1 /* 2 * Copyright (C) 2020 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.csuite.testing; 18 19 import com.google.common.truth.Correspondence; 20 21 /** 22 * Useful implementations of {@link Correspondence}. 23 * 24 * <p>Correspondences are used with {@code IterableSubject.comparingElementsUsing(Correspondence)} 25 * and allow for making assertions on elements besides simple equality. See {@link Correspondence} 26 * for more information. 27 */ 28 // TODO(hzalek): Move this into a dedicated testing library. 29 public final class Correspondences { 30 31 private static final Correspondence<Object, Class<?>> INSTANCE_OF = 32 Correspondence.from( 33 (Object obj, Class<?> clazz) -> { 34 return clazz.isInstance(obj); 35 }, 36 "is an instance of"); 37 38 /** 39 * Returns a {@link Correspondence} that determines whether elements are instances of the class 40 * they are compared to. 41 */ instanceOf()42 public static Correspondence<Object, Class<?>> instanceOf() { 43 return INSTANCE_OF; 44 } 45 Correspondences()46 private Correspondences() {} 47 } 48