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

There is a newer version: 4.13.2

package org.junit.internal.matchers;

import org.hamcrest.Description;
import org.hamcrest.Factory;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeMatcher;

public class ThrowableMessageMatcher extends
        TypeSafeMatcher {

    private final Matcher matcher;

    public ThrowableMessageMatcher(Matcher matcher) {
        this.matcher = matcher;
    }

    public void describeTo(Description description) {
        description.appendText("exception with message ");
        description.appendDescriptionOf(matcher);
    }

    @Override
    protected boolean matchesSafely(T item) {
        return matcher.matches(item.getMessage());
    }

    @Override
    protected void describeMismatchSafely(T item, Description description) {
        description.appendText("message ");
        matcher.describeMismatch(item.getMessage(), description);
    }

    @Factory
    public static  Matcher hasMessage(final Matcher matcher) {
        return new ThrowableMessageMatcher(matcher);
    }
}