test: Add option to display all available tests

Useful option to avoid opening the large tests.c file just to find
the test case you want to run.

Author: furszy

src/unit_test.c

@@ -81,6 +81,7 @@ static void help(void) {
     printf("Run the test suite for the project with optional configuration.\n\n");
     printf("Options:\n");
     printf("    --help, -h                           Show this help message\n");
+    printf("    --list_tests, -l                     Display list of all available tests and modules\n");
     printf("    --jobs=<num>, -j=<num>               Number of parallel worker processes (default: 0 = sequential)\n");
     printf("    --iterations=<num>, -i=<num>         Number of iterations for each test (default: 16)\n");
     printf("    --seed=<hex>                         Set a specific RNG seed (default: random)\n");
@@ -95,6 +96,24 @@ static void help(void) {
     printf("    - Iterations and seed can also be passed as positional arguments before any other argument for backward compatibility.\n");
 }
 
+/* Print all tests in registry */
+static void print_test_list(struct tf_framework* tf) {
+    int m, t, total = 0;
+    printf("\nAvailable tests (%d modules):\n", tf->num_modules);
+    printf("========================================\n");
+    for (m = 0; m < tf->num_modules; m++) {
+        const struct tf_test_module* mod = &tf->registry_modules[m];
+        printf("Module: %s (%d tests)\n", mod->name, mod->size);
+        for (t = 0; t < mod->size; t++) {
+            printf("\t[%3d] %s\n", total + 1, mod->data[t].name);
+            total++;
+        }
+        printf("----------------------------------------\n");
+    }
+    printf("\nRun specific module: ./tests -t=<module_name>\n");
+    printf("Run specific test: ./tests -t=<test_name>\n\n");
+}
+
 static int parse_jobs_count(const char* key, const char* value, struct tf_framework* tf) {
     char* ptr_val;
     long val = strtol(value, &ptr_val, 10); /* base 10 */
@@ -180,7 +199,7 @@ static int parse_target(const char* key, const char* value, struct tf_framework*
         if (add_all) return 0;
     }
     fprintf(stderr, "Error: target '%s' not found (missing or module disabled).\n"
-                    "Run program with -print_tests option to display available tests and modules.\n", value);
+                    "Run program with -list_tests option to display available tests and modules.\n", value);
     return -1;
 }
 
@@ -211,6 +230,10 @@ static int read_args(int argc, char** argv, int start, struct tf_framework* tf)
                 tf->args.help = 1;
                 return 0;
             }
+            if (strcmp(key, "l") == 0 || strcmp(key, "list_tests") == 0) {
+                tf->args.list_tests = 1;
+                return 0;
+            }
             fprintf(stderr, "Invalid arg '%s': must be -k=value or --key=value\n", raw_arg);
             return -1;
         }
@@ -324,6 +347,7 @@ static int tf_init(struct tf_framework* tf, int argc, char** argv)
     tf->args.custom_seed = NULL;
     tf->args.help = 0;
     tf->args.targets.size = 0;
+    tf->args.list_tests = 0;
 
     /* Disable buffering for stdout to improve reliability of getting
      * diagnostic information. Happens right at the start of main because
@@ -360,6 +384,11 @@ static int tf_init(struct tf_framework* tf, int argc, char** argv)
             help();
             exit(EXIT_SUCCESS);
         }
+
+        if (tf->args.list_tests) {
+            print_test_list(tf);
+            exit(EXIT_SUCCESS);
+        }
     }
 
     return EXIT_SUCCESS;

src/unit_test.h

@@ -77,6 +77,8 @@ struct tf_args {
     const char* custom_seed;
     /* Whether to print the help msg */
     int help;
+    /* Whether to print the tests list msg */
+    int list_tests;
     /* Target tests indexes */
     struct tf_targets targets;
 };