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/*
* Copyright 2015-2023 the original author or authors.
*
* All rights reserved. This program and the accompanying materials are
* made available under the terms of the Eclipse Public License v2.0 which
* accompanies this distribution and is available at
*
* https://www.eclipse.org/legal/epl-v20.html
*/
package example.defaultmethods;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotEquals;
import org.junit.jupiter.api.Test;
// tag::user_guide[]
public interface EqualsContract<T> extends Testable<T> {
T createNotEqualValue();
@Test
default void valueEqualsItself() {
T value = createValue();
assertEquals(value, value);
}
@Test
default void valueDoesNotEqualNull() {
T value = createValue();
assertFalse(value.equals(null));
}
@Test
default void valueDoesNotEqualDifferentValue() {
T value = createValue();
T differentValue = createNotEqualValue();
assertNotEquals(value, differentValue);
assertNotEquals(differentValue, value);
}
}
// end::user_guide[]
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