    public void testInvalidTemperatureInCelsius() throws Throwable {
        runTestOnUiThread(new Runnable() {
            @Override
            public void run() {
                celsiusInput.requestFocus();
            }
        });
        getInstrumentation().waitForIdleSync();

        // temp less than ABSOLUTE_ZERO_C
        sendKeys("MINUS 3 8 0");

        String msg = "Expected celsius input to contain an error msg";
        assertNotNull(msg, celsiusInput.getError());
    }