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JUnit is a unit testing framework for Java, created by Erich Gamma and Kent Beck.

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package org.junit.rules;

import static org.junit.Assert.assertThat;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;

import org.hamcrest.Matcher;
import org.junit.runners.model.MultipleFailureException;

/**
 * The ErrorCollector rule allows execution of a test to continue after the
 * first problem is found (for example, to collect _all_ the incorrect rows in a
 * table, and report them all at once):
 *
 *  * public static class UsesErrorCollectorTwice {
 * 	@Rule
 * 	public ErrorCollector collector= new ErrorCollector();
 *
 * @Test
 * public void example() {
 *      collector.addError(new Throwable("first thing went wrong"));
 *      collector.addError(new Throwable("second thing went wrong"));
 *      collector.checkThat(getResult(), not(containsString("ERROR!")));
 *      // all lines will run, and then a combined failure logged at the end.
 *     }
 * }
 * 
 *
 * @since 4.7
 */
public class ErrorCollector extends Verifier {
    private List errors = new ArrayList();

    @Override
    protected void verify() throws Throwable {
        MultipleFailureException.assertEmpty(errors);
    }

    /**
     * Adds a Throwable to the table.  Execution continues, but the test will fail at the end.
     */
    public void addError(Throwable error) {
        errors.add(error);
    }

    /**
     * Adds a failure to the table if {@code matcher} does not match {@code value}.
     * Execution continues, but the test will fail at the end if the match fails.
     */
    public  void checkThat(final T value, final Matcher matcher) {
        checkThat("", value, matcher);
    }

    /**
     * Adds a failure with the given {@code reason}
     * to the table if {@code matcher} does not match {@code value}.
     * Execution continues, but the test will fail at the end if the match fails.
     */
    public  void checkThat(final String reason, final T value, final Matcher matcher) {
        checkSucceeds(new Callable