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Cannot find a version of 'com.google.code.gson:gson' that satisfies the version constraints when using firestore

It does not occurred when remove implementation 'com.google.firebase:firebase-firestore:21.3.0' dependency in my gradle and It causes only when to test not to run app .

here is the full error message

Cannot find a version of 'com.google.code.gson:gson' that satisfies the version constraints: 
   Dependency path 'myapp:app:unspecified' --> 'androidx.room:room-testing:2.2.1' --> 'androidx.room:room-migration:2.2.1' --> 'com.google.code.gson:gson:2.8.0'
   Constraint path 'myapp:app:unspecified' --> 'com.google.code.gson:gson:{strictly 2.7}' because of the following reason: debugRuntimeClasspath uses version 2.7
   Dependency path 'myapp:app:unspecified' --> 'com.google.firebase:firebase-firestore:21.3.0' --> 'io.grpc:grpc-android:1.21.0' --> 'io.grpc:grpc-core:1.21.0' --> 'com.google.code.gson:gson:2.7'
What should I do?
First of all, you can always check your dependencies tree like this: gradlew app:dependencies (that's assuming your module in question is called app; for linux you will likely have to call it like this ./gradlew app:dependencies)
That said, your log seems to contain all you need already: room is using 2.8.0 and firebase is using 2.7. Please try to exclude gson transitive dependency, say, from room (exclude group: 'com.google.code.gson') and let's see if that helps.
                you mean like this?  androidTestImplementation ("androidx.room:room-testing:$rootProject.roomVersion") {         exclude group: 'com.google.code.gson'     }
– the1900
                Nov 19, 2019 at 4:10
                Unbelievable! It works! How did you know? I've not even know gradle can manage explictly manage sub dependency of dependency.
– the1900
                Nov 19, 2019 at 14:57
        
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