--- /dev/null
+++ libmalloc/libmalloc-140.50.6/tests/magazine_small_test.c
@@ -0,0 +1,131 @@
+//
+//  magazine_tiny_test.c
+//  libmalloc
+//
+//  Created by Matt Wright on 8/22/16.
+//
+//
+
+#include <darwintest.h>
+
+#include "../src/magazine_small.c"
+#include "magazine_testing.h"
+
+static inline void
+test_rack_setup(rack_t *rack)
+{
+	memset(rack, 'a', sizeof(rack));
+	rack_init(rack, RACK_TYPE_SMALL, 1, 0);
+	T_QUIET; T_ASSERT_NOTNULL(rack->magazines, "magazine initialisation");
+}
+
+T_DECL(basic_small_alloc, "small rack init and alloc")
+{
+	struct rack_s rack;
+	test_rack_setup(&rack);
+
+	void *ptr = small_malloc_should_clear(&rack, SMALL_MSIZE_FOR_BYTES(512), false);
+	T_ASSERT_NOTNULL(ptr, "allocation");
+
+	region_t *rgn = small_region_for_ptr_no_lock(&rack, ptr);
+	T_ASSERT_NOTNULL(rgn, "allocation region found in rack");
+
+	size_t sz = small_size(&rack, ptr);
+	T_ASSERT_EQ((int)sz, 512, "size == 32");
+}
+
+T_DECL(basic_tiny_teardown, "small rack init, alloc, teardown")
+{
+	struct rack_s rack;
+	test_rack_setup(&rack);
+
+	void *ptr = small_malloc_should_clear(&rack, TINY_MSIZE_FOR_BYTES(512), false);
+	T_ASSERT_NOTNULL(ptr, "allocation");
+
+	rack_destroy_regions(&rack, SMALL_REGION_SIZE);
+	for (int i=0; i < rack.region_generation->num_regions_allocated; i++) {
+		T_QUIET;
+		T_ASSERT_TRUE(rack.region_generation->hashed_regions[i] == HASHRING_OPEN_ENTRY ||
+					  rack.region_generation->hashed_regions[i] == HASHRING_REGION_DEALLOCATED,
+					  "all regions destroyed");
+	}
+
+	rack_destroy(&rack);
+	T_ASSERT_NULL(rack.magazines, "magazines destroyed");
+}
+
+T_DECL(basic_small_free, "small free")
+{
+	struct rack_s rack;
+	test_rack_setup(&rack);
+
+	void *ptr = small_malloc_should_clear(&rack, SMALL_MSIZE_FOR_BYTES(512), false);
+	T_ASSERT_NOTNULL(ptr, "allocation");
+
+	// free doesn't return an error (unless we assert here)
+	free_small(&rack, ptr, SMALL_REGION_FOR_PTR(ptr), 0);
+
+	size_t sz = small_size(&rack, ptr);
+	T_ASSERT_EQ((int)sz, 0, "allocation freed (sz == 0)");
+}
+
+T_DECL(basic_small_shrink, "small rack shrink")
+{
+	struct rack_s rack;
+	test_rack_setup(&rack);
+
+	void *ptr = small_malloc_should_clear(&rack, SMALL_MSIZE_FOR_BYTES(1024), false);
+	T_ASSERT_NOTNULL(ptr, "allocation");
+
+	size_t sz = small_size(&rack, ptr);
+	T_ASSERT_EQ((int)sz, 1024, "size == 1024");
+
+	void *nptr = small_try_shrink_in_place(&rack, ptr, sz, 512);
+	size_t nsz = small_size(&rack, nptr);
+	T_ASSERT_EQ_PTR(ptr, nptr, "ptr == nptr");
+	T_ASSERT_EQ((int)nsz, 512, "nsz == 512");
+}
+
+T_DECL(basic_small_realloc_in_place, "small rack realloc in place")
+{
+	struct rack_s rack;
+	test_rack_setup(&rack);
+
+	void *ptr = small_malloc_should_clear(&rack, SMALL_MSIZE_FOR_BYTES(512), false);
+	T_ASSERT_NOTNULL(ptr, "allocation");
+
+	size_t sz = small_size(&rack, ptr);
+	T_ASSERT_EQ((int)sz, 512, "size == 512");
+
+	// Due to <rdar://problem/28032870>, we can't just do alloc+realloc here because
+	// the allocator won't see the remainder of the region as free (the
+	// mag_bytes_free_at_end section is marked as busy and realloc doesn't check
+	// for it).
+
+	// On top of that, <rdar://problem/28033016> means we can't do
+	// alloc+alloc+free+realloc because the free'd block gets put in the small cache
+	// and the realloc path *also* doesn't check that. That means to actually do a
+	// fast-path realloc you need to:
+
+	//   1. alloc three times (to get the blocks out of the free_at_end region)
+	//   2. free the logically consecutive block
+	//   3. free any other block, to get the consecutive block out of the small cache
+
+	void *ptr2 = small_malloc_should_clear(&rack, SMALL_MSIZE_FOR_BYTES(512), false);
+	T_ASSERT_NOTNULL(ptr2, "allocation 2");
+	T_ASSERT_EQ_PTR(ptr2, (void *)((uintptr_t)ptr + 512), "sequential allocations");
+
+	void *ptr3 = small_malloc_should_clear(&rack, SMALL_MSIZE_FOR_BYTES(512), false);
+	T_ASSERT_NOTNULL(ptr3, "allocation 3");
+
+	free_small(&rack, ptr2, SMALL_REGION_FOR_PTR(ptr2), 0);
+	free_small(&rack, ptr3, SMALL_REGION_FOR_PTR(ptr3), 0);
+
+	// attempt to realloc up to 1024 bytes, this should happen in place
+	// as the rack is otherwise completely empty
+	boolean_t reallocd = small_try_realloc_in_place(&rack, ptr, sz, 1024);
+	T_ASSERT_TRUE(reallocd, "realloced");
+
+	size_t nsz = small_size(&rack, ptr);
+	T_ASSERT_EQ((int)nsz, 1024, "realloc size == 1024");
+}