Add tests for negative thresholds in test_utils

Thanks dermoth - https://github.com/monitoring-plugins/monitoring-plugins/commit/bc92b9392009766441c67b06398e6925cc45c2aa

lib/tests/test_utils.c

@@ -38,7 +38,7 @@ main (int argc, char **argv)
 	state_data *temp_state_data;
 	time_t	current_time;
 
-	plan_tests(172);
+	plan_tests(185);
 
 	ok( this_nagios_plugin==NULL, "nagios_plugin not initialised");
 
@@ -182,6 +182,21 @@ main (int argc, char **argv)
 	ok( get_status(30.0001, thresholds) == STATE_WARNING, "30.0001 - warning");
 	ok( get_status(69, thresholds) == STATE_CRITICAL, "69 - critical");
 
+	rc = _set_thresholds(&thresholds, "-10:-2", "-30:20");
+	ok( rc == 0, "Thresholds ('-30:20', '-10:-2') set");
+	ok( thresholds->warning->start == -10, "Warning start set correctly");
+	ok( thresholds->warning->end == -2, "Warning end set correctly");
+	ok( thresholds->critical->start == -30, "Critical start set correctly");
+	ok( thresholds->critical->end == 20, "Critical end set correctly");
+	ok( get_status(-31, thresholds) == STATE_CRITICAL, "-31 - critical");
+	ok( get_status(-29, thresholds) == STATE_WARNING, "-29 - warning");
+	ok( get_status(-11, thresholds) == STATE_WARNING, "-11 - warning");
+	ok( get_status(-10, thresholds) == STATE_OK, "-10 - ok");
+	ok( get_status(-2, thresholds) == STATE_OK, "-2 - ok");
+	ok( get_status(-1, thresholds) == STATE_WARNING, "-1 - warning");
+	ok( get_status(19, thresholds) == STATE_WARNING, "19 - warning");
+	ok( get_status(21, thresholds) == STATE_CRITICAL, "21 - critical");
+
 	char *test;
 	test = np_escaped_string("bob\\n");
 	ok( strcmp(test, "bob\n") == 0, "bob\\n ok");
@@ -438,9 +453,9 @@ main (int argc, char **argv)
 
 	np_cleanup();
 
-	ok( this_nagios_plugin==NULL, "Free'd this_nagios_plugin" );
+	ok(this_nagios_plugin==NULL, "Free'd this_nagios_plugin" );
 
-	ok( np_suid() == FALSE, "test aren't suid" );
+	ok(np_suid() == FALSE, "Tests aren't suid" );
 
 	/* base states with random case */
 	char *states[] = {