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345 changes: 345 additions & 0 deletions exercises/practice/rational-numbers/src/test/java/RationalTest
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import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.Test;

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

public class RationalTest {

// Helper methods

private static final double DOUBLE_EQUALITY_TOLERANCE = 1e-8;

private void assertDoublesEqual(double x, double y) {
assertThat(x).isCloseTo(y, within(DOUBLE_EQUALITY_TOLERANCE));
}

// Tests

@Test
public void testAddTwoPositiveRationalNumbers() {
Rational expected = new Rational(7, 6);
Rational actual = new Rational(1, 2).add(new Rational(2, 3));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testAddAPositiveRationalNumberAndANegativeRationalNumber() {
Rational expected = new Rational(-1, 6);
Rational actual = new Rational(1, 2).add(new Rational(-2, 3));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testAddTwoNegativeRationalNumbers() {
Rational expected = new Rational(-7, 6);
Rational actual = new Rational(-1, 2).add(new Rational(-2, 3));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testAddARationalNumberToItsAdditiveInverse() {
Rational expected = new Rational(0, 1);
Rational actual = new Rational(1, 2).add(new Rational(-1, 2));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testSubtractTwoPositiveRationalNumbers() {
Rational expected = new Rational(-1, 6);
Rational actual = new Rational(1, 2).subtract(new Rational(2, 3));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testSubtractAPositiveRationalNumberAndANegativeRationalNumber() {
Rational expected = new Rational(7, 6);
Rational actual = new Rational(1, 2).subtract(new Rational(-2, 3));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testSubtractTwoNegativeRationalNumbers() {
Rational expected = new Rational(1, 6);
Rational actual = new Rational(-1, 2).subtract(new Rational(-2, 3));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testSubtractARationalNumberFromItself() {
Rational expected = new Rational(0, 1);
Rational actual = new Rational(1, 2).subtract(new Rational(1, 2));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testMultiplyTwoPositiveRationalNumbers() {
Rational expected = new Rational(1, 3);
Rational actual = new Rational(1, 2).multiply(new Rational(2, 3));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testMultiplyANegativeRationalNumberByAPositiveRationalNumber() {
Rational expected = new Rational(-1, 3);
Rational actual = new Rational(-1, 2).multiply(new Rational(2, 3));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testMultiplyTwoNegativeRationalNumbers() {
Rational expected = new Rational(1, 3);
Rational actual = new Rational(-1, 2).multiply(new Rational(-2, 3));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testMultiplyARationalNumberByItsReciprocal() {
Rational expected = new Rational(1, 1);
Rational actual = new Rational(1, 2).multiply(new Rational(2, 1));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testMultiplyARationalNumberByOne() {
Rational expected = new Rational(1, 2);
Rational actual = new Rational(1, 2).multiply(new Rational(1, 1));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testMultiplyARationalNumberByZero() {
Rational expected = new Rational(0, 1);
Rational actual = new Rational(1, 2).multiply(new Rational(0, 1));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testDivideTwoPositiveRationalNumbers() {
Rational expected = new Rational(3, 4);
Rational actual = new Rational(1, 2).divide(new Rational(2, 3));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testDivideAPositiveRationalNumberByANegativeRationalNumber() {
Rational expected = new Rational(-3, 4);
Rational actual = new Rational(1, 2).divide(new Rational(-2, 3));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testDivideTwoNegativeRationalNumbers() {
Rational expected = new Rational(3, 4);
Rational actual = new Rational(-1, 2).divide(new Rational(-2, 3));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testDivideARationalNumberByOne() {
Rational expected = new Rational(1, 2);
Rational actual = new Rational(1, 2).divide(new Rational(1, 1));
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testAbsoluteValueOfAPositiveRationalNumber() {
Rational expected = new Rational(1, 2);
Rational actual = new Rational(1, 2).abs();
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testAbsoluteValueOfAPositiveRationalNumberWithNegativeNumeratorAndDenominator() {
Rational expected = new Rational(1, 2);
Rational actual = new Rational(-1, -2).abs();
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testAbsoluteValueOfANegativeRationalNumber() {
Rational expected = new Rational(1, 2);
Rational actual = new Rational(-1, 2).abs();
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testAbsoluteValueOfANegativeRationalNumberWithNegativeDenominator() {
Rational expected = new Rational(1, 2);
Rational actual = new Rational(1, -2).abs();
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testAbsoluteValueOfZero() {
Rational expected = new Rational(0, 1);
Rational actual = new Rational(0, 1).abs();
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testAbsoluteValueOfARationalNumberIsReducedToLowestTerms() {
Rational expected = new Rational(1, 2);
Rational actual = new Rational(2, 4).abs();
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testRaiseAPositiveRationalNumberToAPositiveIntegerPower() {
Rational expected = new Rational(1, 8);
Rational actual = new Rational(1, 2).pow(3);
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testRaiseANegativeRationalNumberToAPositiveIntegerPower() {
Rational expected = new Rational(-1, 8);
Rational actual = new Rational(-1, 2).pow(3);
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testRaiseAPositiveRationalNumberToANegativeIntegerPower() {
Rational expected = new Rational(25, 9);
Rational actual = new Rational(3, 5).pow(-2);
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testRaiseANegativeRationalNumberToAnEvenNegativeIntegerPower() {
Rational expected = new Rational(25, 9);
Rational actual = new Rational(-3, 5).pow(-2);
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testRaiseANegativeRationalNumberToAnOddNegativeIntegerPower() {
Rational expected = new Rational(-125, 27);
Rational actual = new Rational(-3, 5).pow(-3);
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testRaiseZeroToAnIntegerPower() {
Rational expected = new Rational(0, 1);
Rational actual = new Rational(0, 1).pow(5);
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testRaiseOneToAnIntegerPower() {
Rational expected = new Rational(1, 1);
Rational actual = new Rational(1, 1).pow(4);
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testRaiseAPositiveRationalNumberToThePowerOfZero() {
Rational expected = new Rational(1, 1);
Rational actual = new Rational(-1, 2).pow(0);
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testRaiseARealNumberToAPositiveRationalNumber() {
double expected = 16.0;
double actual = new Rational(4, 3).exp(8.0);
assertDoublesEqual(expected, actual);
}

