Introduce golden file mechanism for tests

v0/test.c

@@ -29,6 +29,44 @@ void assert_log(const char* expected, const char* msg) {
     assert_str(expected, s_logOutput, msg);
 }
 
+void assert_log_file(const char* filepath, const char* msg) {
+    const char* generate = getenv("GENERATE_GOLDEN");
+    if (generate && strcmp(generate, "1") == 0) {
+        FILE* f = fopen(filepath, "w");
+        if (!f) {
+            fail("could not open golden file for writing");
+            return;
+        }
+        fputs(s_logOutput ? s_logOutput : "", f);
+        fclose(f);
+        return;
+    }
+
+    FILE* f = fopen(filepath, "r");
+    if (!f) {
+        fail("could not open golden file for reading");
+        return;
+    }
+
+    fseek(f, 0, SEEK_END);
+    long size = ftell(f);
+    fseek(f, 0, SEEK_SET);
+
+    char* content = malloc(size + 1);
+    if (!content) {
+        fclose(f);
+        fail("could not allocate memory for golden file content");
+        return;
+    }
+
+    fread(content, 1, size, f);
+    content[size] = '\0';
+    fclose(f);
+
+    assert_str(content, s_logOutput, msg);
+    free(content);
+}
+
 static void log_append(const char* msg) {
     size_t oldLen = s_logOutput ? strlen(s_logOutput) : 0;
     size_t newLen = oldLen + strlen(msg) + 1;
@@ -75,7 +113,6 @@ static TestCase s_tests[] = {
     {"parser_module_name", test_parser_module_name},
     {"log_error", test_log_error},
     {"log_on_line", test_log_on_line},
-    {"log_on_line_format", test_log_on_line_format},
 };