mailbox/api/src/test/java/org/apache/james/mailbox/MessageUidTest.java

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package org.apache.james.mailbox;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatThrownBy;

import org.junit.jupiter.api.Test;

class MessageUidTest {
    
    private static final MessageUid _1 = MessageUid.of(1);
    private static final MessageUid _2 = MessageUid.of(2);
    private static final MessageUid _3 = MessageUid.of(3);
    private static final MessageUid _4 = MessageUid.of(4);

    @Test
    void distanceShouldReturnZeroWhenSameValue() {
        assertThat(_1.distance(_1)).isEqualTo(0);
    }

    @Test
    void distanceShouldThrowWhenNullArgument() {
        assertThatThrownBy(() -> _1.distance(null))
            .isInstanceOf(NullPointerException.class);
    }


    @Test
    void distanceShouldReturnPositiveDistanceWhenGreaterArgument() {
        assertThat(_1.distance(_4)).isEqualTo(3);
    }
    
    @Test
    void distanceShouldReturnNegativeDistanceWhenSmallerArgument() {
        assertThat(_3.distance(_2)).isEqualTo(-1);
    }
}