Android org.roblectric.res.ResBundle$Value.compareTo（ResBundle.java:189）上的机器人间歇性NPE崩溃故障

我在运行测试时间歇性失败

java.lang.NullPointerException
    at org.robolectric.res.ResBundle$Value.compareTo(ResBundle.java:189)
    at org.robolectric.res.ResBundle$Value.compareTo(ResBundle.java:166)
    at java.util.ComparableTimSort.countRunAndMakeAscending(ComparableTimSort.java:320)
    at java.util.ComparableTimSort.sort(ComparableTimSort.java:188)

关于下面的代码

@RunWith(RobolectricGradleTestRunner::class)
@Config(constants = BuildConfig::class, sdk = intArrayOf(21), packageName = "my.package")
class MyActivityTest {
    lateinit var myActivity : MyActivity

    @Before
    fun setup() {
        myActivity = MyActivity()
    }
}

特别是在线

        myActivity = MyActivity()

显然，解决办法是

@RunWith(RobolectricGradleTestRunner::class)
@Config(constants = BuildConfig::class, sdk = intArrayOf(21), packageName = "my.package")
class MyActivityTest {
    lateinit var myActivity : MyActivity

    @Before
    fun setup() {
        myActivity = Robolectric.buildActivity(MyActivity::class.java).get()
    }
}