Can you tell about test or demo systems you worked on at your previous workplace?

At my previous job, I participated in developing a test application to demonstrate the capabilities of a new API. It was an Android application that allowed quick testing of the main features of the service and visualizing the results.

Within the project, I implemented:

• UI with simple control elements for calling various API methods.
• Logging of requests and responses for debugging.
• Error handling and status display.

Such an application helped the team and clients quickly evaluate the service's performance without the need to write their own code.

Example code for calling the API in Android (Kotlin):

fun fetchData() {
    val client = OkHttpClient()
    val request = Request.Builder()
        .url("https://api.example.com/data")
        .build()

    client.newCall(request).enqueue(object : Callback {
        override fun onFailure(call: Call, e: IOException) {
            // handle error
        }

        override fun onResponse(call: Call, response: Response) {
            response.body?.string()?.let { data ->
                // update UI
            }
        }
    })
}