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package org.hamcrest;
import junit.framework.TestCase;
import org.junit.Assert;
public abstract class AbstractMatcherTest extends TestCase {
/**
* Create an instance of the Matcher so some generic safety-net tests can be run on it.
*/
protected abstract Matcher<?> createMatcher();
public static <T> void assertMatches(Matcher<T> matcher, T arg) {
assertMatches("Expected match, but mismatched", matcher, arg);
}
public static <T> void assertMatches(String message, Matcher<T> matcher, T arg) {
if (!matcher.matches(arg)) {
Assert.fail(message + " because: '" + mismatchDescription(matcher, arg) + "'");
}
}
public static <T> void assertDoesNotMatch(Matcher<? super T> c, T arg) {
assertDoesNotMatch("Unexpected match", c, arg);
}
public static <T> void assertDoesNotMatch(String message, Matcher<? super T> c, T arg) {
Assert.assertFalse(message, c.matches(arg));
}
public static void assertDescription(String expected, Matcher<?> matcher) {
Description description = new StringDescription();
description.appendDescriptionOf(matcher);
Assert.assertEquals("Expected description", expected, description.toString().trim());
}
public static <T> void assertMismatchDescription(String expected, Matcher<? super T> matcher, T arg) {
Assert.assertFalse("Precondition: Matcher should not match item.", matcher.matches(arg));
Assert.assertEquals("Expected mismatch description", expected, mismatchDescription(matcher, arg));
}
public static void assertNullSafe(Matcher<?> matcher) {
try {
matcher.matches(null);
}
catch (Exception e) {
Assert.fail("Matcher was not null safe");
}
}
public static void assertUnknownTypeSafe(Matcher<?> matcher) {
try {
matcher.matches(new UnknownType());
}
catch (Exception e) {
Assert.fail("Matcher was not unknown type safe");
}
}
public static <T> String mismatchDescription(Matcher<? super T> matcher, T arg) {
Description description = new StringDescription();
matcher.describeMismatch(arg, description);
return description.toString().trim();
}
public void testIsNullSafe() {
assertNullSafe(createMatcher());
}
public void testCopesWithUnknownTypes() {
assertUnknownTypeSafe(createMatcher());
}
public static class UnknownType {
}
}
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