使用Firebase在AndroidStudio中进行JUnit测试

您可以使用Mockito和PowerMockito来模拟Firebase依赖项.对于模拟静态函数(例如FirebaseDatabase.getInstance()),必须使用PowerMockRunner来运行测试,但稍后可以委托给不同的运行程序.

package com.test.firebasetest;

import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mockito;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

import static org.mockito.Matchers.any;
import static org.mockito.Matchers.anyString;
import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.when;

@RunWith(PowerMockRunner.class)
@PowerMockRunnerDelegate(JUnit4.class)
@PrepareForTest({ FirebaseDatabase.class})
public class LoginActivityTest {

  private DatabaseReference mockedDatabaseReference;

  @Before
  public void before() {
    mockedDatabaseReference = Mockito.mock(DatabaseReference.class);

    FirebaseDatabase mockedFirebaseDatabase = Mockito.mock(FirebaseDatabase.class);
    when(mockedFirebaseDatabase.getReference()).thenReturn(mockedDatabaseReference);

    PowerMockito.mockStatic(FirebaseDatabase.class);
    when(FirebaseDatabase.getInstance()).thenReturn(mockedFirebaseDatabase);
  }

  @Test
  public void getSignedInUserProfileTest() {
    when(mockedDatabaseReference.child(anyString())).thenReturn(mockedDatabaseReference);

    doAnswer(new Answer() {
      @Override
      public Void answer(InvocationOnMock invocation) throws Throwable {
        ValueEventListener valueEventListener = (ValueEventListener) invocation.getArguments()[0];

        DataSnapshot mockedDataSnapshot = Mockito.mock(DataSnapshot.class);
        //when(mockedDataSnapshot.getValue(User.class)).thenReturn(testOrMockedUser)

        valueEventListener.onDataChange(mockedDataSnapshot);
        //valueEventListener.onCancelled(...);

        return null;
      }
    }).when(mockedDatabaseReference).addListenerForSingleValueEvent(any(ValueEventListener.class));

    new LoginActivity().getSignedInUserProfile();

    // check preferences are updated
  }

}

您需要为模块添加适当的依赖项build.gradle:

testCompile 'junit:junit:4.12'
testCompile 'org.powermock:powermock:1.6.5'
testCompile 'org.powermock:powermock-module-junit4:1.6.5'
testCompile 'org.powermock:powermock-api-mockito:1.6.5'