add usage() to the test_runner

test/test_runner.c

@@ -61,6 +61,15 @@ static suite_func suites[] = {
     restart_counter_suite
 };
 
+void
+usage(const char *progname)
+{
+    printf("Usage: %s [-h] [-k testcase] [-x]\n", progname);
+    puts("\t-h This help");
+    puts("\t-k testcase Run the given testcase");
+    puts("\t-x Ouput results in XML to the file result.xml");
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -68,7 +77,7 @@ main (int argc, char *argv[])
     int c;
     const char *test_case = NULL;
 
-    while ((c = getopt(argc, argv, "xk:")) != -1) {
+    while ((c = getopt(argc, argv, "xk:h")) != -1) {
         switch (c) {
             case 'x':
                 xml_output = 1;
@@ -77,8 +86,11 @@ main (int argc, char *argv[])
                 test_case = optarg;
                 break;
             default:
-                printf("Ignoring unknown option %c\n", c);
-                break;
+                printf("Unknown option %c\n", c);
+                /*fallthrough*/
+            case 'h':
+                usage(argv[0]);
+                return 1;
         }
     }