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
|
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.commons.lang3;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.core.Is.is;
import static org.hamcrest.core.IsEqual.equalTo;
import static org.hamcrest.core.IsNull.nullValue;
import static org.junit.jupiter.api.Assertions.assertAll;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.DynamicTest.dynamicTest;
import java.lang.reflect.UndeclaredThrowableException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.apache.commons.lang3.Functions.FailableConsumer;
import org.apache.commons.lang3.Functions.FailablePredicate;
import org.junit.jupiter.api.DynamicTest;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.TestFactory;
import org.junit.jupiter.api.function.Executable;
import org.xml.sax.SAXException;
public class StreamsTest extends AbstractLangTest {
@Test
public void testSimpleStreamMap() {
final List<String> input = Arrays.asList("1", "2", "3", "4", "5", "6");
final List<Integer> output = Functions.stream(input).map(Integer::valueOf).collect(Collectors.toList());
assertEquals(6, output.size());
for (int i = 0; i < 6; i++) {
assertEquals(i+1, output.get(i).intValue());
}
}
@Test
public void testSimpleStreamMapFailing() {
final List<String> input = Arrays.asList("1", "2", "3", "4 ", "5", "6");
final Executable testMethod = () -> Functions.stream(input).map(Integer::valueOf).collect(Collectors.toList());
final NumberFormatException thrown = assertThrows(NumberFormatException.class, testMethod);
assertEquals("For input string: \"4 \"", thrown.getMessage());
}
@Test
public void testSimpleStreamForEach() {
final List<String> input = Arrays.asList("1", "2", "3", "4", "5", "6");
final List<Integer> output = new ArrayList<>();
Functions.stream(input).forEach(s -> output.add(Integer.valueOf(s)));
assertEquals(6, output.size());
for (int i = 0; i < 6; i++) {
assertEquals(i+1, output.get(i).intValue());
}
}
@Test
public void testToArray() {
final String[] array = Arrays.asList("2", "3", "1").stream().collect(Streams.toArray(String.class));
assertNotNull(array);
assertEquals(3, array.length);
assertEquals("2", array[0]);
assertEquals("3", array[1]);
assertEquals("1", array[2]);
}
protected <T extends Throwable> FailableConsumer<String, T> asIntConsumer(final T pThrowable) {
return s -> {
final int i = Integer.parseInt(s);
if (i == 4) {
throw pThrowable;
}
};
}
@TestFactory
public Stream<DynamicTest> simpleStreamForEachFailing() {
final List<String> input = Arrays.asList("1", "2", "3", "4", "5", "6");
return Stream.of(
dynamicTest("IllegalArgumentException", () -> {
final IllegalArgumentException ise = new IllegalArgumentException();
final Executable testMethod = () -> Functions.stream(input)
.forEach(asIntConsumer(ise));
final IllegalArgumentException thrown = assertThrows(IllegalArgumentException.class, testMethod);
assertThat(thrown.getMessage(), is(nullValue()));
}),
dynamicTest("OutOfMemoryError", () -> {
final OutOfMemoryError oome = new OutOfMemoryError();
final Executable oomeTestMethod = () -> Functions.stream(input)
.forEach(asIntConsumer(oome));
final OutOfMemoryError oomeThrown = assertThrows(OutOfMemoryError.class, oomeTestMethod);
assertThat(oomeThrown.getMessage(), is(nullValue()));
}),
dynamicTest("SAXException", () -> {
final SAXException se = new SAXException();
final Executable seTestMethod = () -> Functions.stream(input)
.forEach(asIntConsumer(se));
final UndeclaredThrowableException seThrown = assertThrows(UndeclaredThrowableException.class, seTestMethod);
assertAll(
() -> assertThat(seThrown.getMessage(), is(nullValue())),
() -> assertThat(seThrown.getCause(), is(equalTo(se)))
);
})
);
}
@Test
public void testSimpleStreamFilter() {
final List<String> input = Arrays.asList("1", "2", "3", "4", "5", "6");
final List<Integer> output = Functions.stream(input)
.map(Integer::valueOf)
.filter(i -> (i.intValue() %2 == 0))
.collect(Collectors.toList());
assertEvenNumbers(output);
}
private void assertEvenNumbers(final List<Integer> output) {
assertEquals(3, output.size());
for (int i = 0; i < 3; i++) {
assertEquals((i+1)*2, output.get(i).intValue());
}
}
protected <T extends Throwable> FailablePredicate<Integer, T> asIntPredicate(final T pThrowable) {
return i -> {
if (i.intValue() == 5 && pThrowable != null) {
throw pThrowable;
}
return i%2==0;
};
}
@TestFactory
public Stream<DynamicTest> simpleStreamFilterFailing() {
final List<String> input = Arrays.asList("1", "2", "3", "4", "5", "6");
final List<Integer> output = Functions.stream(input)
.map(Integer::valueOf)
.filter(asIntPredicate(null))
.collect(Collectors.toList());
assertEvenNumbers(output);
return Stream.of(
dynamicTest("IllegalArgumentException", () -> {
final IllegalArgumentException iae = new IllegalArgumentException("Invalid argument: " + 5);
final Executable testMethod = () -> Functions.stream(input)
.map(Integer::valueOf)
.filter(asIntPredicate(iae))
.collect(Collectors.toList());
final IllegalArgumentException thrown = assertThrows(IllegalArgumentException.class, testMethod);
assertThat(thrown.getMessage(), is(equalTo("Invalid argument: " + 5)));
}),
dynamicTest("OutOfMemoryError", () -> {
final OutOfMemoryError oome = new OutOfMemoryError();
final Executable testMethod = () -> Functions.stream(input)
.map(Integer::valueOf)
.filter(asIntPredicate(oome))
.collect(Collectors.toList());
final OutOfMemoryError thrown = assertThrows(OutOfMemoryError.class, testMethod);
assertThat(thrown.getMessage(), is(nullValue()));
}),
dynamicTest("SAXException", () -> {
final SAXException se = new SAXException();
final Executable testMethod = () -> Functions.stream(input)
.map(Integer::valueOf)
.filter(asIntPredicate(se))
.collect(Collectors.toList());
final UndeclaredThrowableException thrown = assertThrows(UndeclaredThrowableException.class, testMethod);
assertAll(
() -> assertThat(thrown.getMessage(), is(nullValue())),
() -> assertThat(thrown.getCause(), is(equalTo(se)))
);
})
);
}
}
|
