FlutterInjectorTest.java

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
package io.flutter;
 
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertThrows;
import static org.junit.Assert.assertTrue;
 
import androidx.test.ext.junit.runners.AndroidJUnit4;
import io.flutter.embedding.engine.deferredcomponents.PlayStoreDeferredComponentManager;
import io.flutter.embedding.engine.loader.FlutterLoader;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
import org.robolectric.annotation.Config;
 
@Config(manifest = Config.NONE)
@RunWith(AndroidJUnit4.class)
public class FlutterInjectorTest {
  @Mock FlutterLoader mockFlutterLoader;
  @Mock PlayStoreDeferredComponentManager mockDeferredComponentManager;
  @Mock ExecutorService mockExecutorService;
 
  @Before
  public void setUp() {
    // Since the intent is to have a convenient static class to use for production.
    FlutterInjector.reset();
    MockitoAnnotations.openMocks(this);
  }
 
  @After
  public void tearDown() {
    FlutterInjector.reset();
  }
 
  @Test
  public void itHasSomeReasonableDefaults() {
    // Implicitly builds when first accessed.
    FlutterInjector injector = FlutterInjector.instance();
    assertNotNull(injector.flutterLoader());
    assertNull(injector.deferredComponentManager());
    assertNotNull(injector.executorService());
  }
 
  @Test
  public void executorCreatesAndNamesNewThreadsByDefault()
      throws InterruptedException, ExecutionException {
    // Implicitly builds when first accessed.
    FlutterInjector injector = FlutterInjector.instance();
 
    List<Callable<String>> callables =
        Arrays.asList(
            () -> {
              return Thread.currentThread().getName();
            },
            () -> {
              return Thread.currentThread().getName();
            });
 
    List<Future<String>> threadNames;
    threadNames = injector.executorService().invokeAll(callables);
 
    assertEquals(threadNames.size(), 2);
    for (Future<String> name : threadNames) {
      assertTrue(name.get().startsWith("flutter-worker-"));
    }
  }
 
  @Test
  public void canPartiallyOverride() {
    FlutterInjector.setInstance(
        new FlutterInjector.Builder().setFlutterLoader(mockFlutterLoader).build());
    FlutterInjector injector = FlutterInjector.instance();
    assertEquals(injector.flutterLoader(), mockFlutterLoader);
  }
 
  @Test
  public void canInjectDeferredComponentManager() {
    FlutterInjector.setInstance(
        new FlutterInjector.Builder()
            .setDeferredComponentManager(mockDeferredComponentManager)
            .build());
    FlutterInjector injector = FlutterInjector.instance();
    assertEquals(injector.deferredComponentManager(), mockDeferredComponentManager);
  }
 
  @Test
  public void canInjectExecutorService() {
    FlutterInjector.setInstance(
        new FlutterInjector.Builder().setExecutorService(mockExecutorService).build());
    FlutterInjector injector = FlutterInjector.instance();
    assertEquals(injector.executorService(), mockExecutorService);
  }
 
  @Test()
  public void cannotBeChangedOnceRead() {
    FlutterInjector.instance();
 
    assertThrows(
        IllegalStateException.class,
        () -> {
          FlutterInjector.setInstance(
              new FlutterInjector.Builder().setFlutterLoader(mockFlutterLoader).build());
        });
  }
}