@Test
public void decodeBlueReaderPacket_Battery_OldBgReading() {

    // :: Setup
    byte[] buffer = "battery: 4000 980".getBytes();
    // Add mock bg readings
    Sensor mockSensor = createMockSensor();
    addMockBgReading(125, 10, mockSensor);
    // :: Act
    byte[] reply = blueReader.decodeblueReaderPacket(buffer, -1);
    // :: Verify
    assertThat(reply).isNotNull();
    assertThat(new String(reply)).isEqualTo("l");
}