InstrumentalTests: Unresolved reference: create

• I have searched existing issues and this is not a duplicate

Version

ext {
    screenshotTestVersion = '0.6.0'
    kotlinVersion = '1.2.41'
    litho = '0.15.0'
}

Issues and Steps to Reproduce

I create test according to https://github.com/facebook/screenshot-tests-for-android/blob/master/sample/src/androidTest/java/com/facebook/testing/screenshot/sample/ExampleScreenshotTest.java

e: ../app/src/androidTest/java/kt/test/instrumental/screenshots/specs/TestLandingSpec.kt: (26, 33): Unresolved reference: create
:kt-app:compileDevStagingAndroidTestKotlin FAILED

Link to Code

Spec

@LayoutSpec
object LandingSpec {

    @OnCreateLayout
    fun onCreateLayout(context: ComponentContext) : Component {
        return Row
                .create(context)
                .backgroundRes(R.color.color_white)
                .widthPercent(100f)
                .heightPercent(100f)
                .child(
                        Image.create(context)
                                .drawableRes(R.drawable.ic_splash_screen)
                )
                .justifyContent(YogaJustify.CENTER)
                .alignItems(YogaAlign.CENTER)
                .build()
    }
}

Test

class TestLandingSpec {

    @Test
    fun testLanding() {
        val context = InstrumentationRegistry.getInstrumentation().targetContext

        val li = LayoutInflater.from(context)

        val lithoView = li.inflate(R.layout.test_litho_view, null, false) as LithoView

        val component = Landing.create(lithoView.componentContext).build()

        lithoView.setComponent(component)

        ViewHelpers.setupView(lithoView).setExactWidthDp(360).setExactHeightDp(640).layout()
        Screenshot.snap(lithoView).record()
    }
}

But it works when:

• i create component without generated code val component = LandingSpec.onCreateLayout(lithoView.componentContext)
• i create screenshot of whole activity with this component

[pavlospt]

Okay I managed to find a solution for your case! There seems to be a bug somewhere (not sure where though).

Solution is consisted of two parts:

1. You need to add kaptAndroidTest 'com.facebook.litho:litho-processor:0.15.0' so that it can invoke the kapt AP for androidTest related tasks as well!

2. Regarding the issue I mentioned above, it seems that generated files are not properly copied over to kapt generated sources folder.

Add the following on your app’s module build.gradle:

task copyTestClasses(type: Copy) {
  from "build/generated/source/kapt/debug"
  into "build/generated/source/kapt/debugAndroidTest"
}

afterEvaluate {
  compileDebugAndroidTestKotlin.dependsOn copyTestClasses
}

What this does, is before running compileDebugAndroidTestKotlin task it copies the generated .java files over to the androidTest folder, in order for the test to be able to find those classes on runtime.

Edit 1: Seems that this won’t work properly when combined with clean, so we modify the copyTestClasses task in order to force connectedDebugAndroidTestKotlin to wait for the classes to be copied, before executing.

task copyTestClasses(type: Copy) {
    from "build/generated/source/kapt/debug"
    into "build/generated/source/kapt/debugAndroidTest"
    mustRunAfter "kaptDebugAndroidTestKotlin"
}

[pavlospt]

Hey @just-kip seems that indeed ./gradlew clean connectedDebugAndroidTest does not work properly. I have modified the copyTestClasses task in order to make it run always after kaptDebugAndroidTestKotlin and since compileDebugAndroidTestKotlin depends on it, it waits until it copies those classes over, before running.

Here is the modified task:

task copyTestClasses(type: Copy) {
    from "build/generated/source/kapt/debug"
    into "build/generated/source/kapt/debugAndroidTest"
    mustRunAfter "kaptDebugAndroidTestKotlin"
}