java/dagger/hilt/android/example/gradle/simple/app/src/test/java/dagger/hilt/android/example/gradle/simple/SimpleActivityTest.java

/*
 * Copyright (C) 2020 The Dagger Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package dagger.hilt.android.example.gradle.simple;

import static com.google.common.truth.Truth.assertThat;

import android.os.Build;
import androidx.test.core.app.ActivityScenario;
import androidx.test.ext.junit.runners.AndroidJUnit4;
import dagger.hilt.android.testing.BindValue;
import dagger.hilt.android.testing.HiltAndroidRule;
import dagger.hilt.android.testing.HiltAndroidTest;
import dagger.hilt.android.testing.HiltTestApplication;
import dagger.hilt.android.testing.UninstallModules;
import javax.inject.Inject;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.annotation.Config;

/** A simple test using Hilt. */
@UninstallModules(UserNameModule.class)
@HiltAndroidTest
@RunWith(AndroidJUnit4.class)
// Robolectric requires Java9 to run API 29 and above, so use API 28 instead
@Config(sdk = Build.VERSION_CODES.P, application = HiltTestApplication.class)
public final class SimpleActivityTest {
  @Rule public HiltAndroidRule rule = new HiltAndroidRule(this);

  @BindValue @UserName String fakeUserName = "FakeUser";

  @Inject @UserName String injectedUserName;

  @Test
  public void testInjectedUserName() throws Exception {
    assertThat(injectedUserName).isNull();
    rule.inject();
    assertThat(injectedUserName).isEqualTo("FakeUser");
  }

  @Test
  public void testActivityInject() throws Exception {
    try (ActivityScenario<SimpleActivity> scenario =
        ActivityScenario.launch(SimpleActivity.class)) {
      scenario.onActivity(
          activity -> assertThat(activity.greeter.greet()).isEqualTo("Hello, FakeUser!"));
    }
  }
}