java.lang.IllegalStateException: Could not initial

问题:

Trying to run instrumentation test on AS.

stuck with this Error:

java.lang.IllegalStateException: Could not initialize plugin: interface org.mockito.plugins.MockMaker at org.mockito.internal.configuration.plugins.PluginLoader$1.invoke(PluginLoader.java:66) at java.lang.reflect.Proxy.invoke(Proxy.java:393) at $Proxy4.isTypeMockable(Unknown Source)

ExampleInstrumentedTest.java

      @RunWith(AndroidJUnit4.class)
        public class ExampleInstrumentedTest {

            @Mock
            Context context;

  @Before
    public void init(){
        MockitoAnnotations.initMocks(this);
    }

        @Test
            public void testDisabledFlag()  {
                ChanceValidator chanceValidator  = new ChanceValidator(context);
                Validator.ValidationResult result = chanceValidator.validate(2);
                assertEquals(result, Validator.ValidationResult.NO_ERROR);
        }
       }

build.gradle

apply plugin: 'com.android.application'

     android{
        ..
        defaultConfig {
                testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        }

         testOptions {
                unitTests.returnDefaultValues = true
            }
    }


    dependencies {
        compile fileTree(include: ['*.jar'], dir: 'libs')
        // Unit testing dependencies
        testCompile 'junit:junit:4.12'
        // Set this dependency if you want to use the Hamcrest matcher library
        testCompile 'org.hamcrest:hamcrest-library:1.3'
        // more stuff, e.g., Mockito
        androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
            exclude group: 'com.android.support', module: 'support-annotations'
        })
        compile 'com.android.support:appcompat-v7:25.1.0'
        compile project(':mortar')
        compile project(':mockito-core-2.6.6')
    }

Update: After commenting line-

MockitoAnnotations.initMocks(this);

It is building fine(No Exception) but context mocked is now null.

回答1:

Worked:

dependencies { 
def mockito_version = '2.7.1' // For local unit tests on your development machine
 testCompile "org.mockito:mockito-core:$mockito_version" // For instrumentation tests on Android devices and emulators
 androidTestCompile "org.mockito:mockito-android:$mockito_version"
 }

No need to comment initiMocks

回答2:

Do not explicitly include mockito, let powermock pull in what it needs.

回答3:

In my case, I was working on a project that does not use the maven build system. So this is what worked for me.

Navigated to the maven repo for mockito (used v2.26): https://mvnrepository.com/artifact/org.mockito/mockito-core/2.26.0. I downloaded the jar. On the same page at the bottom, I looked up the dependencies. For mockito 2.26.0, these dependencies are:

• Byte Buddy v.1.9.10 (https://mvnrepository.com/artifact/net.bytebuddy/byte-buddy/1.9.10)
• Byte Buddy Java Agent v1.9.10 (https://mvnrepository.com/artifact/net.bytebuddy/byte-buddy-agent/1.9.10)
• Objenesis v2.6 (https://mvnrepository.com/artifact/org.objenesis/objenesis/2.6) I downloaded the jar files for the above mockito dependencies.

In Eclipse I created a user library containing the four jar file and added it to my project.

NB: (creating the library is optional, you can add the jars directly to your project build path)

Hope this helps someone.