--- /dev/null
+++ libmalloc/libmalloc-646.40.3/tests/exclavekit/libmalloc_exclavekit_test.c
@@ -0,0 +1,62 @@
+#include <microtest/darwintest.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+/* zone functions */
+
+T_DECL(malloc_default_zone, "returns a non-null default zone") {
+    malloc_zone_t *dz = malloc_default_zone();
+    T_EXPECT_NOTNULL(dz);
+}
+
+T_DECL(malloc_zone_from_ptr, "returns a pointer from the default zone") {
+    void *ptr = malloc(1);
+    T_EXPECT_NOTNULL(ptr);
+    T_EXPECT_EQ(malloc_zone_from_ptr(ptr), malloc_default_zone());
+    free(ptr);
+}
+
+/* allocation functions */
+
+T_DECL(malloc_size, "returns a valid allocation size") {
+    const size_t sz = 1;
+    void *ptr = malloc(sz);
+    T_EXPECT_NOTNULL(ptr);
+    T_EXPECT_GE(malloc_size(ptr), sz);
+    free(ptr);
+}
+
+T_DECL(malloc, "returns a valid allocation") {
+    void *ptr = malloc(1);
+    T_EXPECT_NOTNULL(ptr);
+    free(ptr);
+}
+
+T_DECL(calloc, "returns a valid allocation") {
+    void *ptr = calloc(1, 1);
+    T_EXPECT_NOTNULL(ptr);
+    free(ptr);
+}
+
+T_DECL(valloc, "returns a page-aligned allocation") {
+    void *ptr = valloc(1);
+    T_EXPECT_NOTNULL(ptr);
+    T_EXPECT_EQ(((uintptr_t)ptr) % getpagesize(), 0ul);
+    free(ptr);
+}
+
+T_DECL(realloc, "returns a reallocated allocation") {
+    void *ptr = malloc(1);
+    T_EXPECT_NOTNULL(ptr);
+    void *new_ptr = realloc(ptr, 2);
+    T_EXPECT_NOTNULL(new_ptr);
+    free(new_ptr);
+}
+
+T_DECL(posix_memalign, "returns an aligned allocation") {
+    void *ptr = NULL;
+    T_EXPECT_EQ(posix_memalign(&ptr, 1, 16), 0);
+    T_EXPECT_NOTNULL(ptr);
+    T_EXPECT_EQ(((uintptr_t)ptr) % 16, 0ul);
+    free(ptr);
+}