52 lines
1.9 KiB
Java
52 lines
1.9 KiB
Java
package com.baeldung.stream;
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import one.util.streamex.StreamEx;
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import org.junit.Test;
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import java.util.Arrays;
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import static org.junit.Assert.assertEquals;
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public class StreamExMergeStreamsTest {
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@Test
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public void givenTwoStreams_whenMergingStreams_thenResultingStreamContainsElementsFromBothStreams() {
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StreamEx<Integer> stream1 = StreamEx.of(1, 3, 5);
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StreamEx<Integer> stream2 = StreamEx.of(2, 4, 6);
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StreamEx<Integer> resultingStream = stream1.append(stream2);
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assertEquals(Arrays.asList(1, 3, 5, 2, 4, 6),
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resultingStream.toList());
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}
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@Test
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public void givenFourStreams_whenMergingStreams_thenResultingStreamContainsElementsFromAllStreams() {
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StreamEx<Integer> stream1 = StreamEx.of(1, 3, 5);
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StreamEx<Integer> stream2 = StreamEx.of(2, 4, 6);
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StreamEx<Integer> stream3 = StreamEx.of(18, 15, 36);
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StreamEx<Integer> stream4 = StreamEx.of(99);
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StreamEx<Integer> resultingStream = stream1.append(stream2)
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.append(stream3)
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.append(stream4);
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assertEquals(Arrays.asList(1, 3, 5, 2, 4, 6, 18, 15, 36, 99),
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resultingStream.toList());
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}
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@Test
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public void givenThreeStreams_whenAppendingAndPrependingStreams_thenResultingStreamContainsElementsFromAllStreams() {
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StreamEx<String> stream1 = StreamEx.of("foo", "bar");
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StreamEx<String> openingBracketStream = StreamEx.of("[");
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StreamEx<String> closingBracketStream = StreamEx.of("]");
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StreamEx<String> resultingStream = stream1.append(closingBracketStream)
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.prepend(openingBracketStream);
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assertEquals(Arrays.asList("[", "foo", "bar", "]"),
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resultingStream.toList());
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}
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}
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