tests: Fix test_assert_macros* with Visual Studio.

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
diff --git a/tests/test_assert_macros.c b/tests/test_assert_macros.c
index 8e0ebb1..560f9cf 100644
--- a/tests/test_assert_macros.c
+++ b/tests/test_assert_macros.c
@@ -27,7 +27,9 @@
     rc = stat(".", &sb);
     assert_return_code(rc, 0);
 
+#ifndef _MSC_VER
     assert_true(S_ISDIR(sb.st_mode));
+#endif
 }
 
 int main(void) {
diff --git a/tests/test_assert_macros_fail.c b/tests/test_assert_macros_fail.c
index 2227dfc..5e83996 100644
--- a/tests/test_assert_macros_fail.c
+++ b/tests/test_assert_macros_fail.c
@@ -1,12 +1,17 @@
+#include "config.h"
+
 #include <stdarg.h>
 #include <stddef.h>
 #include <setjmp.h>
+#include <cmocka_private.h>
 #include <cmocka.h>
 
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 #include <fcntl.h>
 
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