| // Copyright 2014 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.util.io; |
| |
| import static com.google.common.truth.Truth.assertThat; |
| import static java.nio.charset.StandardCharsets.UTF_8; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| |
| /** |
| * Tests {@link LinePrefixingOutputStream}. |
| */ |
| @RunWith(JUnit4.class) |
| public class LinePrefixingOutputStreamTest { |
| |
| private byte[] bytes(String string) { |
| return string.getBytes(UTF_8); |
| } |
| |
| private String string(byte[] bytes) { |
| return new String(bytes, UTF_8); |
| } |
| |
| private ByteArrayOutputStream out = new ByteArrayOutputStream(); |
| private LinePrefixingOutputStream prefixOut = |
| new LinePrefixingOutputStream("Prefix: ", out); |
| |
| @Test |
| public void testNoOutputUntilNewline() throws IOException { |
| prefixOut.write(bytes("We won't be seeing any output.")); |
| assertThat(string(out.toByteArray())).isEmpty(); |
| } |
| |
| @Test |
| public void testOutputIfFlushed() throws IOException { |
| prefixOut.write(bytes("We'll flush after this line.")); |
| prefixOut.flush(); |
| assertThat(string(out.toByteArray())).isEqualTo("Prefix: We'll flush after this line.\n"); |
| } |
| |
| @Test |
| public void testAutoflushUponNewline() throws IOException { |
| prefixOut.write(bytes("Hello, newline.\n")); |
| assertThat(string(out.toByteArray())).isEqualTo("Prefix: Hello, newline.\n"); |
| } |
| |
| @Test |
| public void testAutoflushUponEmbeddedNewLine() throws IOException { |
| prefixOut.write(bytes("Hello line1.\nHello line2.\nHello line3.\n")); |
| assertThat(string(out.toByteArray())) |
| .isEqualTo("Prefix: Hello line1.\nPrefix: Hello line2.\nPrefix: Hello line3.\n"); |
| } |
| |
| @Test |
| public void testBufferMaxLengthFlush() throws IOException { |
| String junk = "lots of characters of non-newline junk. "; |
| while (junk.length() < LineFlushingOutputStream.BUFFER_LENGTH) { |
| junk = junk + junk; |
| } |
| junk = junk.substring(0, LineFlushingOutputStream.BUFFER_LENGTH); |
| |
| // Also test bug where write on a full buffer blows up |
| prefixOut.write(bytes(junk + junk)); |
| prefixOut.write(bytes(junk + junk)); |
| prefixOut.write(bytes("x")); |
| assertThat(string(out.toByteArray())).isEqualTo("Prefix: " + junk + "\nPrefix: " + junk |
| + "\nPrefix: " + junk + "\nPrefix: " + junk + "\n"); |
| } |
| } |