--- /dev/null
+++ libmalloc/libmalloc-317.100.9/tests/nano_trace_replay.c
@@ -0,0 +1,112 @@
+//
+//  nanov2_tests.c
+//  libmalloc
+//
+//  Tests that are specific to the implementation details of Nanov2.
+//
+#include <TargetConditionals.h>
+#include <darwintest.h>
+#include <darwintest_utils.h>
+#include <spawn.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/wait.h>
+#include <malloc/malloc.h>
+#include <../src/internal.h>
+
+#if CONFIG_NANOZONE && !TARGET_OS_BRIDGE
+
+static void
+run_replay_tool(char *replay_file, const char *out_dir, char *test_name, char **envp) {
+	int rc;
+	char *replay_tool = "/usr/local/bin/libmalloc_replay";
+
+	char replay_arg[256];
+	rc = snprintf(replay_arg, 256, "%s", replay_file);
+
+	char output_arg[256];
+	rc |= snprintf(output_arg, 256, "%s/libmalloc.replay.%s", out_dir, test_name);
+
+	char *args[] = {replay_tool, "-r", replay_arg, "-j", output_arg,
+			"-t", test_name, "-s", NULL};
+
+	T_QUIET; T_ASSERT_POSIX_SUCCESS(rc, "Failed to generate libmalloc_replay command");
+
+	pid_t pid;
+	rc = posix_spawn(&pid, replay_tool, NULL, NULL, args, envp);
+	T_QUIET; T_ASSERT_POSIX_SUCCESS(rc, "posix_spawn failed: %d", rc);
+
+	int exit_status = 0;
+	rc = waitpid(pid, &exit_status, 0);
+	if (rc == -1 || !WIFEXITED(exit_status) || WEXITSTATUS(exit_status)) {
+		T_ASSERT_FAIL("Replay tool exited abnormally: %d", WEXITSTATUS(exit_status));
+	}
+}
+
+static void
+run_nano_replay(char *replay_file_path, char *test_name, char *version)
+{
+	T_QUIET; T_ASSERT_POSIX_SUCCESS(access(replay_file_path, F_OK),
+			"Test cannot access replay file: %s", replay_file_path);
+
+	const char *tmp_dir = dt_tmpdir();
+	T_QUIET; T_ASSERT_NOTNULL(tmp_dir, "Couldn't fetch dt_tmpdir");
+
+	char full_test_name[256];
+	char env_var[32];
+
+	int rc = snprintf(full_test_name, sizeof(full_test_name), "%s_%s", test_name, version);
+	T_QUIET; T_ASSERT_POSIX_SUCCESS(rc, "Failed to generate full test name");
+	rc = snprintf(env_var, sizeof(env_var), "MallocNanoZone=%s", version);
+	T_QUIET; T_ASSERT_POSIX_SUCCESS(rc, "Failed to generate env vars");
+
+	char *envp[] = {env_var, NULL};
+	run_replay_tool(replay_file_path, tmp_dir, full_test_name, envp);
+}
+
+#ifndef TEST_TIMEOUT
+#define TEST_TIMEOUT 1200
+#endif
+
+#define NANO_FRAG_TEST_VERSION(trace_name, nano_version, timeout) \
+	T_DECL(nano_frag_## trace_name ## _ ## nano_version, "track Nano"#nano_version" fragmentation in "#trace_name, \
+	T_META_TAG_PERF, T_META_NAMESPACE("libmalloc"), \
+	T_META_GIT_ASSET_URL("ssh://git@stash.sd.apple.com/coreos/libmalloc.git"), \
+	T_META_TIMEOUT(timeout), \
+	T_META_GIT_ASSET("../traces/"#trace_name".mtrace")) \
+		{ \
+			const char *dt_assets = getenv("DT_ASSETS"); \
+			T_QUIET; T_ASSERT_NOTNULL(dt_assets, "$DT_ASSETS not set"); \
+			char *replay_file = NULL; \
+			asprintf(&replay_file, "%s/%s", dt_assets, "../traces/"#trace_name".mtrace"); \
+			run_nano_replay(replay_file, #trace_name, #nano_version); \
+			T_PASS("Successfully ran libmalloc_replay under Nano"#nano_version); \
+			free(replay_file); \
+		}
+
+#elif CONFIG_NANOZONE && TARGET_OS_BRIDGE
+
+#define NANO_FRAG_TEST_VERSION(trace_name, nano_version, timeout) \
+	T_DECL(nano_frag_## trace_name ## _ ## nano_version, "track Nano"#nano_version" fragmentation in "#trace_name, \
+	T_META_NAMESPACE("libmalloc")) \
+		{ \
+			T_SKIP("skipping trace replay on BridgeOS"); \
+		}
+
+#else // !CONFIG_NANOZONE && !TARGET_OS_BRIDGE
+
+#define NANO_FRAG_TEST_VERSION(trace_name, nano_version, timeout) \
+	T_DECL(nano_frag_## trace_name ## _ ## nano_version, "track Nano"#nano_version" fragmentation in "#trace_name, \
+	T_META_NAMESPACE("libmalloc")) \
+		{ \
+			T_SKIP("nanozone configured off; trace replay skipped"); \
+		}
+
+#endif // !CONFIG_NANOZONE && !TARGET_OS_BRIDGE
+
+#define NANO_FRAG_TEST(trace_name) \
+	NANO_FRAG_TEST_VERSION(trace_name, V1, TEST_TIMEOUT) \
+	NANO_FRAG_TEST_VERSION(trace_name, V2, TEST_TIMEOUT)
+
+NANO_FRAG_TEST(TRACE_NAME)
+