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package org.junit.experimental.results;

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

/**
 * Matchers on a PrintableResult, to enable JUnit self-tests.
 * For example:
 *
 * 
 * assertThat(testResult(HasExpectedException.class), isSuccessful());
 * 

 */
public class ResultMatchers {
    /**
     * Matches if the tests are all successful
     */
    public static Matcher isSuccessful() {
        return failureCountIs(0);
    }

    /**
     * Matches if there are {@code count} failures
     */
    public static Matcher failureCountIs(final int count) {
        return new TypeSafeMatcher() {
            public void describeTo(Description description) {
                description.appendText("has " + count + " failures");
            }

            @Override
            public boolean matchesSafely(PrintableResult item) {
                return item.failureCount() == count;
            }
        };
    }

    /**
     * Matches if the result has exactly one failure, and it contains {@code string}
     */
    public static Matcher hasSingleFailureContaining(final String string) {
        return new BaseMatcher() {
            public boolean matches(Object item) {
                return item.toString().contains(string) && failureCountIs(1).matches(item);
            }

            public void describeTo(Description description) {
                description.appendText("has single failure containing " + string);
            }
        };
    }

    /**
     * Matches if the result has one or more failures, and at least one of them
     * contains {@code string}
     */
    public static Matcher hasFailureContaining(final String string) {
        return new BaseMatcher() {
            public boolean matches(Object item) {
                return item.toString().contains(string);
            }

            public void describeTo(Description description) {
                description.appendText("has failure containing " + string);
            }
        };
    }
}
 















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