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Core API and libraries of hamcrest matcher framework.

There is a newer version: 3.0

package org.hamcrest;


public class MatcherAssert {
    public static  void assertThat(T actual, Matcher matcher) {
        assertThat("", actual, matcher);
    }
    
    public static  void assertThat(String reason, T actual, Matcher matcher) {
        if (!matcher.matches(actual)) {
            Description description = new StringDescription();
            description.appendText(reason)
                       .appendText(System.lineSeparator())
                       .appendText("Expected: ")
                       .appendDescriptionOf(matcher)
                       .appendText(System.lineSeparator())
                       .appendText("     but: ");
            matcher.describeMismatch(actual, description);
            
            throw new AssertionError(description.toString());
        }
    }
    
    public static void assertThat(String reason, boolean assertion) {
        if (!assertion) {
            throw new AssertionError(reason);
        }
    }
}