Retrieves the task that compiles the Java sources of the android app so that the tests tasks
can depend on it and the correct order of task execution takes place.
Retrieves the task that merges the resources for the test apk so that the tests tasks can
depend on it and trigger the resources merging and also for the correct order of task execution
takes place.
Retrieves the Classpath used to compile the tests which includes the testCompile configuration,
the app's class files, the app's classpath and a configuration for each flavor.
Retrieves the Runpath which includes the classpath, the processsed resources and the
destination dir of the compilation, that is, where the tests' class files are.