t13-threads.c ported.

tests-clar/threads/basic.c

+#include "clar_libgit2.h"
+
+#include "cache.h"
+
+
+static git_repository *g_repo;
+
+void test_threads_basic__initialize(void) {
+   g_repo = cl_git_sandbox_init("testrepo");
+}
+
+void test_threads_basic__cleanup(void) {
+   cl_git_sandbox_cleanup();
+}
+
+
+void test_threads_basic__cache(void) {
+   // run several threads polling the cache at the same time
+   cl_assert(1 == 1);
+}