android instrumentationTest grant permissions

MyTest.java

@RunWith(AndroidJUnit4.class)
@LargeTest
public class MyTest {
    @Before
    public void grantPhonePermission() {
        // In M+, trying to call a number will trigger a runtime dialog. Make sure
        // the permission is granted before running this test.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            getInstrumentation().getUiAutomation().executeShellCommand(
                    "pm grant " + getTargetContext().getPackageName()
                            + " android.permission.CALL_PHONE");
        }
    }

}