1 files changed, 31 insertions, 9 deletions
diff --git a/tests/unit/test_packaging.py b/tests/unit/test_packaging.py
index 448e38063..88277448c 100644
--- a/tests/unit/test_packaging.py
+++ b/tests/unit/test_packaging.py
@@ -1,22 +1,44 @@
+from typing import Optional, Tuple
+
 import pytest
 from pip._vendor.packaging import specifiers
+from pip._vendor.packaging.requirements import Requirement
 
-from pip._internal.utils.packaging import check_requires_python
+from pip._internal.utils.packaging import check_requires_python, get_requirement
 
 
-@pytest.mark.parametrize('version_info, requires_python, expected', [
-    ((3, 6, 5), '== 3.6.4', False),
-    ((3, 6, 5), '== 3.6.5', True),
-    ((3, 6, 5), None, True),
-])
-def test_check_requires_python(version_info, requires_python, expected):
+@pytest.mark.parametrize(
+    "version_info, requires_python, expected",
+    [
+        ((3, 6, 5), "== 3.6.4", False),
+        ((3, 6, 5), "== 3.6.5", True),
+        ((3, 6, 5), None, True),
+    ],
+)
+def test_check_requires_python(
+    version_info: Tuple[int, int, int], requires_python: Optional[str], expected: bool
+) -> None:
     actual = check_requires_python(requires_python, version_info)
     assert actual == expected
 
 
-def test_check_requires_python__invalid():
+def test_check_requires_python__invalid() -> None:
     """
     Test an invalid Requires-Python value.
     """
     with pytest.raises(specifiers.InvalidSpecifier):
-        check_requires_python('invalid', (3, 6, 5))
+        check_requires_python("invalid", (3, 6, 5))
+
+
+def test_get_or_create_caching() -> None:
+    """test caching of get_or_create requirement"""
+    teststr = "affinegap==1.10"
+    from_helper = get_requirement(teststr)
+    freshly_made = Requirement(teststr)
+
+    # Requirement doesn't have an equality operator (yet) so test
+    # equality of attribute for list of attributes
+    for iattr in ["name", "url", "extras", "specifier", "marker"]:
+        assert getattr(from_helper, iattr) == getattr(freshly_made, iattr)
+    assert get_requirement(teststr) is not Requirement(teststr)
+    assert get_requirement(teststr) is get_requirement(teststr)