FlutterEngineGroupCacheTest.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 static org.mockito.Mockito.when;
 
import androidx.test.core.app.ApplicationProvider;
import io.flutter.FlutterInjector;
import io.flutter.embedding.engine.loader.FlutterLoader;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.RobolectricTestRunner;
import org.robolectric.annotation.Config;
 
@Config(manifest = Config.NONE)
@RunWith(RobolectricTestRunner.class)
public class FlutterEngineGroupCacheTest {
 
  private FlutterEngineGroup flutterEngineGroup;
 
  @Before
  public void setup() {
    // Create a mocked FlutterEngineGroup that provided to run this test case
    FlutterInjector.reset();
    FlutterLoader mockFlutterLoader = mock(FlutterLoader.class);
    when(mockFlutterLoader.findAppBundlePath()).thenReturn("default_flutter_assets/path");
    FlutterInjector.setInstance(
        new FlutterInjector.Builder().setFlutterLoader(mockFlutterLoader).build());
    flutterEngineGroup = mock(FlutterEngineGroup.class);
  }
 
  @Test
  public void itHoldsFlutterEngineGroups() {
    // --- Test Setup ---
    FlutterEngineGroupCache cache = new FlutterEngineGroupCache();
 
    // --- Execute Test ---
    cache.put("my_flutter_engine_group", flutterEngineGroup);
 
    // --- Verify Results ---
    assertEquals(flutterEngineGroup, cache.get("my_flutter_engine_group"));
  }
 
  @Test
  public void itQueriesFlutterEngineGroupExistence() {
    // --- Test Setup ---
    FlutterEngineGroupCache cache = new FlutterEngineGroupCache();
 
    // --- Execute Test ---
    assertFalse(cache.contains("my_flutter_engine_group"));
 
    cache.put("my_flutter_engine_group", flutterEngineGroup);
 
    // --- Verify Results ---
    assertTrue(cache.contains("my_flutter_engine_group"));
  }
 
  @Test
  public void itRemovesFlutterEngineGroups() {
    // --- Test Setup ---
    FlutterEngineGroupCache cache = new FlutterEngineGroupCache();
 
    // --- Execute Test ---
    cache.put("my_flutter_engine_group", flutterEngineGroup);
    cache.remove("my_flutter_engine_group");
 
    // --- Verify Results ---
    assertNull(cache.get("my_flutter_engine_group"));
  }
 
  @Test
  public void itRemovesAllFlutterEngineGroups() {
    // --- Test Setup ---
    FlutterEngineGroup flutterEngineGroup1 =
        new FlutterEngineGroup(ApplicationProvider.getApplicationContext());
    FlutterEngineGroup flutterEngineGroup2 =
        new FlutterEngineGroup(ApplicationProvider.getApplicationContext());
    FlutterEngineGroupCache cache = new FlutterEngineGroupCache();
 
    // --- Execute Test ---
    cache.put("my_flutter_engine_group", flutterEngineGroup1);
    cache.put("my_flutter_engine_group_2", flutterEngineGroup2);
 
    // --- Verify Results ---
    assertEquals(flutterEngineGroup1, cache.get("my_flutter_engine_group"));
    assertEquals(flutterEngineGroup2, cache.get("my_flutter_engine_group_2"));
 
    cache.clear();
 
    // --- Verify Results ---
    assertNull(cache.get("my_flutter_engine_group"));
    assertNull(cache.get("my_flutter_engine_group_2"));
  }
}