Buildkite Collectors for Android

Official Buildkite Test Analytics collectors for Android ✨

📦 Supported CI systems: Buildkite, GitHub Actions, CircleCI, and others via the BUILDKITE_ANALYTICS_* environment variables.

👉 Installing

Step 1 – Retrieve API Token

Create a test suite, and retrieve the API token. We’ll refer to this as API Token from here on.

Step 2 – Environment Variable

Create an environment variable with the key BUILDKITE_ANALYTICS_TOKEN and value of your API Token. This will need to be on your CI server, if running the BuildKite collector via CI, or otherwise on your local machine.

Step 3 – Unit Test Collector

In your top-level build.gradle.kts file, add the following to your classpath:

buildScript {
    dependencies {

Then, in your app-level build.gradle.kts, add the following plugin:

plugins {

That’s it!

Step 4 – Instrumented Test Collector

In your app-level build.gradle.kts file,

Add the following dependency:


android {
    defaultConfig {

Sync gradle, and rebuild the project to ensure the BuildConfig is generated.

Create the following class in your androidTest directory, i.e. src/androidTest/java/com/myapp/MyTestCollector.kt

class MyTestCollector : InstrumentedTestCollector(
    apiToken = BuildConfig.BUILDKITE_ANALYTICS_TOKEN

Again, in your app-level build.gradle.kts file, instruct Gradle to use your test collector:

testInstrumentationRunnerArguments += mapOf(
    "listener" to "com.mycompany.myapp.MyTestCollector" // Make sure to use the correct package name here

Note: This test collector uploads test data via the device under test. Make sure your Android device/emulator has network access.

⚒ Developing

The Android test collector is separated into two parts – one for instrumented tests, and another for unit tests.

Both parts upload tests via a common java library. See collector/test-data-uploader

Instrumented Tests

Instrumented tests run on an Android device, and gradle affords us the opportunity to pass testInstrumentationRunnerArguments to the test runner. We take advantage of this to pass our own custom test listener. This listener observes test runs, and calls our test uploader to publish results.

This listener is provided to the user as an Android library. See collector/instrumented-test-collector

At minimum, the test listener requires an API token in order to publish results to Buildkite’s servers.

Since the ‘environment’ is the app’s process / Android device, we can’t simply call System.getEnv() to reach environment variables. Instead, we have to pass env vars through from the CI/local machine, to the app’s process, via BuildConfig. And, since the env vars live on the end-user’s CI/local machine, we have to ask them to generate the BuildConfig from within their own app’s build.gradle, and then pass the config to their own subclass of the test listener. They then instruct gradle to use this test listener, which now has access to their BuildConfig, and most importantly, their API token.

Unit Tests

There’s no equivalent testInstrumentationRunnerArguments flag for unit tests – these run on the CI/local machine, rather than the Android device. JUnit doesn’t seem to offer any way to set a global test runner / test listener – instead, we’d need to ask the user to annotate each unit test with @RunWith(OurTestCollector::class). This is rather onerous for the end user. So, instead of using a JUnit test listener, we hook into the Gradle testing APIs, and add a test listener via Gradle.

This listener is provided to the user as a Gradle plugin. See collector/unit-test-collector

Note that there is no equivalent gradle API for instrumented tests, hence the two separate approaches.

Fortunately, since unit tests run on the CI/local machine, our Gradle plugin has direct access to environment variables, so no additional config is required.


👩‍💻 Contributing

Bug reports and pull requests are welcome on GitHub at

📜 License



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