/* * The MIT License (MIT) * * Copyright (c) 2017-2020 Yegor Bugayenko * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ package org.cactoos.func; import java.security.SecureRandom; import org.cactoos.Func; import org.hamcrest.MatcherAssert; import org.hamcrest.Matchers; import org.junit.Test; /** * Test case for {@link StickyFunc}. * * @since 0.4 * @checkstyle JavadocMethodCheck (500 lines) */ public final class StickyFuncTest { @Test public void cachesFuncResults() throws Exception { final Func<Boolean, Integer> func = new StickyFunc<>( input -> new SecureRandom().nextInt() ); MatcherAssert.assertThat( func.apply(true) + func.apply(true), Matchers.equalTo(func.apply(true) + func.apply(true)) ); } @Test public void cachesWithLimitedBuffer() throws Exception { final Func<Integer, Integer> func = new StickyFunc<>( input -> new SecureRandom().nextInt(), 2 ); final int first = func.apply(0); final int second = func.apply(1); MatcherAssert.assertThat( first + second, Matchers.equalTo(func.apply(0) + func.apply(1)) ); final int third = func.apply(-1); MatcherAssert.assertThat( second + third, Matchers.equalTo(func.apply(1) + func.apply(-1)) ); } @Test public void cachesWithZeroBuffer() throws Exception { final Func<Boolean, Integer> func = new StickyFunc<>( input -> new SecureRandom().nextInt(), 0 ); MatcherAssert.assertThat( func.apply(true) + func.apply(true), Matchers.not(Matchers.equalTo(func.apply(true) + func.apply(true))) ); } }