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// Copyright 2014 Google Inc. 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 static org.junit.Assert.assertEquals;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
/**
* 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();
assertEquals("Prefix: We'll flush after this line.\n",
string(out.toByteArray()));
}
@Test
public void testAutoflushUponNewline() throws IOException {
prefixOut.write(bytes("Hello, newline.\n"));
assertEquals("Prefix: Hello, newline.\n", string(out.toByteArray()));
}
@Test
public void testAutoflushUponEmbeddedNewLine() throws IOException {
prefixOut.write(bytes("Hello line1.\nHello line2.\nHello line3.\n"));
assertEquals(
"Prefix: Hello line1.\nPrefix: Hello line2.\nPrefix: Hello line3.\n",
string(out.toByteArray()));
}
@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"));
assertEquals("Prefix: " + junk + "\n" + "Prefix: " + junk + "\n"
+ "Prefix: " + junk + "\n" + "Prefix: " + junk + "\n",
string(out.toByteArray()));
}
}
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