new test

tests/lib/test_archive.py

@@ -89,6 +89,22 @@ def tar4(tmp_path: pathlib.Path) -> pathlib.Path:
     return tar
 
 
+@pytest.fixture
+def tar5(tmp_path: pathlib.Path) -> pathlib.Path:
+    a = tmp_path.joinpath("a")
+    a.write_text("")
+    b = tmp_path.joinpath("b")
+    b.write_text("")
+
+    tar = tmp_path.joinpath("tar")
+
+    with tarfile.open(tar, "w:tar") as tarf:
+        tarf.add(a, arcname="foo/v1/bar")
+        tarf.add(b, arcname="foo/v2/baz")
+
+    return tar
+
+
 @pytest.fixture
 def mock_sleep() -> typing.Generator[mock.MagicMock, None, None]:
     with mock.patch.object(time, "sleep", autospec=True) as mock_sleep:
@@ -234,3 +250,19 @@ def test_unpack_strip_n_root(
     archive.unpack_strip_n(str(tar4), str(dest2), n=0)
     # n=0 can be used to just strip the root component
     assert os.path.exists(f"{tmp_path}/dest/foo/bar")
+
+
+def test_unpack_strip_n_unexpected_structure_inconsistent_components(
+    tar5: pathlib.Path, tmp_path: pathlib.Path
+) -> None:
+    dest = tmp_path.joinpath("dest")
+    with pytest.raises(ValueError) as excinfo:
+        archive.unpack_strip_n(str(tar5), str(dest), n=2)
+
+    assert (
+        f"{excinfo.value}"
+        == """unexpected archive structure:
+
+foo/v2/baz doesn't have the prefix to be removed (foo/v1/)
+"""
+    )