fix: get exit code from the constant

Author: itkovian

test/nagios_simple.py

@@ -180,7 +180,7 @@ def test_cache(self):
             line = buffer.getvalue().rstrip()
             logging.info("Retrieved buffer value: %s", line)
             logging.info("Retrieved exit code: %s", err.code)
-            logging.info("Expected exit value: %s", (1, "WARNING"))
+            logging.info("Expected exit value: %s", (NAGIOS_EXIT_WARNING[0], NAGIOS_EXIT_WARNING[1]))
             self.assertTrue(err.code == 1)
             self.assertTrue(line == "%s %s" % ("WARNING", message))