move directory metadata test out of req install tests

tests/unit/metadata/test_metadata.py

@@ -129,3 +129,17 @@ def test_dist_found_in_zip(tmp_path: Path) -> None:
     dist = get_environment([location]).get_distribution("pkg")
     assert dist is not None and dist.location is not None
     assert Path(dist.location) == Path(location)
+
+
+@pytest.mark.parametrize(
+    "path",
+    (
+        "/path/to/foo.egg-info".replace("/", os.path.sep),
+        # Tests issue fixed by https://github.com/pypa/pip/pull/2530
+        "/path/to/foo.egg-info/".replace("/", os.path.sep),
+    ),
+)
+def test_trailing_slash_directory_metadata(path: str) -> None:
+    dist = get_directory_distribution(path)
+    assert dist.raw_name == dist.canonical_name == "foo"
+    assert dist.location == "/path/to".replace("/", os.path.sep)

tests/unit/test_req.py

@@ -23,7 +23,6 @@
     PreviousBuildDirError,
 )
 from pip._internal.index.package_finder import PackageFinder
-from pip._internal.metadata import select_backend
 from pip._internal.models.direct_url import ArchiveInfo, DirectUrl, DirInfo, VcsInfo
 from pip._internal.models.link import Link
 from pip._internal.network.session import PipSession
@@ -600,22 +599,6 @@ def test_url_preserved_editable_req(self) -> None:
         assert req.link is not None
         assert req.link.url == url
 
-    @pytest.mark.parametrize(
-        "path",
-        (
-            "/path/to/foo.egg-info".replace("/", os.path.sep),
-            # Tests issue fixed by https://github.com/pypa/pip/pull/2530
-            "/path/to/foo.egg-info/".replace("/", os.path.sep),
-        ),
-    )
-    def test_get_dist(self, path: str) -> None:
-        req = install_req_from_line("foo")
-        req.metadata_directory = path
-        dist = req.get_dist()
-        assert isinstance(dist, select_backend().Distribution)
-        assert dist.raw_name == dist.canonical_name == "foo"
-        assert dist.location == "/path/to".replace("/", os.path.sep)
-
     def test_markers(self) -> None:
         for line in (
             # recommended syntax