@Disabled("Remove to run test")
@Test
public void testRaiseARealNumberToANegativeRationalNumber() {
double expected = 1.0 / 3;
double actual = new Rational(-1, 2).exp(9);
assertDoublesEqual(expected, actual);
}

@Disabled("Remove to run test")
@Test
public void testReduceAPositiveRationalNumberToLowestTerms() {
Rational expected = new Rational(1, 2);
Rational actual = new Rational(2, 4);
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testReducePlacesTheMinusSignOnTheNumerator() {
Rational expected = new Rational(-3, 4);
Rational actual = new Rational(3, -4);
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testReduceANegativeRationalNumberToLowestTerms() {
Rational expected = new Rational(-2, 3);
Rational actual = new Rational(-4, 6);
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testReduceARationalNumberWithANegativeDenominatorToLowestTerms() {
Rational expected = new Rational(-1, 3);
Rational actual = new Rational(3, -9);
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testReduceZeroToLowestTerms() {
Rational expected = new Rational(0, 1);
Rational actual = new Rational(0, 6);
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testReduceAnIntegerToLowestTerms() {
Rational expected = new Rational(-2, 1);
Rational actual = new Rational(-14, 7);
assertThat(actual).isEqualTo(expected);
}

@Disabled("Remove to run test")
@Test
public void testReduceOneToLowestTerms() {
Rational expected = new Rational(1, 1);
Rational actual = new Rational(13, 13);
assertThat(actual).isEqualTo(expected);
}
}