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      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