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JUnit is a regression testing framework written by Erich Gamma and Kent Beck. It is used by the developer who implements unit tests in Java.

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package org.junit.experimental.results;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.util.List;

import org.junit.internal.TextListener;
import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;

/**
 * A test result that prints nicely in error messages.
 * This is only intended to be used in JUnit self-tests.
 * For example:
 * 
 *  *    assertThat(testResult(HasExpectedException.class), isSuccessful());
 * 
 */
public class PrintableResult {
	/**
	 * The result of running JUnit on {@code type}
	 */
	public static PrintableResult testResult(Class type) {
		return new PrintableResult(type);
	}
	
	private Result result;

	/**
	 * A result that includes the given {@code failures}
	 */
	public PrintableResult(List failures) {
		this(new FailureList(failures).result());
	}

	private PrintableResult(Result result) {
		this.result = result;
	}
	
	private PrintableResult(Class type) {
		this(JUnitCore.runClasses(type));
	}

	@Override
	public String toString() {
		ByteArrayOutputStream stream = new ByteArrayOutputStream();
		new TextListener(new PrintStream(stream)).testRunFinished(result);
		return stream.toString();
	}

	/**
	 * Returns the number of failures in this result.
	 */
	public int failureCount() {
		return result.getFailures().size();
	}
}