/
OutputCaptureTests.java
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/
OutputCaptureTests.java
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/*
* Copyright 2012-2020 the original author or authors.
*
* 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
*
* https://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 org.springframework.boot.test.system;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.util.NoSuchElementException;
import java.util.function.Predicate;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
/**
* Tests for {@link OutputCapture}.
*
* @author Phillip Webb
*/
class OutputCaptureTests {
private PrintStream originalOut;
private PrintStream originalErr;
private TestPrintStream systemOut;
private TestPrintStream systemErr;
private TestOutputCapture output = new TestOutputCapture();
@BeforeEach
void replaceSystemStreams() {
this.originalOut = System.out;
this.originalErr = System.err;
this.systemOut = new TestPrintStream();
this.systemErr = new TestPrintStream();
System.setOut(this.systemOut);
System.setErr(this.systemErr);
}
@AfterEach
void restoreSystemStreams() {
System.setOut(this.originalOut);
System.setErr(this.originalErr);
}
@Test
void pushWhenEmptyStartsCapture() {
System.out.print("A");
this.output.push();
System.out.print("B");
assertThat(this.output).isEqualTo("B");
}
@Test
void pushWhenHasExistingStartsNewCapture() {
System.out.print("A");
this.output.push();
System.out.print("B");
this.output.push();
System.out.print("C");
assertThat(this.output).isEqualTo("BC");
}
@Test
void popWhenEmptyThrowsException() {
assertThatExceptionOfType(NoSuchElementException.class).isThrownBy(this.output::pop);
}
@Test
void popWhenHasExistingEndsCapture() {
this.output.push();
System.out.print("A");
this.output.pop();
System.out.print("B");
assertThat(this.systemOut.toString()).isEqualTo("AB");
}
@Test
void captureAlsoWritesToSystemOut() {
this.output.push();
System.out.print("A");
assertThat(this.systemOut.toString()).isEqualTo("A");
}
@Test
void captureAlsoWritesToSystemErr() {
this.output.push();
System.err.print("A");
assertThat(this.systemErr.toString()).isEqualTo("A");
}
@Test
void lengthReturnsCapturedLength() {
this.output.push();
System.out.print("ABC");
assertThat(this.output.length()).isEqualTo(3);
}
@Test
void charAtReturnsCapturedCharAt() {
this.output.push();
System.out.print("ABC");
assertThat(this.output.charAt(1)).isEqualTo('B');
}
@Test
void subSequenceReturnsCapturedSubSequence() {
this.output.push();
System.out.print("ABC");
assertThat(this.output.subSequence(1, 3)).isEqualTo("BC");
}
@Test
void getAllReturnsAllCapturedOutput() {
pushAndPrint();
assertThat(this.output.getAll()).isEqualTo("ABC");
}
@Test
void toStringReturnsAllCapturedOutput() {
pushAndPrint();
assertThat(this.output.toString()).isEqualTo("ABC");
}
@Test
void getErrReturnsOnlyCapturedErrOutput() {
pushAndPrint();
assertThat(this.output.getErr()).isEqualTo("B");
}
@Test
void getOutReturnsOnlyCapturedOutOutput() {
pushAndPrint();
assertThat(this.output.getOut()).isEqualTo("AC");
}
@Test
void getAllUsesCache() {
pushAndPrint();
for (int i = 0; i < 10; i++) {
assertThat(this.output.getAll()).isEqualTo("ABC");
}
assertThat(this.output.buildCount).isEqualTo(1);
System.out.print("X");
assertThat(this.output.getAll()).isEqualTo("ABCX");
assertThat(this.output.buildCount).isEqualTo(2);
}
@Test
void getOutUsesCache() {
pushAndPrint();
for (int i = 0; i < 10; i++) {
assertThat(this.output.getOut()).isEqualTo("AC");
}
assertThat(this.output.buildCount).isEqualTo(1);
System.out.print("X");
assertThat(this.output.getOut()).isEqualTo("ACX");
assertThat(this.output.buildCount).isEqualTo(2);
}
@Test
void getErrUsesCache() {
pushAndPrint();
for (int i = 0; i < 10; i++) {
assertThat(this.output.getErr()).isEqualTo("B");
}
assertThat(this.output.buildCount).isEqualTo(1);
System.err.print("X");
assertThat(this.output.getErr()).isEqualTo("BX");
assertThat(this.output.buildCount).isEqualTo(2);
}
private void pushAndPrint() {
this.output.push();
System.out.print("A");
System.err.print("B");
System.out.print("C");
}
static class TestPrintStream extends PrintStream {
TestPrintStream() {
super(new ByteArrayOutputStream());
}
@Override
public String toString() {
return this.out.toString();
}
}
static class TestOutputCapture extends OutputCapture {
int buildCount;
@Override
String build(Predicate<Type> filter) {
this.buildCount++;
return super.build(filter);
}
}
}