### Question:
CallbackHeader { public CallbackHeader() { } CallbackHeader();  CallbackHeader(String reqId, String respCode, String respMsg); String getRequestId(); void setRequestId(String value); String getResponseCode(); void setResponseCode(String value); String getResponseMessage(); void setResponseMessage(String value); @Override String toString();  }### Answer:
@Test public final void testCallbackHeader() { cb.setRequestId("413658f4-7f42-482e-b834-23a5c15657da-1474471336781"); cb.setResponseCode("200"); cb.setResponseMessage("OK"); assertNotNull(cb.getRequestId()); assertNotNull(cb.getResponseCode()); assertNotNull(cb.getResponseMessage()); assertEquals("413658f4-7f42-482e-b834-23a5c15657da-1474471336781", cb.getRequestId()); assertEquals("200", cb.getResponseCode()); assertEquals("OK", cb.getResponseMessage()); }