1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.internal.textservice; 18 19 import static org.junit.Assert.assertEquals; 20 import static org.mockito.ArgumentMatchers.anyInt; 21 import static org.mockito.ArgumentMatchers.eq; 22 import static org.mockito.Mockito.mock; 23 import static org.mockito.Mockito.never; 24 import static org.mockito.Mockito.times; 25 import static org.mockito.Mockito.verify; 26 import static org.mockito.Mockito.when; 27 28 import android.support.test.filters.SmallTest; 29 import android.support.test.runner.AndroidJUnit4; 30 31 import org.junit.Test; 32 import org.junit.runner.RunWith; 33 34 import java.util.concurrent.atomic.AtomicReference; 35 import java.util.function.IntUnaryOperator; 36 37 @SmallTest 38 @RunWith(AndroidJUnit4.class) 39 public class LazyIntToIntMapTest { 40 @Test 41 public void testLaziness() { 42 final IntUnaryOperator func = mock(IntUnaryOperator.class); 43 when(func.applyAsInt(eq(1))).thenReturn(11); 44 when(func.applyAsInt(eq(2))).thenReturn(22); 45 46 final LazyIntToIntMap map = new LazyIntToIntMap(func); 47 48 verify(func, never()).applyAsInt(anyInt()); 49 50 assertEquals(22, map.get(2)); 51 verify(func, times(0)).applyAsInt(eq(1)); 52 verify(func, times(1)).applyAsInt(eq(2)); 53 54 // Accessing to the same key does not evaluate the function again. 55 assertEquals(22, map.get(2)); 56 verify(func, times(0)).applyAsInt(eq(1)); 57 verify(func, times(1)).applyAsInt(eq(2)); 58 } 59 60 @Test 61 public void testDelete() { 62 final IntUnaryOperator func1 = mock(IntUnaryOperator.class); 63 when(func1.applyAsInt(eq(1))).thenReturn(11); 64 when(func1.applyAsInt(eq(2))).thenReturn(22); 65 66 final IntUnaryOperator func2 = mock(IntUnaryOperator.class); 67 when(func2.applyAsInt(eq(1))).thenReturn(111); 68 when(func2.applyAsInt(eq(2))).thenReturn(222); 69 70 final AtomicReference<IntUnaryOperator> funcRef = new AtomicReference<>(func1); 71 final LazyIntToIntMap map = new LazyIntToIntMap(i -> funcRef.get().applyAsInt(i)); 72 73 verify(func1, never()).applyAsInt(anyInt()); 74 verify(func2, never()).applyAsInt(anyInt()); 75 76 assertEquals(22, map.get(2)); 77 verify(func1, times(1)).applyAsInt(eq(2)); 78 verify(func2, times(0)).applyAsInt(eq(2)); 79 80 // Swap func1 with func2 then invalidate the key=2 81 funcRef.set(func2); 82 map.delete(2); 83 84 // Calling get(2) again should re-evaluate the value. 85 assertEquals(222, map.get(2)); 86 verify(func1, times(1)).applyAsInt(eq(2)); 87 verify(func2, times(1)).applyAsInt(eq(2)); 88 89 // Trying to delete non-existing keys does nothing. 90 map.delete(1); 91 } 92 } 93
