1 /* 2 * Copyright (C) 2016 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.documentsui.testing; 18 19 import static org.junit.Assert.assertEquals; 20 import static org.junit.Assert.assertFalse; 21 import static org.junit.Assert.assertTrue; 22 23 import java.util.concurrent.CompletableFuture; 24 import java.util.concurrent.ExecutionException; 25 import java.util.concurrent.TimeUnit; 26 import java.util.concurrent.TimeoutException; 27 import java.util.function.Predicate; 28 29 import javax.annotation.Nullable; 30 31 /** 32 * Test {@link Predicate} that can be used to spy on, control responses from, 33 * and make assertions against values tested. 34 */ 35 public class TestPredicate<T> implements Predicate<T> { 36 37 private final CompletableFuture<T> mFuture = new CompletableFuture<>(); 38 private @Nullable T mLastValue; 39 private boolean mNextReturnValue; 40 private boolean mCalled; 41 42 @Override test(T t)43 public boolean test(T t) { 44 mCalled = true; 45 mLastValue = t; 46 mFuture.complete(t); 47 return mNextReturnValue; 48 } 49 assertLastArgument(@ullable T expected)50 public void assertLastArgument(@Nullable T expected) { 51 assertEquals(expected, mLastValue); 52 } 53 assertCalled()54 public void assertCalled() { 55 assertTrue(mCalled); 56 } 57 assertNotCalled()58 public void assertNotCalled() { 59 assertFalse(mCalled); 60 } 61 nextReturn(boolean value)62 public void nextReturn(boolean value) { 63 mNextReturnValue = value; 64 } 65 waitForCall(int timeout, TimeUnit unit)66 public @Nullable T waitForCall(int timeout, TimeUnit unit) 67 throws InterruptedException, ExecutionException, TimeoutException { 68 return mFuture.get(timeout, unit); 69 } 70 getLastValue()71 public @Nullable T getLastValue() { 72 return mLastValue; 73 } 74 } 75