@Test
public void clickLog100Button() throws Exception {

    clearLog(); // Otherwise our logcat command could show previous test-runs etc.
    onView(withId(R.id.log100)).perform(click()); // UI Action / Trigger logs
    String log = getLogs(); // Get all logs in logcat buffer for this app (could have logs from parallel executions, not just the line above)

    Log.d("LogTest", "Output from log reading has length: [" + log.length() + "]");

    Pattern mPattern = Pattern.compile("Logging 100 messages took [0-9]+ Milliseconds");

    Matcher matcher = mPattern.matcher(log);
    if(!matcher.find()) {
        throw new Exception("Logging was not detected!");
    } else {
        Log.i("LogTest", "ClickLog100Button Passed");
    }
}