// Copyright 2016 The Bazel Authors. All rights reserved. // // 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.devtools.build.lib.runtime; import static com.google.common.truth.Truth.assertThat; import static org.junit.Assert.fail; import com.google.common.base.Strings; import com.google.devtools.build.lib.testutil.Suite; import com.google.devtools.build.lib.testutil.TestSpec; import java.io.IOException; import java.io.OutputStream; import java.nio.charset.StandardCharsets; import java.util.ArrayList; import java.util.List; import org.junit.Test; import org.junit.runner.RunWith; import org.junit.runners.JUnit4; /** * Unit tests for {@link LineBufferedOutputStream} . */ @TestSpec(size = Suite.SMALL_TESTS) @RunWith(JUnit4.class) public class LineBufferedOutputStreamTest { private static class MockOutputStream extends OutputStream { private final List<String> writes = new ArrayList<>(); private boolean throwException = false; @Override public void write(int byteAsInt) throws IOException { byte b = (byte) byteAsInt; // make sure we work with bytes in comparisons write(new byte[] {b}, 0, 1); } @Override public synchronized void write(byte[] b, int off, int inlen) throws IOException { writes.add(new String(b, off, inlen, StandardCharsets.UTF_8)); if (throwException) { throwException = false; throw new IOException("thrown"); } } } private List<String> lineBuffer(String... inputs) throws Exception { MockOutputStream mockOutputStream = new MockOutputStream(); try (LineBufferedOutputStream cut = new LineBufferedOutputStream(mockOutputStream, 6)) { for (String input : inputs) { cut.write(input.getBytes(StandardCharsets.UTF_8)); } } return mockOutputStream.writes; } @Test public void testLineBuffering() throws Exception { String large = Strings.repeat("a", 100); assertThat(lineBuffer("foo\nbar")).containsExactly("foo\n", "bar"); assertThat(lineBuffer("foobarfoobar")).containsExactly("foobar", "foobar"); assertThat(lineBuffer("fivey\none\n")).containsExactly("fivey\n", "one\n"); assertThat(lineBuffer("sixish\none\n")).containsExactly("sixish", "\n", "one\n"); assertThat(lineBuffer("s")).containsExactly("s"); assertThat(lineBuffer("\n\n\n\n")).containsExactly("\n", "\n", "\n", "\n"); assertThat(lineBuffer("foo\n\nbar\n")).containsExactly("foo\n", "\n", "bar\n"); assertThat(lineBuffer("a", "a", large, large, "a")).containsExactly( "aa", large, large, "a"); } @Test public void testIOErrorOnWrappedStream() throws Exception { MockOutputStream mos = new MockOutputStream(); LineBufferedOutputStream cut = new LineBufferedOutputStream(mos, 4); mos.throwException = true; try { cut.write("aaaa".getBytes(StandardCharsets.UTF_8)); fail("IOException expected"); } catch (IOException e) { // Expected. } cut.write("a".getBytes(StandardCharsets.UTF_8)); cut.close(); assertThat(mos.writes).containsExactly("aaaa", "a"); } }