feat(testing.pytest): add pkg mock fixture

src/byteb4rb1e/utils/testing/pytest/fixtures.py

@@ -1,6 +1,7 @@
 import os
 from pathlib import Path
-from typing import Tuple
+import sys
+from typing import Dict, Tuple, Union
 
 import pytest
 
@@ -12,3 +13,28 @@ def current_test() -> Tuple[Path, str]:
     """
     """
     return get_current_test()
+
+
+@pytest.fixture
+def mock_pkg(tmp_path):
+    def _create(name: str, files: Dict[str, Union[str, bytes]]):
+        pkg_path = tmp_path / name.replace('.', os.path.sep)
+        pkg_path.mkdir(parents=True)
+        (pkg_path / "__init__.py").touch()
+
+        for fname, content in files.items():
+            fpath = (pkg_path / fname)
+            fpath.parent.mkdir(parents=True, exist_ok=True)
+            if isinstance(content, str):
+                fpath.write_text(content)
+            else:
+                fpath.write_bytes(content)
+
+        sys.path.insert(0, str(tmp_path))
+        return name, pkg_path
+
+    yield _create
+
+    # cleanup sys.path after test
+    if str(tmp_path) in sys.path:
+        sys.path.remove(str(tmp_path))