问如何在Android中为仪器化测试创建孤立的上下文

EN

@RunWith(AndroidJUnit4::class)
class AccountTest {

    private val ACCOUNT_TYPE = "com.android.account"

    private lateinit var accountManager: AccountManager

    @Before
    fun init() {
        accountManager = AccountManager.get(ApplicationProvider.getApplicationContext())
    }

    @Test
    fun addAccountTest(){
        val account = Account("test", ACCOUNT_TYPE)
        val result = accountManager.addAccountExplicitly(account, null, null)

        assertThat(result, `is`(true))
    }

    @Test
    fun getAccountTest() {
        val accountList = accountManager.getAccountsByType(ACCOUNT_TYPE).toList()

        assertThat(accountList.size, `is`(0))
    }
}