How to run android CTS test case?

Which build tool is used internally at Google or other tech houses to test and run sanity check against Android applications?

• As the source directory <root>/src and <root>/tests/<android_test_project> are quite uncommon with the standard maven folder structure, I am wondering which suite of software is used to test and run continuous testing at tech companies such as Google, Facebook or Twitter. Furthermore, the VM is not standard and as such mocking framework are difficult to use and the packaging requires conversion and so forth. Handling the lifecycle of testing and delivery for android based projects can be difficult. Which tools are used in the field?

• Answer:

  Well, Google of course pushes a JUnit based test framework. In order to run any Android specific tests using this framework, however, you have to be plugged in to a device or emulator. Then there's Robolectric which fills in the stubs for the Android SDK so that you can make Android specific tests and run them in your own computer's VM. This is obviously much faster, but could be error prone.