@Test
public void testFormatLogMessage_code_and_message_is_null() {

    // do setup.
    String code = null;
    String message = null;
    // do test.
    String actualLogMessage = testTarget.formatLogMessage(code, message);
    // do assert.
    String expectedLogMessage = "[UNDEFINED-CODE] UNDEFINED-MESSAGE";
    assertThat(actualLogMessage, is(expectedLogMessage));
}