memoization-guava/src/test/java/de/xn__ho_hia/memoization/guava/GuavaCacheBasedDoubleToIntFunctionMemoizerTest.java

   1 /*
   2  * This file is part of memoization.java. It is subject to the license terms in the LICENSE file found in the top-level
   3  * directory of this distribution and at http://creativecommons.org/publicdomain/zero/1.0/. No part of memoization.java,
   4  * including this file, may be copied, modified, propagated, or distributed except according to the terms contained
   5  * in the LICENSE file.
   6  */
   7 package de.xn__ho_hia.memoization.guava;
   8
   9 import static org.mockito.BDDMockito.given;
  10 import static org.mockito.Matchers.any;
  11
  12 import java.util.concurrent.ExecutionException;
  13 import java.util.function.DoubleFunction;
  14 import java.util.function.DoubleToIntFunction;
  15
  16 import com.google.common.cache.Cache;
  17 import com.google.common.cache.CacheBuilder;
  18
  19 import org.junit.Assert;
  20 import org.junit.Rule;
  21 import org.junit.Test;
  22 import org.junit.rules.ExpectedException;
  23 import org.mockito.Mockito;
  24
  25 import de.xn__ho_hia.memoization.shared.MemoizationException;
  26 import de.xn__ho_hia.quality.suppression.CompilerWarnings;
  27
  28 /**
  29  *
  30  *
  31  */
  32 @SuppressWarnings({ CompilerWarnings.NLS, CompilerWarnings.STATIC_METHOD })
  33 public class GuavaCacheBasedDoubleToIntFunctionMemoizerTest {
  34
  35     /** Captures expected exceptions. */
  36     @Rule
  37     public ExpectedException thrown = ExpectedException.none();
  38
  39     /**
  40     *
  41     */
  42     @Test
  43     public void shouldAcceptLoadingCache() {
  44         // given
  45         final DoubleToIntFunction function = a -> 123;
  46         final DoubleFunction<Double> keyFunction = Double::valueOf;
  47         final Cache<Double, Integer> cache = CacheBuilder.newBuilder().build();
  48
  49         // when
  50         final GuavaCacheBasedDoubleToIntFunctionMemoizer<Double> memoizer = new GuavaCacheBasedDoubleToIntFunctionMemoizer<>(
  51                 cache, keyFunction, function);
  52
  53         // then
  54         Assert.assertNotNull(memoizer);
  55     }
  56
  57     /**
  58     *
  59     */
  60     @Test
  61     public void shouldTransformInput() {
  62         // given
  63         final DoubleToIntFunction function = a -> 123;
  64         final DoubleFunction<Double> keyFunction = Double::valueOf;
  65         final Cache<Double, Integer> cache = CacheBuilder.newBuilder().build();
  66
  67         // when
  68         final GuavaCacheBasedDoubleToIntFunctionMemoizer<Double> memoizer = new GuavaCacheBasedDoubleToIntFunctionMemoizer<>(
  69                 cache, keyFunction, function);
  70
  71         // then
  72         Assert.assertEquals("Memoized value does not match expectation", 123, memoizer.applyAsInt(789D));
  73     }
  74
  75     /**
  76      * @throws ExecutionException
  77      *             Added for the call to 'cache.get(..)'.
  78      */
  79     @Test
  80     @SuppressWarnings(CompilerWarnings.UNCHECKED)
  81     public void shouldWrapExecutionExceptionInMemoizationException() throws ExecutionException {
  82         // given
  83         final DoubleFunction<Double> keyFunction = Double::valueOf;
  84         final Cache<Double, Integer> cache = Mockito.mock(Cache.class);
  85         given(cache.get(any(), any())).willThrow(ExecutionException.class);
  86         final GuavaCacheBasedDoubleToIntFunctionMemoizer<Double> memoizer = new GuavaCacheBasedDoubleToIntFunctionMemoizer<>(
  87                 cache, keyFunction, null);
  88
  89         // when
  90         thrown.expect(MemoizationException.class);
  91
  92         // then
  93         memoizer.applyAsInt(789D);
  94     }
  95
  96 }