ViewAssertion

interface ViewAssertion

Responsible for performing assertions on a View element.

This is considered part of the test framework public API - developers are free to write their own assertions as long as they meet the following requirements:

• Do not mutate the passed in view.
• Throw junit.framework.AssertionError when the view assertion does not hold.
• Implementation runs on the UI thread - so it should not do any blocking operations
• Downcasting the view to a specific type is allowed, provided there is a test that view is an instance of that type before downcasting. If not, an AssertionError should be thrown.
• It is encouraged to access non-mutating methods on the view to perform assertion.

Strongly consider using a existing ViewAssertion via the ViewAssertions utility class before writing your own assertion.

Summary

fun check(view: View!, noViewFoundException: NoMatchingViewException!): Unit