Esspresso assertThat requires addtional Matcher when verifying navigation

Issue

I am following Google's example to test my fragment with a mock navControllor. I'm doing everything the same and I am getting this error from Espresso when using assertThat.Error message I got

It appears that i need to pass in an additional matcher which is not in the example Google provide. I don't know why this matcher is needed.

My dependency versions:

androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

Any help is appreciated! Thanks!

Solution

The assertThat from the documentation comes from Truth, which you'd add to your project via that Gradle dependency:

androidTestImplementation "com.google.truth:truth:1.0.1"

Answered By - ianhanniballake