Debug tests

The main way to solve problems in your tests is to look at the semantics tree. Print the tree by calling composeTestRule.onRoot().printToLog() at any point in your test. This function prints a log like this:

Node #1 at (...)px
 |-Node #2 at (...)px
   OnClick = '...'
   MergeDescendants = 'true'
    |-Node #3 at (...)px
    | Text = 'Hi'
    |-Node #5 at (83.0, 86.0, 191.0, 135.0)px
      Text = 'There'

These logs contain valuable information for tracking bugs down.

Additional Resources

Test apps on Android: The main Android testing landing page provides a broader view of testing fundamentals and techniques.
Fundamentals of testing: Learn more about the core concepts behind testing an Android app.
Local tests: You can run some tests locally, on your own workstation.
Instrumented tests: It is good practice to also run instrumented tests. That is, tests that run directly on-device.
Continuous integration: Continuous integration lets you integrate your tests into your deployment pipeline.
Test different screen sizes: With some many devices available to users, you should test for different screen sizes.
Espresso: While intended for View-based UIs, Espresso knowledge can still be helpful for some aspects of Compose testing.