MyTest.java

package org.richfaces;

import static org.hamcrest.Matchers.empty;
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;

import java.util.Arrays;
import java.util.List;

import org.junit.Test;

public class MyTest {

    private List<String> myList = Arrays.asList("a", "b", "c");

    /**
     * java.lang.AssertionError
     */
    @Test
    public void noMessage() {
        assertTrue(myList.isEmpty());
    }

    /**
     * java.lang.AssertionError: list is empty
     */
    @Test
    public void userProvidedMessage() {
        assertTrue("list is empty", myList.isEmpty());
    }

    /**
     * java.lang.AssertionError:
     *    Expected: is an empty collection
     *         but: <[a, b, c]>
     */
    @Test
    public void derivedMessage() {
        assertThat(myList, is(empty()));
    }
}