BusyBee - Tell Espresso when it needs to be patient because your app is busy 🐝

BusyBee is an alternative API for IdlingResources in Espresso tests. You can use BusyBee instead of CountingIdlingResource to get better log messages and improve your ability to debug problems related to IdlingResources.

BusyBee is meant to be used with Espresso. You use BusyBee inside the "app under test". It allows the "app under test" to tell Espresso when it is busyWith an operation and, conversely, allows the app to tell Espresso when the operation is completed. Tracking busyWith/completed helps your Espresso tests be fast and reliable.

If you write Espresso tests, proper use of the IdlingResource API is critical for ensuring that your tests are fast and reliable. IdlingResource can be hard to use correctly and it can be hard to understand what is happening with your IdlingResources when you are debugging problems with your tests. That is where BusyBee comes in.

Comparison with CountingIdlingResource

In some ways, BusyBee is similar to CountingIdlingResource, but it does have some notable advantages:

Rather than track only the number of operations in progress, BusyBee keeps track of the set of operations currently in progress. In progress operations are represented by a Java object, which could be a string, request object, etc. This allows for easier debugging, as it allows you to inspect the set of in progress operations across the whole app.
When Espresso times out because the app is busy, your logs can show the list of in progress operations.
BusyBee lets you separately enable/disable tracking of specific categories of operations (e.g. NETWORK operations)
The BusyBee#completed(thing) method is idempotent (CountingIdlingResource#decrement is not). This is useful when you have unreliable/multiple signals (e.g. WebView) to tell you that an operation has completed. Also, you can completed(thing) even if you never were busyWith(thing)

Trade-off: While there are a number of advantages listed above, the downside of BusyBee (and CountingIdlingResource) is that you are modifying your app under test for purely testing purposes.

How to use BusyBee

Include the BusyBee dependencies in your build.gradle files. When tests are not running, the no-op implementation is automatically used to minimize overhead of BusyBee (since it is only needed during tests).

Find the latest version on Maven Central

Required: For Android modules:

    implementation 'io.americanexpress.busybee:busybee-android:$version'

Optional: Only needed, if you want to use BusyBee in a non-Android module:

    implementation 'io.americanexpress.busybee:busybee-core:$version'

BusyBee releases are available on Maven Central.

    repositories {
        exclusiveContent {
            forRepository { mavenCentral() }
            filter { includeGroup("io.americanexpress.busybee") }
        }
    }

On each merge to main, a -SNAPSHOT version is published to https://s01.oss.sonatype.org/content/repositories/snapshots/

Inside your app, tell BusyBee what operations your app is busyWith, and when that operation is completed.

    class BackgroundProcessor {
        private final BusyBee busyBee = BusyBee.singleton();

        void processThing(Thing thing){
            // Espresso will wait
            busyBee.busyWith(thing);
            try {
                thing.process();
            } finally {
                // Espresso will continue
                busyBee.completed(thing);
            }
        }
    }

That's all! Now Espresso will wait until your app is not busy before executing its actions and assertions.

BusyBeeExecutorWrapper

If you have an executor and you need Espresso to know the app is "busy" anytime that executor is executing something, then you can wrap the Executor with BusyBeeExecutorWrapper. Operations executed with the wrapped Executor will cause BusyBee to be "busy" while they are in progress.

   Executor backgroundTasks;
   Executor busyBeeBackgroundTasks =
                         BusyBeeExecutorWrapper.with(busyBee)
                                               .wrapExecutor(backgroundTasks)
                                               .build();
    busyBeeBackgroundTasks.execute(operation);

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License

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americanexpress/busybee