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Changes in RationalTest
Changes float tolerance from 2e-15 to 1e-8 as told in (#2889)
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‎exercises/practice/rational-numbers/src/test/java/RationalTest‎

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import org.junit.jupiter.api.Disabled;
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import org.junit.jupiter.api.Test;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.assertj.core.api.Assertions.within;
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public class RationalTest {
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// Helper methods
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private static final double DOUBLE_EQUALITY_TOLERANCE = 1e-8;
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private void assertDoublesEqual(double x, double y) {
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assertThat(x).isCloseTo(y, within(DOUBLE_EQUALITY_TOLERANCE));
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}
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// Tests
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@Test
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public void testAddTwoPositiveRationalNumbers() {
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Rational expected = new Rational(7, 6);
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Rational actual = new Rational(1, 2).add(new Rational(2, 3));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testAddAPositiveRationalNumberAndANegativeRationalNumber() {
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Rational expected = new Rational(-1, 6);
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Rational actual = new Rational(1, 2).add(new Rational(-2, 3));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testAddTwoNegativeRationalNumbers() {
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Rational expected = new Rational(-7, 6);
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Rational actual = new Rational(-1, 2).add(new Rational(-2, 3));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testAddARationalNumberToItsAdditiveInverse() {
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Rational expected = new Rational(0, 1);
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Rational actual = new Rational(1, 2).add(new Rational(-1, 2));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testSubtractTwoPositiveRationalNumbers() {
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Rational expected = new Rational(-1, 6);
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Rational actual = new Rational(1, 2).subtract(new Rational(2, 3));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testSubtractAPositiveRationalNumberAndANegativeRationalNumber() {
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Rational expected = new Rational(7, 6);
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Rational actual = new Rational(1, 2).subtract(new Rational(-2, 3));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testSubtractTwoNegativeRationalNumbers() {
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Rational expected = new Rational(1, 6);
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Rational actual = new Rational(-1, 2).subtract(new Rational(-2, 3));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testSubtractARationalNumberFromItself() {
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Rational expected = new Rational(0, 1);
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Rational actual = new Rational(1, 2).subtract(new Rational(1, 2));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testMultiplyTwoPositiveRationalNumbers() {
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Rational expected = new Rational(1, 3);
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Rational actual = new Rational(1, 2).multiply(new Rational(2, 3));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testMultiplyANegativeRationalNumberByAPositiveRationalNumber() {
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Rational expected = new Rational(-1, 3);
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Rational actual = new Rational(-1, 2).multiply(new Rational(2, 3));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testMultiplyTwoNegativeRationalNumbers() {
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Rational expected = new Rational(1, 3);
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Rational actual = new Rational(-1, 2).multiply(new Rational(-2, 3));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testMultiplyARationalNumberByItsReciprocal() {
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Rational expected = new Rational(1, 1);
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Rational actual = new Rational(1, 2).multiply(new Rational(2, 1));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testMultiplyARationalNumberByOne() {
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Rational expected = new Rational(1, 2);
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Rational actual = new Rational(1, 2).multiply(new Rational(1, 1));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testMultiplyARationalNumberByZero() {
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Rational expected = new Rational(0, 1);
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Rational actual = new Rational(1, 2).multiply(new Rational(0, 1));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testDivideTwoPositiveRationalNumbers() {
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Rational expected = new Rational(3, 4);
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Rational actual = new Rational(1, 2).divide(new Rational(2, 3));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testDivideAPositiveRationalNumberByANegativeRationalNumber() {
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Rational expected = new Rational(-3, 4);
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Rational actual = new Rational(1, 2).divide(new Rational(-2, 3));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testDivideTwoNegativeRationalNumbers() {
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Rational expected = new Rational(3, 4);
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Rational actual = new Rational(-1, 2).divide(new Rational(-2, 3));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testDivideARationalNumberByOne() {
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Rational expected = new Rational(1, 2);
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Rational actual = new Rational(1, 2).divide(new Rational(1, 1));
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testAbsoluteValueOfAPositiveRationalNumber() {
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Rational expected = new Rational(1, 2);
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Rational actual = new Rational(1, 2).abs();
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testAbsoluteValueOfAPositiveRationalNumberWithNegativeNumeratorAndDenominator() {
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Rational expected = new Rational(1, 2);
