The Gradle dependencies for Java in the README.md over Repository https://jitpack.io/ are wrong and I assume the dependencies for kotlin too.
Corrected for Java:
dependencies {
testImplementation 'com.github.fabioCollini:DaggerMock:0.8.5'
//and/or
androidTestImplementation 'com.github.fabioCollini:DaggerMock:0.8.5'
// [...]
}