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Diffstat (limited to 'src/test/java/org/apache/commons/lang3/StreamsTest.java')
-rw-r--r-- | src/test/java/org/apache/commons/lang3/StreamsTest.java | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/src/test/java/org/apache/commons/lang3/StreamsTest.java b/src/test/java/org/apache/commons/lang3/StreamsTest.java new file mode 100644 index 000000000..fc6d30681 --- /dev/null +++ b/src/test/java/org/apache/commons/lang3/StreamsTest.java @@ -0,0 +1,201 @@ +/* + * 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))) + ); + }) + ); + } + +} |