--- /dev/null
+++ Libc/Libc-1669.0.4/tests/fwrite.c
@@ -0,0 +1,26 @@
+#include <darwintest.h>
+#include <darwintest_utils.h>
+
+#include "libc_hooks_helper.h"
+
+T_DECL(libc_hooks_fwrite, "Test libc_hooks for fwrite")
+{
+    // Setup
+    T_SETUPBEGIN;
+    FILE *f = fopen("/dev/null", "w");
+    T_SETUPEND;
+
+    // Test
+    char buf[256] = "foo";
+    libc_hooks_log_start();
+    fwrite(buf, sizeof(buf), 1, f);
+    libc_hooks_log_stop(2);
+
+    // Check
+    T_LOG("fwrite(\"%s\", %zu, %zu, f)", buf, sizeof(buf), 1UL);
+    libc_hooks_log_expect(LIBC_HOOKS_LOG(libc_hooks_will_write, f, sizeof(*f)), "checking f");
+    libc_hooks_log_expect(LIBC_HOOKS_LOG(libc_hooks_will_read, buf, sizeof(buf)), "checking buf");
+
+    // Cleanup
+    fclose(f);
+}