tests: exit with error on win32 leakcheck

src/win32/w32_leakcheck.c

@@ -558,6 +558,11 @@ static void git_win32_leakcheck_global_shutdown(void)
 	git_win32_leakcheck_stack_cleanup();
 }
 
+bool git_win32_leakcheck_has_leaks(void)
+{
+	return (g_transient_count_total_leaks > 0);
+}
+
 int git_win32_leakcheck_global_init(void)
 {
 	git_win32_leakcheck_stacktrace_init();

src/win32/w32_leakcheck.h

@@ -21,6 +21,8 @@ int git_win32_leakcheck_global_init(void);
 #include "git2/errors.h"
 #include "strnlen.h"
 
+bool git_win32_leakcheck_has_leaks(void);
+
 /* Stack frames (for stack tracing, below) */
 
 /**

tests/main.c

 #include "clar_libgit2.h"
 #include "clar_libgit2_trace.h"
 
+#ifdef GIT_WIN32_LEAKCHECK
+# include "win32/w32_leakcheck.h"
+#endif
+
 #ifdef _WIN32
 int __cdecl main(int argc, char *argv[])
 #else
@@ -29,6 +33,11 @@ int main(int argc, char *argv[])
 	cl_global_trace_disable();
 	git_libgit2_shutdown();
 
+#ifdef GIT_WIN32_LEAKCHECK
+	if (git_win32_leakcheck_has_leaks())
+		res = res || 1;
+#endif
+
 	at_exit_cmd = getenv("CLAR_AT_EXIT");
 	if (at_exit_cmd != NULL) {
 		int at_exit = system(at_exit_cmd);