Test packaged import path.

test_nvbench_tooling_deps.py now has a smoke test that builds a
temporary package layout matching the wheel mapping:

cuda/bench/scripts/nvbench_tooling_deps.py

and imports:

cuda.bench.scripts.nvbench_tooling_deps

That covers the cuda.bench.scripts.* path without requiring a wheel
build/install inside this unit test.

python/test/test_nvbench_tooling_deps.py

@@ -2,6 +2,7 @@
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
 import importlib
+import shutil
 import sys
 from pathlib import Path
 
@@ -16,6 +17,25 @@ def tooling_deps(monkeypatch):
     return importlib.import_module("nvbench_tooling_deps")
 
 
+def test_tooling_deps_imports_from_packaged_script_path(tmp_path, monkeypatch):
+    scripts_dir = Path(__file__).resolve().parents[1] / "scripts"
+    package_dir = tmp_path / "cuda" / "bench" / "scripts"
+    package_dir.mkdir(parents=True)
+    for package in [tmp_path / "cuda", tmp_path / "cuda" / "bench", package_dir]:
+        (package / "__init__.py").write_text("", encoding="utf-8")
+    shutil.copy(
+        scripts_dir / "nvbench_tooling_deps.py",
+        package_dir / "nvbench_tooling_deps.py",
+    )
+
+    monkeypatch.syspath_prepend(str(tmp_path))
+    sys.modules.pop("cuda.bench.scripts.nvbench_tooling_deps", None)
+
+    module = importlib.import_module("cuda.bench.scripts.nvbench_tooling_deps")
+
+    assert module.ToolingDependency("math", "math", "testing").extra == "tools"
+
+
 def test_require_tooling_dependency_returns_loaded_module(tooling_deps):
     module = tooling_deps.require_tooling_dependency(
         tooling_deps.ToolingDependency("math", "math", "testing"),