Add the ability to print out the list of test names (-l)

lib/isc/tests/task_test.c

@@ -1550,12 +1550,21 @@ main(int argc, char **argv) {
 						_teardown),
 	};
 	struct CMUnitTest selected[sizeof(tests) / sizeof(tests[0])];
+	size_t i;
 	int c;
 
 	memset(selected, 0, sizeof(selected));
 
-	while ((c = isc_commandline_parse(argc, argv, "t:v")) != -1) {
+	while ((c = isc_commandline_parse(argc, argv, "lt:v")) != -1) {
 		switch (c) {
+		case 'l':
+			for (i = 0; i < (sizeof(tests) / sizeof(tests[0])); i++)
+			{
+				if (tests[i].name != NULL) {
+					fprintf(stdout, "%s\n", tests[i].name);
+				}
+			}
+			return (0);
 		case 't':
 			if (!cmocka_add_test_byname(
 				    tests, isc_commandline_argument, selected))