FlutterEngineCacheTest.java

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package io.flutter.embedding.engine;
 
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.mock;
 
import androidx.test.ext.junit.runners.AndroidJUnit4;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.annotation.Config;
 
@Config(manifest = Config.NONE)
@RunWith(AndroidJUnit4.class)
public class FlutterEngineCacheTest {
  @Test
  public void itHoldsFlutterEngines() {
    // --- Test Setup ---
    FlutterEngine flutterEngine = mock(FlutterEngine.class);
    FlutterEngineCache cache = new FlutterEngineCache();
 
    // --- Execute Test ---
    cache.put("my_flutter_engine", flutterEngine);
 
    // --- Verify Results ---
    assertEquals(flutterEngine, cache.get("my_flutter_engine"));
  }
 
  @Test
  public void itQueriesFlutterEngineExistence() {
    // --- Test Setup ---
    FlutterEngine flutterEngine = mock(FlutterEngine.class);
    FlutterEngineCache cache = new FlutterEngineCache();
 
    // --- Execute Test ---
    assertFalse(cache.contains("my_flutter_engine"));
 
    cache.put("my_flutter_engine", flutterEngine);
 
    // --- Verify Results ---
    assertTrue(cache.contains("my_flutter_engine"));
  }
 
  @Test
  public void itRemovesFlutterEngines() {
    // --- Test Setup ---
    FlutterEngine flutterEngine = mock(FlutterEngine.class);
    FlutterEngineCache cache = new FlutterEngineCache();
 
    // --- Execute Test ---
    cache.put("my_flutter_engine", flutterEngine);
    cache.remove("my_flutter_engine");
 
    // --- Verify Results ---
    assertNull(cache.get("my_flutter_engine"));
  }
 
  @Test
  public void itRemovesAllFlutterEngines() {
    // --- Test Setup ---
    FlutterEngine flutterEngine = mock(FlutterEngine.class);
    FlutterEngine flutterEngine2 = mock(FlutterEngine.class);
    FlutterEngineCache cache = new FlutterEngineCache();
 
    // --- Execute Test ---
    cache.put("my_flutter_engine", flutterEngine);
    cache.put("my_flutter_engine_2", flutterEngine2);
 
    // --- Verify Results ---
    assertEquals(flutterEngine, cache.get("my_flutter_engine"));
    assertEquals(flutterEngine2, cache.get("my_flutter_engine_2"));
 
    cache.clear();
 
    // --- Verify Results ---
    assertNull(cache.get("my_flutter_engine"));
    assertNull(cache.get("my_flutter_engine_2"));
  }
}