diff --git a/tests/test_wrapper.py b/tests/test_wrapper.py
new file mode 100644
index 00000000..18849180
--- /dev/null
+++ b/tests/test_wrapper.py
@@ -0,0 +1,146 @@
+# tests/test_triton_sanitizer_trace_injection.py
+import json
+import os
+import sys
+import textwrap
+import subprocess
+from pathlib import Path
+import shutil
+
+
+def test_triton_sanitizer_injects_trace_outermost(tmp_path: Path, monkeypatch):
+    """
+    Black-box verification:
+    - Pure @triton.jit kernels have exactly one @triton_viz.trace at the outermost layer;
+    - @triton.autotune + @triton.jit kernels: trace is only added at the autotune outer layer, inner jit should not be traced again.
+    Implementation approach:
+      Use sitecustomize to monkey-patch triton_viz.trace at subprocess startup,
+      record each trace decorator application target (function name/type), write to JSON on exit.
+    """
+
+    # 1) Write sitecustomize: takes effect at interpreter startup
+    trace_log = tmp_path / "trace_log.json"
+    sitecustomize = tmp_path / "sitecustomize.py"
+    sitecustomize.write_text(
+        textwrap.dedent(
+            f"""
+            import atexit, json, os
+            # Import and replace triton_viz.trace here
+            import triton_viz as _tv
+
+            _orig_trace = _tv.trace
+            _records = []
+
+            def _spy_trace(*t_args, **t_kwargs):
+                # Call original trace, get the actual decorator
+                _decorator = _orig_trace(*t_args, **t_kwargs)
+                def _apply(target):
+                    # Which object is being applied to (usually function name, or autotune/jit product)
+                    name = getattr(target, "__name__", None) or getattr(target, "__qualname__", None) or repr(target)
+                    typ  = type(target).__name__
+                    mod  = getattr(target, "__module__", None)
+
+                    _records.append({{
+                        "name": name,
+                        "type": typ,
+                        "module": mod,
+                    }})
+
+                    # Continue with original logic, keep functionality unchanged
+                    return _decorator(target)
+                return _apply
+
+            # Replace
+            _tv.trace = _spy_trace
+
+            # Write records to disk on process exit
+            _LOG_PATH = {json.dumps(str(trace_log))}
+            @atexit.register
+            def _dump_records():
+                try:
+                    with open(_LOG_PATH, "w") as f:
+                        json.dump(_records, f)
+                except Exception as e:
+                    # Avoid affecting test process exit
+                    pass
+            """
+        ),
+        encoding="utf-8",
+    )
+
+    # 2) Write a minimal test script: two kernels
+    #    - k1: pure jit
+    #    - k2: autotune + jit
+    my_program = tmp_path / "my_program.py"
+    my_program.write_text(
+        textwrap.dedent(
+            """
+            import triton
+            import triton.language as tl
+
+            # --- Pure jit ---
+            @triton.jit
+            def k1(X, n: tl.constexpr):
+                return
+
+            # --- autotune + jit ---
+            @triton.autotune(configs=[triton.Config({})], key=['n'])
+            @triton.jit
+            def k2(X, n: tl.constexpr):
+                return
+
+            if __name__ == "__main__":
+                # No need to actually launch kernel; we just need the decorator chain to be built
+                pass
+            """
+        ),
+        encoding="utf-8",
+    )
+
+    # 3) Assemble subprocess environment: ensure our sitecustomize is found first
+    env = os.environ.copy()
+    # Put tmp_path at the front, ensure sitecustomize.py is auto-imported
+    env["PYTHONPATH"] = str(tmp_path) + os.pathsep + env.get("PYTHONPATH", "")
+
+    # 4) Find triton-sanitizer executable (also allow python -m entry as fallback)
+    exe = shutil.which("triton-sanitizer")
+    if exe:
+        cmd = [exe, str(my_program)]
+    else:
+        # If your entry point name is different, use the corresponding module (below is the wrapper.apply path)
+        cmd = [sys.executable, "-m", "triton_viz.wrapper", str(my_program)]
+
+    # 5) Run subprocess
+    proc = subprocess.run(
+        cmd,
+        cwd=str(tmp_path),
+        env=env,
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        text=True,
+    )
+
+    # Optional debug output (easier to locate on failure)
+    if proc.returncode != 0:
+        print("STDOUT:\n", proc.stdout)
+        print("STDERR:\n", proc.stderr)
+    assert proc.returncode == 0, "triton-sanitizer run failed"
+
+    # 6) Read trace records
+    assert (
+        trace_log.exists()
+    ), "trace log not generated (sitecustomize may not have taken effect)"
+    records = json.loads(trace_log.read_text(encoding="utf-8"))
+
+    # Build counter by function name
+    from collections import Counter
+
+    counts = Counter(rec["name"] for rec in records)
+
+    # Assertion: the 2 kernel names defined in our script should each appear exactly once
+    # - k1: pure jit → should have trace injected once at outer layer
+    # - k2: autotune + jit → should only appear once at autotune outer layer (should not trace inner jit again)
+    for expected in ["k1", "k2"]:
+        assert (
+            counts[expected] == 1
+        ), f"{expected} should be traced 1 time, actual count is {counts[expected]}; may have missing or duplicate injection"
diff --git a/triton_viz/wrapper.py b/triton_viz/wrapper.py
index 8d549f8c..3e1472bb 100644
--- a/triton_viz/wrapper.py
+++ b/triton_viz/wrapper.py
@@ -1,5 +1,8 @@
+import os
+import shutil
 import runpy
 import sys
+import pytest
 import triton
 import triton_viz
 from triton_viz.clients import Sanitizer
@@ -7,6 +10,7 @@
 