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Rational actual = new Rational(-1, -2).abs();
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testAbsoluteValueOfANegativeRationalNumber() {
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Rational expected = new Rational(1, 2);
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Rational actual = new Rational(-1, 2).abs();
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testAbsoluteValueOfANegativeRationalNumberWithNegativeDenominator() {
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Rational expected = new Rational(1, 2);
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Rational actual = new Rational(1, -2).abs();
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testAbsoluteValueOfZero() {
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Rational expected = new Rational(0, 1);
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Rational actual = new Rational(0, 1).abs();
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testAbsoluteValueOfARationalNumberIsReducedToLowestTerms() {
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Rational expected = new Rational(1, 2);
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Rational actual = new Rational(2, 4).abs();
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testRaiseAPositiveRationalNumberToAPositiveIntegerPower() {
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Rational expected = new Rational(1, 8);
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Rational actual = new Rational(1, 2).pow(3);
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testRaiseANegativeRationalNumberToAPositiveIntegerPower() {
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Rational expected = new Rational(-1, 8);
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Rational actual = new Rational(-1, 2).pow(3);
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testRaiseAPositiveRationalNumberToANegativeIntegerPower() {
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Rational expected = new Rational(25, 9);
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Rational actual = new Rational(3, 5).pow(-2);
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testRaiseANegativeRationalNumberToAnEvenNegativeIntegerPower() {
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Rational expected = new Rational(25, 9);
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Rational actual = new Rational(-3, 5).pow(-2);
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testRaiseANegativeRationalNumberToAnOddNegativeIntegerPower() {
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Rational expected = new Rational(-125, 27);
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Rational actual = new Rational(-3, 5).pow(-3);
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testRaiseZeroToAnIntegerPower() {
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Rational expected = new Rational(0, 1);
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Rational actual = new Rational(0, 1).pow(5);
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testRaiseOneToAnIntegerPower() {
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Rational expected = new Rational(1, 1);
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Rational actual = new Rational(1, 1).pow(4);
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testRaiseAPositiveRationalNumberToThePowerOfZero() {
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Rational expected = new Rational(1, 1);
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Rational actual = new Rational(-1, 2).pow(0);
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testRaiseARealNumberToAPositiveRationalNumber() {
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double expected = 16.0;
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double actual = new Rational(4, 3).exp(8.0);
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assertDoublesEqual(expected, actual);
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}
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@Disabled("Remove to run test")
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@Test
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public void testRaiseARealNumberToANegativeRationalNumber() {
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double expected = 1.0 / 3;
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double actual = new Rational(-1, 2).exp(9);
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assertDoublesEqual(expected, actual);
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}
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@Disabled("Remove to run test")
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@Test
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public void testReduceAPositiveRationalNumberToLowestTerms() {
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Rational expected = new Rational(1, 2);
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Rational actual = new Rational(2, 4);
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testReducePlacesTheMinusSignOnTheNumerator() {
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Rational expected = new Rational(-3, 4);
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Rational actual = new Rational(3, -4);
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testReduceANegativeRationalNumberToLowestTerms() {
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Rational expected = new Rational(-2, 3);
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Rational actual = new Rational(-4, 6);
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testReduceARationalNumberWithANegativeDenominatorToLowestTerms() {
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Rational expected = new Rational(-1, 3);
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Rational actual = new Rational(3, -9);
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testReduceZeroToLowestTerms() {
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Rational expected = new Rational(0, 1);
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Rational actual = new Rational(0, 6);
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testReduceAnIntegerToLowestTerms() {
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Rational expected = new Rational(-2, 1);
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Rational actual = new Rational(-14, 7);
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assertThat(actual).isEqualTo(expected);
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}
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@Disabled("Remove to run test")
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@Test
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public void testReduceOneToLowestTerms() {
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Rational expected = new Rational(1, 1);
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Rational actual = new Rational(13, 13);
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assertThat(actual).isEqualTo(expected);
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}
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}

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