XenoAmess commented on a change in pull request #82: URL: https://github.com/apache/commons-numbers/pull/82#discussion_r478417612
########## File path: commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/CommonsLangPortedFractionTest.java ########## @@ -0,0 +1,1148 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.commons.numbers.fraction; + +import org.junit.jupiter.api.Test; +import static org.junit.jupiter.api.Assertions.assertEquals; +import static org.junit.jupiter.api.Assertions.assertNotEquals; +import static org.junit.jupiter.api.Assertions.assertSame; +import static org.junit.jupiter.api.Assertions.assertThrows; +import static org.junit.jupiter.api.Assertions.assertTrue; + +/** + * Test cases for the {@link Fraction} class. + * + * <p>This class is ported from commons lang to demonstrate interoperability of + * the Fraction class in numbers.</p> + */ +public class CommonsLangPortedFractionTest { + + private static final int SKIP = 500; //53 + + //-------------------------------------------------------------------------- + @Test + public void testConstants() { + assertEquals(0, Fraction.ZERO.getNumerator()); + assertEquals(1, Fraction.ZERO.getDenominator()); + + assertEquals(1, Fraction.ONE.getNumerator()); + assertEquals(1, Fraction.ONE.getDenominator()); + + /* + * All these constants need not be supported. + * Users can create whatever constants they require. + * The special constants ZERO and ONE are for the additive and multiplicative identity. + * + * assertEquals(1, Fraction.ONE_HALF.getNumerator()); + * assertEquals(2, Fraction.ONE_HALF.getDenominator()); + * + * assertEquals(1, Fraction.ONE_THIRD.getNumerator()); + * assertEquals(3, Fraction.ONE_THIRD.getDenominator()); + * + * assertEquals(2, Fraction.TWO_THIRDS.getNumerator()); + * assertEquals(3, Fraction.TWO_THIRDS.getDenominator()); + * + * assertEquals(1, Fraction.ONE_QUARTER.getNumerator()); + * assertEquals(4, Fraction.ONE_QUARTER.getDenominator()); + * + * assertEquals(1, Fraction.TWO_QUARTERS.getNumerator()); + * assertEquals(2, Fraction.TWO_QUARTERS.getDenominator()); + * + * assertEquals(3, Fraction.THREE_QUARTERS.getNumerator()); + * assertEquals(4, Fraction.THREE_QUARTERS.getDenominator()); + * + * assertEquals(1, Fraction.ONE_FIFTH.getNumerator()); + * assertEquals(5, Fraction.ONE_FIFTH.getDenominator()); + * + * assertEquals(2, Fraction.TWO_FIFTHS.getNumerator()); + * assertEquals(5, Fraction.TWO_FIFTHS.getDenominator()); + * + * assertEquals(3, Fraction.THREE_FIFTHS.getNumerator()); + * assertEquals(5, Fraction.THREE_FIFTHS.getDenominator()); + * + * assertEquals(4, Fraction.FOUR_FIFTHS.getNumerator()); + * assertEquals(5, Fraction.FOUR_FIFTHS.getDenominator()); + */ + } + + @Test + public void testFactory_int_int() { + Fraction f = null; + + // zero + f = Fraction.of(0, 1); + assertEquals(0, f.getNumerator()); + assertEquals(1, f.getDenominator()); + + f = Fraction.of(0, 2); + assertEquals(0, f.getNumerator()); + assertEquals(1, f.getDenominator()); + + // normal + f = Fraction.of(1, 1); + assertEquals(1, f.getNumerator()); + assertEquals(1, f.getDenominator()); + + f = Fraction.of(2, 1); + assertEquals(2, f.getNumerator()); + assertEquals(1, f.getDenominator()); + + f = Fraction.of(23, 345); + assertEquals(1, f.getNumerator()); + assertEquals(15, f.getDenominator()); + + // improper + f = Fraction.of(22, 7); + assertEquals(22, f.getNumerator()); + assertEquals(7, f.getDenominator()); + + // negatives + f = Fraction.of(-6, 10); + assertEquals(-3, f.getNumerator()); + assertEquals(5, f.getDenominator()); + + f = Fraction.of(6, -10); + assertEquals(3, f.getNumerator()); + assertEquals(-5, f.getDenominator()); + + f = Fraction.of(-6, -10); + assertEquals(-3, f.getNumerator()); + assertEquals(-5, f.getDenominator()); + + // zero denominator + assertThrows(ArithmeticException.class, () -> Fraction.of(1, 0)); + assertThrows(ArithmeticException.class, () -> Fraction.of(2, 0)); + assertThrows(ArithmeticException.class, () -> Fraction.of(-3, 0)); + + /* + * This is allowed in [numbers]. Removing the test makes the most sense. + * // very large: can't represent as unsimplified fraction, although + * Fraction.of(4, Integer.MIN_VALUE); + * Fraction.of(1, Integer.MIN_VALUE); + */ + } + +/* + * Removed as not supported in numbers. + * + * @Test + * public void testFactory_int_int_int() { + * Fraction f = null; + * + * // zero + * f = Fraction.of(0, 0, 2); + * assertEquals(0, f.getNumerator()); + * assertEquals(1, f.getDenominator()); + * + * f = Fraction.of(2, 0, 2); + * assertEquals(2, f.getNumerator()); + * assertEquals(1, f.getDenominator()); + * + * f = Fraction.of(0, 1, 2); + * assertEquals(1, f.getNumerator()); + * assertEquals(2, f.getDenominator()); + * + * // normal + * f = Fraction.of(1, 1, 2); + * assertEquals(3, f.getNumerator()); + * assertEquals(2, f.getDenominator()); + * + * // negatives + * assertThrows(ArithmeticException.class, () -> Fraction.of(1, -6, -10)); + * assertThrows(ArithmeticException.class, () -> Fraction.of(1, -6, -10)); + * assertThrows(ArithmeticException.class, () -> Fraction.of(1, -6, -10)); + * + * // negative whole + * f = Fraction.of(-1, 6, 10); + * assertEquals(-8, f.getNumerator()); + * assertEquals(5, f.getDenominator()); + * + * assertThrows(ArithmeticException.class, () -> Fraction.of(-1, -6, 10)); + * assertThrows(ArithmeticException.class, () -> Fraction.of(-1, 6, -10)); + * assertThrows(ArithmeticException.class, () -> Fraction.of(-1, -6, -10)); + * + * // zero denominator + * assertThrows(ArithmeticException.class, () -> Fraction.of(0, 1, 0)); + * assertThrows(ArithmeticException.class, () -> Fraction.of(1, 2, 0)); + * assertThrows(ArithmeticException.class, () -> Fraction.of(-1, -3, 0)); + * assertThrows(ArithmeticException.class, () -> Fraction.of(Integer.MAX_VALUE, 1, 2)); + * assertThrows(ArithmeticException.class, () -> Fraction.of(-Integer.MAX_VALUE, 1, 2)); + * + * // very large + * f = Fraction.of(-1, 0, Integer.MAX_VALUE); + * assertEquals(-1, f.getNumerator()); + * assertEquals(1, f.getDenominator()); + * + * // negative denominators not allowed in this constructor. + * assertThrows(ArithmeticException.class, () -> Fraction.of(0, 4, Integer.MIN_VALUE)); + * assertThrows(ArithmeticException.class, () -> Fraction.of(1, 1, Integer.MAX_VALUE)); + * assertThrows(ArithmeticException.class, () -> Fraction.of(-1, 2, Integer.MAX_VALUE)); + * } + */ + + @Test + public void testReducedFactory_int_int() { + Fraction f = null; + + // zero + f = Fraction.of(0, 1); + assertEquals(0, f.getNumerator()); + assertEquals(1, f.getDenominator()); + + // normal + f = Fraction.of(1, 1); + assertEquals(1, f.getNumerator()); + assertEquals(1, f.getDenominator()); + + f = Fraction.of(2, 1); + assertEquals(2, f.getNumerator()); + assertEquals(1, f.getDenominator()); + + // improper + f = Fraction.of(22, 7); + assertEquals(22, f.getNumerator()); + assertEquals(7, f.getDenominator()); + + // negatives + f = Fraction.of(-6, 10); + assertEquals(-3, f.getNumerator()); + assertEquals(5, f.getDenominator()); + + f = Fraction.of(6, -10); + assertEquals(3, f.getNumerator()); + assertEquals(-5, f.getDenominator()); + + f = Fraction.of(-6, -10); + assertEquals(-3, f.getNumerator()); + assertEquals(-5, f.getDenominator()); + + // zero denominator + assertThrows(ArithmeticException.class, () -> Fraction.of(1, 0)); + assertThrows(ArithmeticException.class, () -> Fraction.of(2, 0)); + assertThrows(ArithmeticException.class, () -> Fraction.of(-3, 0)); + + // reduced + f = Fraction.of(0, 2); + assertEquals(0, f.getNumerator()); + assertEquals(1, f.getDenominator()); + + f = Fraction.of(2, 2); + assertEquals(1, f.getNumerator()); + assertEquals(1, f.getDenominator()); + + f = Fraction.of(2, 4); + assertEquals(1, f.getNumerator()); + assertEquals(2, f.getDenominator()); + + f = Fraction.of(15, 10); + assertEquals(3, f.getNumerator()); + assertEquals(2, f.getDenominator()); + + f = Fraction.of(121, 22); + assertEquals(11, f.getNumerator()); + assertEquals(2, f.getDenominator()); + + // Extreme values + // OK, can reduce before negating + f = Fraction.of(-2, Integer.MIN_VALUE); + assertEquals(-1, f.getNumerator()); + assertEquals(Integer.MIN_VALUE / 2, f.getDenominator()); + + /* + * This is allowed in [numbers] Review comment: @aherbert done. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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