我在仓库类中有一个简单的函数，该函数将解析来自资产的静态响应并返回结果。我试着写一个单元测试的功能，但不知何故，我的测试失败。下面给出代码片段。
repo函数：

override suspend fun fetchTasks(): ApiResponse<TaskListData> {
        val parsedResponse = context.parseJsonFile("tasks.json")
        val result = parsedResponse?.fromJson<TaskListData>()
        response =
            if (result != null) ApiResponse.Success(result)
            else ApiResponse.Failed(Throwable("Response Parsing Failed"))
        return response
}

我的测试功能：

@get:Rule
    val coroutineTestRule = MainCoroutineRule()
    private val context: Context = mockk<Context>(relaxed = true)
    // Create an instance of the class being tested
    private val fetchTasksRepositoryImpl = FetchTasksRepositoryImpl(context)
    
    @Test
    fun `fetchTasks returns expected response`() = runTest {
        // given
        val testParsedResponse = "Test Response"
        val fileName = "tasks.json"
        every { context.parseJsonFile(fileName) } returns testParsedResponse
        every { context.assets.open(fileName) } returns testParsedResponse.byteInputStream()
        every { testParsedResponse.fromJson<TaskListData>() } returns TaskListData(
            listOf()
        )
        
        val actualResponse = fetchTasksRepositoryImpl.fetchTasks()
        // Assert that the actual response is equal to the mock response
        assertTrue(actualResponse is ApiResponse.Success)
    }

json解析函数：

fun Context.parseJsonFile(fileName: String): String? {
    return try {
        val inputStream: InputStream = this.assets.open(fileName)
        val size: Int = inputStream.available()
        val buffer = ByteArray(size)
        inputStream.read(buffer)
        inputStream.close()
        String(buffer, Charsets.UTF_8)
    } catch (ex: IOException) {
        ex.printStackTrace()
        null
    }
}

错误当前我得到

Reported exception:
java.lang.NullPointerException: Cannot invoke "String.equals(Object)" because "<local2>" is null
    at ch.qos.logback.core.android.AndroidContextUtil.getMountedExternalStorageDirectoryPath(Unknown Source)
    at ch.qos.logback.core.android.AndroidContextUtil.setupProperties(Unknown Source)
    at ch.qos.logback.classic.util.ContextInitializer.autoConfig(Unknown Source)
    at org.slf4j.impl.StaticLoggerBinder.init(Unknown Source)
    at org.slf4j.impl.StaticLoggerBinder.<clinit>(Unknown Source)
    at java.base/java.lang.Class.forName0(Native Method)
    at java.base/java.lang.Class.forName(Unknown Source)
    at io.mockk.impl.log.JvmLogging.slf4jOrJulLogging(JvmLogging.kt:10)
    at io.mockk.impl.JvmMockKGateway.<clinit>(JvmMockKGateway.kt:160)
io.mockk.MockKException: Missing calls inside every { ... } block.
    at app//io.mockk.impl.recording.states.StubbingState.checkMissingCalls(StubbingState.kt:14)
    at app//io.mockk.impl.recording.states.StubbingState.recordingDone(StubbingState.kt:8)
    at app//io.mockk.impl.recording.CommonCallRecorder.done(CommonCallRecorder.kt:47)
    at app//io.mockk.impl.eval.RecordedBlockEvaluator.record(RecordedBlockEvaluator.kt:60)
    at app//io.mockk.impl.eval.EveryBlockEvaluator.every(EveryBlockEvaluator.kt:30)
    at app//io.mockk.MockKDsl.internalEvery(API.kt:92)
    at app//io.mockk.MockKKt.every(MockK.kt:104)

纠正我，我现在做错了什么！最好的解决方案是有帮助的。