Android Studio import existing unit tests “Unable to find instrumentation info”

If you have a testInstrumentationRunner defined in your build.gradle such as this:

android {
    defaultConfig {
        testInstrumentationRunner "com.google.android.apps.common.testing.testrunner.GoogleInstrumentationTestRunner"

make sure that in the run configuration window you use the exact same “Specific instrumentation runner” in your Android Studio / IntelliJ run configuration for your test.