util - to read fake json response from src code for Instrumentation test cases. for eg., fake response in MockWebServer

FileReader.kt

object FileReader {

    fun readStringFromFile(fileName: String): String {
        try {
            val inputStream =
                (InstrumentationRegistry.getInstrumentation().targetContext.applicationContext as HiltTestApplication).assets.open(
                    fileName
                )
            val builder = StringBuilder()
            val reader = InputStreamReader(inputStream, "UTF-8")
            reader.readLines().forEach {
                builder.append(it)
            }
            return builder.toString()
        } catch (e: IOException) {
            throw e
        }
    }
}

Screenshot 2020-07-06 at 11.08.49 PM.png