MeanMedianModeTest.java

package by.andd3dfx.numeric;

import org.junit.Test;

import static by.andd3dfx.numeric.MeanMedianMode.mean;
import static by.andd3dfx.numeric.MeanMedianMode.median;
import static by.andd3dfx.numeric.MeanMedianMode.mode;
import static by.andd3dfx.numeric.MeanMedianMode.quartile1;
import static by.andd3dfx.numeric.MeanMedianMode.quartile2;
import static by.andd3dfx.numeric.MeanMedianMode.quartile3;
import static org.assertj.core.api.Assertions.assertThat;

public class MeanMedianModeTest {

    @Test
    public void testMean() {
        assertThat(mean(new int[]{2, 2, 2, 2, 2})).isEqualTo(2.0);
        assertThat(mean(new int[]{1, 2, 3, 4})).isEqualTo(2.5);
        assertThat(mean(new int[]{1, 2, 3, 8})).isEqualTo(3.5);
    }

    @Test
    public void testMedian() {
        assertThat(median(new int[]{2, 2, 2, 2, 2})).isEqualTo(2.0);
        assertThat(median(new int[]{1, 2, 3, 4})).isEqualTo(2.5);
        assertThat(median(new int[]{1, 2, 3, 8})).isEqualTo(2.5);
    }

    @Test
    public void testMode() {
        assertThat(mode(new int[]{1, 1, 1, 1})).isEqualTo(1.0);
        assertThat(mode(new int[]{1, 2, 3, 4})).isEqualTo(1.0);
        assertThat(mode(new int[]{1, 3, 3, 2, 5, 9})).isEqualTo(3.0);
        assertThat(mode(new int[]{1, 3, 3, 2, 5, 2, 9})).isEqualTo(2.0);
    }

    @Test
    public void testQuartile1() {
        assertThat(quartile1(new int[]{1, 1, 1, 1})).isEqualTo(1.0);
        assertThat(quartile1(new int[]{5, 6, 7, 8, 1, 2, 3, 4})).isEqualTo(2.5);
    }

    @Test
    public void testQuartile2() {
        assertThat(quartile2(new int[]{1, 1, 1, 1})).isEqualTo(1.0);
        assertThat(quartile2(new int[]{5, 6, 7, 8, 1, 2, 3, 4})).isEqualTo(4.5);
    }

    @Test
    public void testQuartile3() {
        assertThat(quartile3(new int[]{1, 1, 1, 1})).isEqualTo(1.0);
        assertThat(quartile3(new int[]{5, 6, 7, 8, 1, 2, 3, 4})).isEqualTo(6.5);
    }
}