Add OutputCapture test class
Phillip Webb
11 years ago
parent
174427881a
commit
4038b39496
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/*
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* Copyright 2012-2013 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.PrintStream;
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import org.junit.rules.TestRule;
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import org.junit.runner.Description;
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import org.junit.runners.model.Statement;
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/**
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* Capture output from System.out and System.err.
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*
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* @author Phillip Webb
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*/
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public class OutputCapture implements TestRule {
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private CaptureOutputStream captureOut;
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private CaptureOutputStream captureErr;
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private ByteArrayOutputStream copy;
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@Override
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public Statement apply(final Statement base, Description description) {
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return new Statement() {
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@Override
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public void evaluate() throws Throwable {
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captureOutput();
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try {
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base.evaluate();
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}
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finally {
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releaseOutput();
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}
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}
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};
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}
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protected void captureOutput() {
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this.copy = new ByteArrayOutputStream();
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this.captureOut = new CaptureOutputStream(System.out, this.copy);
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this.captureErr = new CaptureOutputStream(System.err, this.copy);
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System.setOut(new PrintStream(this.captureOut));
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System.setErr(new PrintStream(this.captureErr));
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}
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protected void releaseOutput() {
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System.setOut(this.captureOut.getOriginal());
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System.setErr(this.captureErr.getOriginal());
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this.copy = null;
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}
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public String getOutputAndRelease() {
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try {
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return toString();
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}
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finally {
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releaseOutput();
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}
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}
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@Override
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public String toString() {
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return this.copy.toString();
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}
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private static class CaptureOutputStream extends OutputStream {
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private final PrintStream original;
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private final OutputStream copy;
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public CaptureOutputStream(PrintStream original, OutputStream copy) {
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this.original = original;
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this.copy = copy;
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}
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@Override
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public void write(int b) throws IOException {
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this.copy.write(b);
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this.original.write(b);
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this.original.flush();
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}
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@Override
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public void write(byte[] b) throws IOException {
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write(b, 0, b.length);
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}
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@Override
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public void write(byte[] b, int off, int len) throws IOException {
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this.copy.write(b, off, len);
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this.original.write(b, off, len);
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this.original.flush();
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}
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public PrintStream getOriginal() {
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return this.original;
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}
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}
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}
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