| /* |
| * 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.samza.util; |
| |
| import com.google.common.collect.ImmutableList; |
| |
| import java.util.Collections; |
| import org.junit.Test; |
| |
| import static org.junit.Assert.assertEquals; |
| |
| public class TestMathUtils { |
| |
| @Test(expected = IllegalArgumentException.class) |
| public void testGcdWithNullInputs() { |
| MathUtil.gcd(null); |
| } |
| |
| @Test(expected = IllegalArgumentException.class) |
| public void testGcdWithEmptyInputs() { |
| MathUtil.gcd(Collections.emptyList()); |
| } |
| |
| @Test |
| public void testGcdWithValidInputs() { |
| // gcd(x, x) = x |
| assertEquals(2, MathUtil.gcd(ImmutableList.of(2L, 2L))); |
| assertEquals(15, MathUtil.gcd(ImmutableList.of(15L))); |
| assertEquals(1, MathUtil.gcd(ImmutableList.of(1L))); |
| |
| // gcd(0,x) = x |
| assertEquals(2, MathUtil.gcd(ImmutableList.of(2L, 0L))); |
| |
| // gcd(1,x) = 1 |
| assertEquals(1, MathUtil.gcd(ImmutableList.of(10L, 20L, 30L, 40L, 50L, 1L))); |
| |
| // other happy path test cases |
| assertEquals(10, MathUtil.gcd(ImmutableList.of(10L, 20L, 30L, 40L, 50L, 0L))); |
| assertEquals(10, MathUtil.gcd(ImmutableList.of(10L, 20L, 30L, 40L, 50L))); |
| assertEquals(5, MathUtil.gcd(ImmutableList.of(25L, 35L, 45L, 55L))); |
| |
| assertEquals(1, MathUtil.gcd(ImmutableList.of(25L, 35L, 45L, 55L, 13L))); |
| } |
| |
| @Test |
| public void testClampAdd() { |
| assertEquals(0, MathUtil.clampAdd(0, 0)); |
| assertEquals(2, MathUtil.clampAdd(1, 1)); |
| assertEquals(-2, MathUtil.clampAdd(-1, -1)); |
| assertEquals(Long.MAX_VALUE, MathUtil.clampAdd(Long.MAX_VALUE, 0)); |
| assertEquals(Long.MAX_VALUE - 1, MathUtil.clampAdd(Long.MAX_VALUE, -1)); |
| assertEquals(Long.MAX_VALUE, MathUtil.clampAdd(Long.MAX_VALUE, 1)); |
| assertEquals(Long.MAX_VALUE, MathUtil.clampAdd(Long.MAX_VALUE, Long.MAX_VALUE)); |
| assertEquals(Long.MIN_VALUE, MathUtil.clampAdd(Long.MIN_VALUE, 0)); |
| assertEquals(Long.MIN_VALUE, MathUtil.clampAdd(Long.MIN_VALUE, -1)); |
| assertEquals(Long.MIN_VALUE + 1, MathUtil.clampAdd(Long.MIN_VALUE, 1)); |
| assertEquals(Long.MIN_VALUE, MathUtil.clampAdd(Long.MIN_VALUE, Long.MIN_VALUE)); |
| assertEquals(-1, MathUtil.clampAdd(Long.MAX_VALUE, Long.MIN_VALUE)); |
| } |
| } |