ComparableContract.java

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package com.fermod.contract;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;

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

@DisplayName("Comparable Test")
@Tag("comparable")
public interface ComparableContract<T extends Comparable<T>> extends Testable<T> {
    
    T createSmallerValue();

    @DisplayName("Compare Itself - Return Zero")
    @Test
    default void comparedToItself() {
        T value = createValue();
        assertEquals(0, value.compareTo(value));
    }

    @DisplayName("Compare To Smaller - Return Positive Number")
    @Test
    default void compareToSmallerValue() {
        T value = createValue();
        T smallerValue = createSmallerValue();
        assertTrue(value.compareTo(smallerValue) > 0);
    }

    @DisplayName("Compare To Larger - Return Negative Number")
    @Test
    default void compareToLargerValue() {
        T value = createValue();
        T smallerValue = createSmallerValue();
        assertTrue(smallerValue.compareTo(value) < 0);
    }

}