Fix stub-only partial namespace packages not recognized as packages

src/poetry/core/masonry/utils/package_include.py

@@ -51,8 +51,7 @@ def is_stub_only(self) -> bool:
         # returns `True` if this a PEP 561 stub-only package,
         # see [PEP 561](https://www.python.org/dev/peps/pep-0561/#stub-only-packages)
         return (self.package or "").endswith("-stubs") and all(
-            el.suffix == ".pyi"
-            or (el.parent.name == self.package and el.name == "py.typed")
+            el.suffix == ".pyi" or el.name == "py.typed"
             for el in self.elements
             if el.is_file()
         )

tests/masonry/builders/fixtures/pep_561_stub_only_partial_namespace/pkg-stubs/module.pyi

@@ -0,0 +1,4 @@
+"""Example module"""
+from typing import Tuple
+
+version_info = Tuple[int, int, int]

tests/masonry/builders/fixtures/pep_561_stub_only_partial_namespace/pkg-stubs/subpkg/py.typed

@@ -0,0 +1 @@
+partial

tests/masonry/builders/fixtures/pep_561_stub_only_partial_namespace/pyproject.toml

@@ -0,0 +1,14 @@
+[tool.poetry]
+name = "pep-561-stubs"
+version = "0.1"
+description = "PEP 561 stub namespace package example with the py.typed marker file"
+authors = [
+    "Henrik Bruåsdal <henrik.bruasdal@gmail.com>"
+]
+license = "MIT"
+packages = [
+    {include = "pkg-stubs"}
+]
+
+[tool.poetry.dependencies]
+python = "^3.6"

tests/masonry/builders/test_wheel.py

@@ -215,6 +215,20 @@ def test_wheel_package_pep_561_stub_only(package: str) -> None:
         assert "pkg-stubs/subpkg/__init__.pyi" in z.namelist()
 
 
+def test_wheel_package_pep_561_stub_only_partial_namespace() -> None:
+    root = fixtures_dir / "pep_561_stub_only_partial_namespace"
+    WheelBuilder.make(Factory().create_poetry(root))
+
+    whl = root / "dist" / "pep_561_stubs-0.1-py3-none-any.whl"
+
+    assert whl.exists()
+
+    with zipfile.ZipFile(str(whl)) as z:
+        assert "pkg-stubs/module.pyi" in z.namelist()
+        assert "pkg-stubs/subpkg/__init__.pyi" in z.namelist()
+        assert "pkg-stubs/subpkg/py.typed" in z.namelist()
+
+
 def test_wheel_package_pep_561_stub_only_includes_typed_marker() -> None:
     root = fixtures_dir / "pep_561_stub_only_partial"
     WheelBuilder.make(Factory().create_poetry(root))

tests/masonry/utils/fixtures/pep_561_stub_only_partial_namespace/good-stubs/module.pyi

@@ -0,0 +1,4 @@
+"""Example module"""
+from typing import Tuple
+
+version_info = Tuple[int, int, int]

tests/masonry/utils/fixtures/pep_561_stub_only_partial_namespace/good-stubs/subpkg/py.typed

@@ -0,0 +1 @@
+partial

tests/masonry/utils/test_package_include.py

@@ -65,6 +65,19 @@ def test_pep_561_stub_only_package_good_name_suffix() -> None:
     ]
 
 
+def test_pep_561_stub_only_partial_namespace_package_good_name_suffix() -> None:
+    pkg_include = PackageInclude(
+        base=fixtures_dir / "pep_561_stub_only_partial_namespace", include="good-stubs"
+    )
+    assert pkg_include.elements == [
+        fixtures_dir / "pep_561_stub_only_partial_namespace/good-stubs/module.pyi",
+        fixtures_dir / "pep_561_stub_only_partial_namespace/good-stubs/subpkg/",
+        fixtures_dir
+        / "pep_561_stub_only_partial_namespace/good-stubs/subpkg/__init__.pyi",
+        fixtures_dir / "pep_561_stub_only_partial_namespace/good-stubs/subpkg/py.typed",
+    ]
+
+
 def test_pep_561_stub_only_package_bad_name_suffix() -> None:
     with pytest.raises(ValueError) as e:
         PackageInclude(base=fixtures_dir / "pep_561_stub_only", include="bad")