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 omitte

Answer 1

If you added kaptAndroidTest for dagger dependencies and still not getting test components when rebuild your project, try running assembleAndroidTest.

Answer 2

Hi even after adding all gradle dependenices and annotations if it still doesnt work then you need to run assembleAndroidTest gradle script for this. Simply make an empty test case and run it. It will do the job for you. Cheers

Answer 3

If you are using kotlin use "kaptAndroidTest" to generate dagger component for android tests in your build.gradle file.

Answer 4

Just to add a bit to the above answer, since there have been some recent changes.

From Android Gradle plugin version 2.2 and above you will no longer use testApt.

So from now on you need to put only this in the build.gradle:

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

But more than that, what I came here for, is the following: if you need gradle to generate the DaggerComponent classes for you you will have to do a bit extra work.

Open our build.gradle file and AFTER the android section write this:

android.applicationVariants.all { variant ->
    if (variant.buildType.name == "debug") {
        def aptOutputDir = new File(buildDir, "generated/source/apt/${variant.unitTestVariant.dirName}")
        variant.unitTestVariant.addJavaSourceFoldersToModel(aptOutputDir)
        assembleDebug.finalizedBy('assembleDebugUnitTest')
    }
}

This will create the directory build/generated/source/apt/test/ as a Java classes recipient and the last part will trigger the "assembleDebugUnitTest" task that will finally create those Dagger2 components in the folder that was just created.

Note that this script is just being triggered for the "debug" variant and takes advantage of that build variant using the "assembleDebug" task. If for some reason you need it in other variants just tweak that a bit.

Why Dagger2 does not do this automatically is beyond me, but hey, I am no pro.

Answer 5

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.

Answer 6

Adding to the above solution and adding the testKapt and androidTestKapt for dagger, I had the problem that my modules and components had the wrong imports as a result of missing imports

e.g

 import android.support.test.espresso.core.deps.dagger.Module
 import android.support.test.espresso.core.deps.dagger.Module

instead of

import dagger.Module
import dagger.Provides

Hope this helps