tests: Introduce chxml2xmlmock

As of previous commit, the CH driver checks for /dev/kvm and/or
/dev/mshv presence. In order to make chxml2xmltest work
regardless of host configuration, introduce a mock that pretends
both of these files are accessible.

Fixes: 51c14df967
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>

tests/chxml2xmlmock.c

@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2024 Red Hat, Inc.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#include <config.h>
+#include <unistd.h>
+
+#include "internal.h"
+#include "virfile.h"
+
+bool
+virFileExists(const char *path)
+{
+    if (STREQ(path, "/dev/kvm"))
+        return true;
+    if (STREQ(path, "/dev/mshv"))
+        return true;
+    return access(path, F_OK) == 0;
+}

tests/chxml2xmltest.c

@@ -74,4 +74,4 @@ mymain(void)
     return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
 }
 
-VIR_TEST_MAIN(mymain)
+VIR_TEST_MAIN_PRELOAD(mymain, VIR_TEST_MOCK("chxml2xml"))

tests/meson.build

@@ -350,6 +350,9 @@ if conf.has('WITH_CH')
   tests += [
     { 'name': 'chxml2xmltest', 'link_with': [ ch_driver_impl ] },
   ]
+  mock_libs += [
+    { 'name': 'chxml2xmlmock' },
+  ]
 endif
 
 if conf.has('WITH_ESX')