
Iterable<String> onlyPresent = Optional.presentInstances(optionals);
ASSERT.that(onlyPresent).hasContentsInOrder("a", "c");
ASSERT.that(onlyPresent).hasContentsInOrder("a", "c");
}
@GwtIncompatible("SerializableTester")
public void testSerialization() {
SerializableTester.reserializeAndAssert(Optional.absent());
SerializableTester.reserializeAndAssert(Optional.of("foo"));
}
@GwtIncompatible("NullPointerTester")
public void testNullPointers() throws Exception {
NullPointerTester npTester = new NullPointerTester();
npTester.testAllPublicConstructors(Optional.class);
npTester.testAllPublicStaticMethods(Optional.class);
npTester.testAllPublicInstanceMethods(Optional.absent());
npTester.testAllPublicInstanceMethods(Optional.of("training"));
}
}
|
