majority-judgment-library-java/src/test/java/fr/mieuxvoter/mj/ProposalTallyAnalysisTest.java

package fr.mieuxvoter.mj;

import static org.junit.jupiter.api.Assertions.*;

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;

import java.math.BigInteger;
import java.util.stream.Stream;

// CTRL+F11 in Eclipse to run

class ProposalTallyAnalysisTest {

    @DisplayName("Test the proposal tally analysis")
    @ParameterizedTest(name = "#{index} {0} ; tally = {1}")
    @MethodSource("testProvider")
    void test(
            String testName,
            Integer[] rawTally,
            Integer medianGrade,
            BigInteger medianGroupSize,
            Integer contestationGrade,
            BigInteger contestationGroupSize,
            Integer adhesionGrade,
            BigInteger adhesionGroupSize,
            Integer secondMedianGrade,
            BigInteger secondMedianGroupSize,
            Integer secondMedianGroupSign) {
        ProposalTally tally = new ProposalTally(rawTally);
        ProposalTallyAnalysis pta = new ProposalTallyAnalysis(tally);
        assertEquals(medianGrade, pta.getMedianGrade(), "Median Grade");
        assertEquals(medianGroupSize, pta.getMedianGroupSize(), "Median Group Size");
        assertEquals(contestationGrade, pta.getContestationGrade(), "Contestation Grade");
        assertEquals(
                contestationGroupSize, pta.getContestationGroupSize(), "Contestation Group Size");
        assertEquals(adhesionGrade, pta.getAdhesionGrade(), "Adhesion Grade");
        assertEquals(adhesionGroupSize, pta.getAdhesionGroupSize(), "Adhesion Group Size");
        assertEquals(secondMedianGrade, pta.getSecondMedianGrade(), "Second Median Grade");
        assertEquals(
                secondMedianGroupSize, pta.getSecondMedianGroupSize(), "Second Median Group Size");
        assertEquals(
                secondMedianGroupSign, pta.getSecondMedianGroupSign(), "Second Median Group Sign");
    }

    protected static Stream<Arguments> testProvider() {
        return Stream.of(
                Arguments.of(
                        /* name */ "Very empty tallies yield zeroes",
                        /* tally */ new Integer[] {0},
                        /* medianGrade */ 0,
                        /* medianGroupSize */ BigInteger.ZERO,
                        /* contestationGrade */ 0,
                        /* contestationGroupSize */ BigInteger.ZERO,
                        /* adhesionGrade */ 0,
                        /* adhesionGroupSize */ BigInteger.ZERO,
                        /* secondMedianGrade */ 0,
                        /* secondMedianGroupSize */ BigInteger.ZERO,
                        /* secondMedianGroupSign */ 0),
                Arguments.of(
                        /* name */ "Empty tallies yield zeroes",
                        /* tally */ new Integer[] {0, 0, 0, 0},
                        /* medianGrade */ 0,
                        /* medianGroupSize */ BigInteger.ZERO,
                        /* contestationGrade */ 0,
                        /* contestationGroupSize */ BigInteger.ZERO,
                        /* adhesionGrade */ 0,
                        /* adhesionGroupSize */ BigInteger.ZERO,
                        /* secondMedianGrade */ 0,
                        /* secondMedianGroupSize */ BigInteger.ZERO,
                        /* secondMedianGroupSign */ 0),
                Arguments.of(
                        /* name */ "Absurd tally of 1 Grade",
                        /* tally */ new Integer[] {7},
                        /* medianGrade */ 0,
                        /* medianGroupSize */ BigInteger.valueOf(7),
                        /* contestationGrade */ 0,
                        /* contestationGroupSize */ BigInteger.ZERO,
                        /* adhesionGrade */ 0,
                        /* adhesionGroupSize */ BigInteger.ZERO,
                        /* secondMedianGrade */ 0,
                        /* secondMedianGroupSize */ BigInteger.ZERO,
                        /* secondMedianGroupSign */ 0),
                Arguments.of(
                        /* name */ "Approbation",
                        /* tally */ new Integer[] {31, 72},
                        /* medianGrade */ 1,
                        /* medianGroupSize */ BigInteger.valueOf(72),
                        /* contestationGrade */ 0,
                        /* contestationGroupSize */ BigInteger.valueOf(31),
                        /* adhesionGrade */ 0,
                        /* adhesionGroupSize */ BigInteger.ZERO,
                        /* secondMedianGrade */ 0,
                        /* secondMedianGroupSize */ BigInteger.valueOf(31),
                        /* secondMedianGroupSign */ -1),
                Arguments.of(
                        /* name */ "Equality favors contestation",
                        /* tally */ new Integer[] {42, 42},
                        /* medianGrade */ 0,
                        /* medianGroupSize */ BigInteger.valueOf(42),
                        /* contestationGrade */ 0,
                        /* contestationGroupSize */ BigInteger.ZERO,
                        /* adhesionGrade */ 1,
                        /* adhesionGroupSize */ BigInteger.valueOf(42),
                        /* secondMedianGrade */ 1,
                        /* secondMedianGroupSize */ BigInteger.valueOf(42),
                        /* secondMedianGroupSign */ 1),
                Arguments.of(
                        /* name */ "Example with seven grades",
                        /* tally */ new Integer[] {4, 2, 0, 1, 2, 2, 3},
                        /* medianGrade */ 3,
                        /* medianGroupSize */ BigInteger.valueOf(1),
                        /* contestationGrade */ 1,
                        /* contestationGroupSize */ BigInteger.valueOf(6),
                        /* adhesionGrade */ 4,
                        /* adhesionGroupSize */ BigInteger.valueOf(7),
                        /* secondMedianGrade */ 4,
                        /* secondMedianGroupSize */ BigInteger.valueOf(7),
                        /* secondMedianGroupSign */ 1),
                Arguments.of(
                        /* name */ "Works even if multiple grades are at zero",
                        /* tally */ new Integer[] {4, 0, 0, 1, 0, 0, 4},
                        /* medianGrade */ 3,
                        /* medianGroupSize */ BigInteger.valueOf(1),
                        /* contestationGrade */ 0,
                        /* contestationGroupSize */ BigInteger.valueOf(4),
                        /* adhesionGrade */ 6,
                        /* adhesionGroupSize */ BigInteger.valueOf(4),
                        /* secondMedianGrade */ 0,
                        /* secondMedianGroupSize */ BigInteger.valueOf(4),
                        /* secondMedianGroupSign */ -1),
                Arguments.of(
                        /* name */ "Weird tally",
                        /* tally */ new Integer[] {1, 1, 1, 1, 1, 1, 1},
                        /* medianGrade */ 3,
                        /* medianGroupSize */ BigInteger.valueOf(1),
                        /* contestationGrade */ 2,
                        /* contestationGroupSize */ BigInteger.valueOf(3),
                        /* adhesionGrade */ 4,
                        /* adhesionGroupSize */ BigInteger.valueOf(3),
                        /* secondMedianGrade */ 2,
                        /* secondMedianGroupSize */ BigInteger.valueOf(3),
                        /* secondMedianGroupSign */ -1));
    }
}