1 /* 2 * Copyright 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 androidx.collection; 18 19 import static org.junit.Assert.assertFalse; 20 import static org.junit.Assert.assertTrue; 21 22 import org.junit.Test; 23 24 public class SparseArrayCompatTest { 25 @Test 26 public void isEmpty() throws Exception { 27 SparseArrayCompat<String> sparseArrayCompat = new SparseArrayCompat<>(); 28 assertTrue(sparseArrayCompat.isEmpty()); // Newly created SparseArrayCompat should be empty 29 30 // Adding elements should change state from empty to not empty. 31 for (int i = 0; i < 5; i++) { 32 sparseArrayCompat.put(i, Integer.toString(i)); 33 assertFalse(sparseArrayCompat.isEmpty()); 34 } 35 sparseArrayCompat.clear(); 36 assertTrue(sparseArrayCompat.isEmpty()); // A cleared SparseArrayCompat should be empty. 37 38 39 int key1 = 1, key2 = 2; 40 String value1 = "some value", value2 = "some other value"; 41 sparseArrayCompat.append(key1, value1); 42 assertFalse(sparseArrayCompat.isEmpty()); // has 1 element. 43 sparseArrayCompat.append(key2, value2); 44 assertFalse(sparseArrayCompat.isEmpty()); // has 2 elements. 45 assertFalse(sparseArrayCompat.isEmpty()); // consecutive calls should be OK. 46 47 sparseArrayCompat.remove(key1); 48 assertFalse(sparseArrayCompat.isEmpty()); // has 1 element. 49 sparseArrayCompat.remove(key2); 50 assertTrue(sparseArrayCompat.isEmpty()); 51 } 52 } 53