The BigtableEmulatorRule manages the lifecycle of the Bigtable Emulator. Before the start
of a test, the emulator will be started on a random port and will be shutdown after the test
finishes.
Example usage:
{@literal @RunWith(JUnit4.class)}
public class MyTest {
{@literal @Rule}
public final BigtableEmulatorRule bigtableEmulator = BigtableEmulatorRule.create();
{@literal @Test}
public void testUsingEmulator() {
ManagedChannel adminChannel = bigtableEmulator.getAdminChannel();
// Do something with channel
}