--- /dev/null
+++ libmalloc/libmalloc-474.0.13/tests/Makefile
@@ -0,0 +1,113 @@
+PROJECT := libmalloc
+TEST_DIR := tests/
+
+DEVELOPER_DIR ?= $(shell xcode-select -p)
+
+include $(DEVELOPER_DIR)/AppleInternal/Makefiles/darwintest/Makefile.common
+
+TRACE_FILES := \
+	$(notdir $(wildcard $(SRCROOT)/../traces/*.mtrace))
+
+# add trace files without the traces/ prefix, fex:
+#   exclude_this_file.mtrace
+EXCLUDED_TRACE_FILES :=
+
+CUSTOM_TARGETS = \
+	MALLOC_BENCH
+
+OTHER_TEST_TARGETS = \
+	$(addprefix nano-trace-replay_, $(basename $(filter-out $(EXCLUDED_TRACE_FILES), $(TRACE_FILES)))) 
+
+MALLOCBENCHTEST_DIR = $(SRCROOT)/MallocBenchTest
+BATS_PLISTS_EXTRACT = \
+	$(patsubst %,$(SYMROOT)/%.plist,$(OTHER_TEST_TARGETS))
+
+EXCLUDED_SOURCES := \
+	nano_trace_replay.c
+CXX := $(shell $(XCRUN) -sdk "$(TARGETSDK)" -find clang++)
+
+WARNING_CFLAGS := -Wno-format-invalid-specifier -Wno-format-extra-args
+OTHER_CFLAGS += \
+	-DDARWINTEST \
+	-DOS_UNFAIR_LOCK_INLINE=1 \
+	-DT_META_TAG_XZONE=T_META_TAG\(\"xzone\"\) \
+	-DT_META_TAG_XZONE_ONLY=T_META_TAG\(\"xzone_only\"\) \
+	-fno-builtin \
+	-fno-typed-memory-operations \
+	-lCrashReporterClient \
+	-I$(SDKROOT)/System/Library/Frameworks/System.framework/PrivateHeaders \
+	-I$(SRCROOT)/../private \
+	-I$(SRCROOT)/../include \
+	$(WARNING_CFLAGS)
+
+PRIVATE_FRAMEWORKS = $(SDKROOT)/System/Library/PrivateFrameworks
+PERFDATA_FRAMEWORK = perfdata
+
+nano-trace-replay_%: $(SRCROOT)/nano_trace_replay.c
+	$(CC) \
+		$(CFLAGS) $(DT_CFLAGS) $(OTHER_CFLAGS) \
+		$(LDFLAGS) $(DT_LDFLAGS) $(OTHER_LDFLAGS) \
+		-DTRACE_NAME="$(patsubst nano-trace-replay_%,%,$(notdir $@))" \
+		$(patsubst _Photos_puja,-DTEST_TIMEOUT=3000,$(findstring _Photos_puja,$(notdir $@))) \
+		-o $@ \
+		$(SRCROOT)/nano_trace_replay.c
+
+# For now, we only build and run MallocBench on iOS. macOS requires
+# us to adopt installAPI.
+LOWER_SDKROOT  = $(shell echo $(SDKROOT) | tr '[:upper:]' '[:lower:]')
+ifneq (, $(findstring iphoneos,$(LOWER_SDKROOT)))
+include MallocBenchTest/Makefile.malloc-bench
+BATS_PLISTS = $(BATS_PLISTS_EXTRACT) $(MALLOCBENCHTEST_DIR)/MallocBench.plist
+else
+include MallocBenchTest/Makefile.dummy
+BATS_PLISTS = $(BATS_PLISTS_EXTRACT)
+endif
+
+BATS_PLISTS += $(PROJECT_DIR)/tests/xctests/BATS.plist
+
+$(BATS_PLISTS_EXTRACT): %.plist : %
+	$(EXTRACTMETA) extract -i /$(INSTALLPATH)/$(notdir $<) -b $(SYMROOT)/$(notdir $<) -o $@
+	@plutil -convert binary1 $@
+
+SANITIZER_DYLIB_PATH := /usr/appleinternal/lib/sanitizers/
+asan: OTHER_CFLAGS += -fsanitize=address
+asan: OTHER_LDFLAGS += -Wl,-rpath -Wl,$(SANITIZER_DYLIB_PATH)
+
+ifeq ($(Embedded),NO)
+tsan: CFLAGS := $(filter-out $(ARCH_FLAGS),$(CFLAGS)) -arch x86_64 -fsanitize=thread
+tsan: OTHER_LDFLAGS += -Wl,-rpath -Wl,$(SANITIZER_DYLIB_PATH)
+else
+EXCLUDED_SOURCES += tsan.c
+endif
+
+madvise: OTHER_CFLAGS += -I../src
+
+xzone: OTHER_LDFLAGS += -ldarwintest_utils
+
+malloc_type: OTHER_CFLAGS += -ftyped-memory-operations
+
+ifneq ($(PLATFORM),WatchOS)
+# Modify the BATS plist to run general tests again with xzone malloc enabled
+add_xzone_tests: bats.plist
+	xcrun -sdk $(SDKROOT) python3 ./add_xzone_tests.py $(SYMROOT)/bats.plist
+
+CUSTOM_TARGETS += libmalloc_debug_symlink
+
+# Create a symlink to the debug version of the dylib that can be picked up in
+# isolation using DYLD_LIBRARY_PATH and DYLD_IMAGE_SUFFIX
+libmalloc_debug_symlink: ;
+
+install-libmalloc_debug_symlink:
+	mkdir -p $(INSTALLDIR)
+	ln -sf /usr/lib/system/libsystem_malloc_debug.dylib $(INSTALLDIR)/libsystem_malloc_testdebug.dylib
+
+.PHONY: add_xzone_tests
+
+# Ensure that we add the xzone tests before bats.plist is installed to the
+# dstroot
+install: add_xzone_tests
+endif # ($(PLATFORM),WatchOS)
+
+.DEFAULT_GOAL := all
+
+include $(DEVELOPER_DIR)/AppleInternal/Makefiles/darwintest/Makefile.targets