EqualsContract.java

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package com.fermod.contract;

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.DisplayName;
import org.junit.jupiter.api.Tag;
import org.junit.jupiter.api.Test;

@DisplayName("Equals Test")
@Tag("equals")
public interface EqualsContract<T> extends Testable<T> {

    T createNotEqualValue();

    @DisplayName("Equals Itself - True")
    @Test
    default void equalValueItself() {
        T value = createValue();
        assertEquals(value, value);
    }

    @DisplayName("Equals Null - False")
    @Test
    default void notEqualNullValue() {
        T value = createValue();
        assertFalse(value.equals(null));
    }

    @DisplayName("Equals Different - False")
    @Test
    default void notEqualDifferentValue() {
        T value = createValue();
        T differentValue = createNotEqualValue();
        assertNotEquals(value, differentValue);
        assertNotEquals(differentValue, value);
    }

}