Add a test for ConnectivityFrameworkInitializer

The test verifies that system services were registered, meaning that
ConnectivityFrameworkInitializer.registerServiceWrappers ran
successfully on startup, and that calling it afterwards throws.

Bug: 171540887
Test: atest ConnectivityFrameworkInitializerTest
Original-Change: https://android-review.googlesource.com/1675598
Merged-In: I485b0dbd2e9dc557560a2b7bee2cff54c7f66c93
Change-Id: I485b0dbd2e9dc557560a2b7bee2cff54c7f66c93
1 file changed