content: /*******************************************************************************
   * Copyright (c) 2009, 2019 Mountainminds GmbH & Co. KG and Contributors
   * All rights reserved. This program and the accompanying materials
   * are made available under the terms of the Eclipse Public License v1.0
   * which accompanies this distribution, and is available at
   * http://www.eclipse.org/legal/epl-v10.html
   *
   * Contributors:
   *    Marc R. Hoffmann - initial API and implementation
   *    
   *******************************************************************************/
  package org.jacoco.examples;
  
  import static org.hamcrest.core.Is.is;
  import static org.junit.Assert.assertThat;
  import static org.junit.Assert.fail;
  import static org.junit.matchers.JUnitMatchers.containsString;
  
  import java.io.ByteArrayOutputStream;
  import java.io.PrintStream;
  import java.io.UnsupportedEncodingException;
  
  import org.hamcrest.Matcher;
  import org.junit.rules.ExternalResource;
  
  /**
   * In-Memory buffer to assert console output.
   */
  public class ConsoleOutput extends ExternalResource {
  
  	private final ByteArrayOutputStream buffer;
  
  	public final PrintStream stream;
  
  	public ConsoleOutput() {
  		this.buffer = new ByteArrayOutputStream();
  		try {
  			this.stream = new PrintStream(buffer, true, "UTF-8");
  		} catch (UnsupportedEncodingException e) {
  			throw new AssertionError(e.getMessage());
  		}
  	}
  
  	@Override
  	protected void after() {
  		buffer.reset();
  	}
  
  	public static Matcher<String> containsLine(String line) {
  		return containsString(String.format("%s%n", line));
  	}
  
  	public static Matcher<String> isEmpty() {
  		return is("");
  	}
  
  	public String getContents() {
  		try {
  			return new String(buffer.toByteArray(), "UTF-8");
  		} catch (UnsupportedEncodingException e) {
  			fail(e.getMessage());
  			return "";
  		}
  	}
  
  	public void expect(Matcher<String> matcher) {
  		assertThat(getContents(), matcher);
  	}
  
  }
  