 # store the original triton.jit
 _original_jit = triton.jit
+_original_autotune = triton.autotune
 
 
 def sanitizer_wrapper(kernel):
@@ -28,6 +32,19 @@ def _decorator(f):
         return sanitizer_wrapper(k)
 
 
+def _patched_autotune(fn=None, **autotune_kw):
+    if fn is None:
+
+        def _decorator(f):
+            k = _original_autotune(**autotune_kw)(f)
+            return sanitizer_wrapper(k)
+
+        return _decorator
+    else:
+        k = _original_autotune(fn)
+        return sanitizer_wrapper(k)
+
+
 def apply():
     """
     Apply the sanitizer wrapper to triton.jit and run the user script.
@@ -39,6 +56,9 @@ def apply():
 
     _interp.jit = _patched_jit
 
+    # patching triton.autotune
+    triton.autotune = _patched_autotune
+
     # run user script
     # argv is like: ['triton-sanitizer', 'user_script.py', 'arg1', 'arg2', ...]
     if len(sys.argv) < 2:
@@ -47,11 +67,6 @@ def apply():
 
     script = sys.argv[1]
 
-    # Check if the first argument is a file that exists
-    import os
-    import subprocess
-    import shutil
-
     if os.path.isfile(script):
         # It's a Python script file, run it directly
         sys.argv = sys.argv[1:]
@@ -62,12 +77,17 @@ def apply():
 
         # Check if it's an executable command
         if shutil.which(cmd[0]):
-            # Run the command with the sanitizer environment already set up
-            result = subprocess.run(cmd, env=os.environ.copy())
-            sys.exit(result.returncode)
-        else:
-            print(f"Error: '{script}' is neither a valid file nor a command")
-            sys.exit(1)
+            if cmd[0] == "pytest":
+                sys.exit(pytest.main(cmd[1:]))
+            elif cmd[0] == "python":
+                sys.argv = cmd[1:]
+                try:
+                    runpy.run_path(cmd[1], run_name="__main__")
+                except SystemExit as e:
+                    sys.exit(e.code)
+                sys.exit(0)
+        print(f"Error: '{script}' is neither a valid file nor a command")
+        sys.exit(1)
 
 
 def enable_sanitizer():