test(rar): keep real fixtures in fixtures-real/ (make_fixtures wipes fixtures/)

tests/make_fixtures.py rmtree()s tests/fixtures on every run-tests.sh
invocation, silently deleting the real RAR fixtures. The WinRAR generator
now writes tests/fixtures-real/; run-tests.sh passes it as a third
argument to test-rar-extract, which resolves v6/volume/encrypted checks
against it and falls back to SKIP when absent.

tests/make-rar-fixtures.bat

@@ -1,8 +1,9 @@
 @echo off
 REM Generate real RAR fixtures for the v1.9 host test suite.
 REM Requires WinRAR command-line Rar.exe (ships with normal WinRAR install).
-REM Outputs into tests\fixtures\ - rerun any time fixture needs change.
-REM NOTE: keep this file pure ASCII (cmd.exe uses the ANSI codepage).
+REM Outputs into tests\fixtures-real\ - kept OUT of tests\fixtures\ because
+REM tests\make_fixtures.py wipes that directory on every test run.
+REM Rerun any time fixture needs change. NOTE: keep this file pure ASCII.
 setlocal EnableDelayedExpansion
 
 set RAREXE=
@@ -16,7 +17,9 @@ if "%RAREXE%"=="" (
 echo Using: %RAREXE%
 "%RAREXE%" 2>nul | findstr /c:"RAR " >nul || (echo [ERROR] %RAREXE% does not look like WinRAR & exit /b 1)
 
-set FIX=%~dp0fixtures
+set FIX=%~dp0fixtures-real
+if exist "%FIX%" rmdir /s /q "%FIX%"
+mkdir "%FIX%"
 set STAGE=%~dp0fixture-stage
 if exist "%STAGE%" rmdir /s /q "%STAGE%"
 mkdir "%STAGE%\dir" 2>nul

tests/run-tests.sh

@@ -96,4 +96,8 @@ RAR_LIBS=()
   "$BUILD/zip_extract.o" "${objs[@]}" "${rar_objs[@]}" "${RAR_LIBS[@]}"
 
 "$BUILD/test-zip-extract" "$ROOT/tests/fixtures" "$BUILD/work-zip"
-"$BUILD/test-rar-extract" "$ROOT/tests/fixtures" "$BUILD/work-rar"
+# Real RAR fixtures (v6 / multi-volume / encrypted) live in fixtures-real/,
+# generated by tests/make-rar-fixtures.bat (WinRAR required); fixtures/
+# itself is wiped by make_fixtures.py on every run.
+"$BUILD/test-rar-extract" "$ROOT/tests/fixtures" "$BUILD/work-rar" \
+  "$ROOT/tests/fixtures-real"

tests/test_rar_extract.c

@@ -28,6 +28,7 @@
 #include "posix_compat.h"
 
 static const char *g_fixtures;
+static const char *g_fixtures_real;
 static char g_work[4096];
 static int g_failures;
 static int g_checks;
@@ -37,6 +38,11 @@ fixture_path(char *out, size_t size, const char *name) {
   snprintf(out, size, "%s/%s", g_fixtures, name);
 }
 
+static void
+fixture_real_path(char *out, size_t size, const char *name) {
+  snprintf(out, size, "%s/%s", g_fixtures_real, name);
+}
+
 static void
 work_path(char *out, size_t size, const char *name) {
   snprintf(out, size, "%s/%s", g_work, name);
@@ -315,7 +321,7 @@ test_real_archives(void) {
     zipx_result_t res;
     zipx_status_t st;
     char src[4096];
-    fixture_path(src, sizeof(src), "basic-v6.rar");
+    fixture_real_path(src, sizeof(src), "basic-v6.rar");
     if(exists(src)) {
       memset(&res, 0, sizeof(res));
       st = rar_extract(src, dst, ZIPX_CONFLICT_FAIL,
@@ -343,7 +349,7 @@ test_real_archives(void) {
     zipx_result_t res;
     zipx_status_t st;
     char src[4096];
-    fixture_path(src, sizeof(src), "basic-rar4.rar");
+    fixture_real_path(src, sizeof(src), "basic-rar4.rar");
     if(exists(src)) {
       memset(&res, 0, sizeof(res));
       st = rar_extract(src, dst, ZIPX_CONFLICT_FAIL,
@@ -369,7 +375,7 @@ test_real_archives(void) {
     zipx_result_t res;
     zipx_status_t st;
     char src[4096];
-    fixture_path(src, sizeof(src), "vol.part1.rar");
+    fixture_real_path(src, sizeof(src), "vol.part1.rar");
     if(exists(src)) {
       memset(&res, 0, sizeof(res));
       st = rar_extract(src, dst, ZIPX_CONFLICT_FAIL,
@@ -396,7 +402,7 @@ test_real_archives(void) {
     zipx_result_t res;
     zipx_status_t st;
     char src[4096];
-    fixture_path(src, sizeof(src), "enc-v6.rar");
+    fixture_real_path(src, sizeof(src), "enc-v6.rar");
     if(exists(src)) {
       memset(&res, 0, sizeof(res));
       st = rar_extract(src, dst, ZIPX_CONFLICT_FAIL,
@@ -416,10 +422,12 @@ test_real_archives(void) {
 int
 main(int argc, char **argv) {
   if(argc < 3) {
-    fprintf(stderr, "usage: %s <fixtures-dir> <work-dir>\n", argv[0]);
+    fprintf(stderr, "usage: %s <fixtures-dir> <work-dir> [real-fixtures-dir]\n",
+            argv[0]);
     return 2;
   }
   g_fixtures = argv[1];
+  g_fixtures_real = (argc >= 4) ? argv[3] : argv[1];
   snprintf(g_work, sizeof(g_work), "%s", argv[2]);
   mkdir(g_work, 0777);