android - Dagger not generating components for /test class

Question

I am following the guide here: https://github.com/ecgreb/dagger-2-testing-demo

I have the following setup in my app/src/main (the injection and @Provides code omitted):

public class FlingyApplication extends Application {
    @Singleton
    @Component(modules = { FlingyModule.class })
    public interface FlingyComponent
}

@Module
public class FlingyModule

In app/src/test:

public class TestFlingyApplication extends Application {
    @Singleton
    @Component(modules = { TestFlingyModule.class })
    public interface TestFlingyComponent extends FlingyComponent
}

@Module
public class TestFlingyModule

So far, it is nearly identical to the example github. When dagger goes to generate the code for the Component builders in src/main, they generate properly. Dagger does not, however, generate code for the Component builders in src/test.

My main build.gradle:

dependencies {
    classpath 'com.android.tools.build:gradle:2.1.0-alpha3'

    classpath 'com.neenbedankt.gradle.plugins:android-apt:1.5.1'
}

My app/build.gradle

apply plugin: 'com.android.application'
apply plugin: 'com.neenbedankt.android-apt'


android {
    # There is obviously more in here, but this is the custom part:
    packagingOptions {
        exclude 'META-INF/services/javax.annotation.processing.Processor'
    }
}

dependencies {
    compile 'com.squareup:otto:1.3.8'
    compile 'com.android.support:cardview-v7:23.1.1'
    compile 'com.android.support:recyclerview-v7:23.1.1'
    compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'com.android.support:design:23.1.1'
    compile 'com.squareup.picasso:picasso:2.5.2'
    compile 'com.jakewharton:butterknife:7.0.1'

    compile 'com.google.dagger:dagger:2.0.1'
    apt 'com.google.dagger:dagger-compiler:2.0.1'
    compile 'javax.annotation:javax.annotation-api:1.2'

    compile 'io.reactivex:rxandroid:1.1.0'
    compile 'io.reactivex:rxjava:1.1.0'

    testCompile 'com.neenbedankt.gradle.plugins:android-apt:1.4'
    testCompile 'junit:junit:4.12'
    testCompile 'org.robolectric:robolectric:3.0'
    testCompile 'org.mockito:mockito-core:1.10.19'
}

So when I build, I get the DaggerFlingyApplication_FlingyComponent class, but not the DaggerTestFlingyApplication_TestFlingyComponent

Something interesting I noticed is that if I switch the line:

apt 'com.google.dagger:dagger-compiler:2.0.1'
# TO
compile 'com.google.dagger:dagger-compiler:2.0.1'

I see the following when I run ./gradlew compileDebugUnitTestSources:

:app:compileDebugJavaWithJavac
Note: /app/build/generated/source/apt/debug/com/jy/flingy/DaggerFlingyApplication_FlingyComponent.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
:app:preDebugUnitTestBuild UP-TO-DATE
:app:prepareDebugUnitTestDependencies
:app:compileDebugUnitTestJavaWithJavac
Note: /app/build/intermediates/classes/test/debug/com/jy/flingy/DaggerTestFlingyApplication_TestFlingyComponent.java uses unchecked or unsafe operations.

I don't know why it builds to intermediates and I assume that I need the build.gradle file to use apt instead of compile, but I can't seem to figure out how to get this to work. I know that it's absolutely possible.

Answer 1

You need to add following to your build.gradle file for instrumentation test:

androidTestApt 'com.google.dagger:dagger-compiler:<version>'

or for JUnit test:

testApt 'com.google.dagger:dagger-compiler:<version>'

This is required to generate Dagger code for your test components.

---

EDIT:

If you are using jack tool chain then add following for android test:

androidTestAnnotationProcessor 'com.google.dagger:dagger-compiler:<version>'

for JUnit tests:

testAnnotationProcessor 'com.google.dagger:dagger-compiler:<version>'

---

EDIT:

In case you are using kotlin-kapt for Kotlin code use following:

kaptAndroidTest 'com.google.dagger:dagger-compiler:<version>'

or for JUnit test:

kaptTest 'com.google.dagger:dagger-compiler:<version>'

Check this link for more info.