In tests, always use alpharep fixture.

tests/test_path.py

@@ -216,11 +216,12 @@ def test_open_write(self):
         with zf.joinpath('file.txt').open('w', encoding="utf-8") as strm:
             strm.write('text file')
 
-    def test_open_extant_directory(self):
+    @pass_alpharep
+    def test_open_extant_directory(self, alpharep):
         """
         Attempting to open a directory raises IsADirectoryError.
         """
-        zf = zipp.Path(add_dirs(build_alpharep_fixture()))
+        zf = zipp.Path(alpharep)
         with self.assertRaises(IsADirectoryError):
             zf.joinpath('b').open()
 
@@ -232,11 +233,12 @@ def test_open_binary_invalid_args(self, alpharep):
         with self.assertRaises(ValueError):
             root.joinpath('a.txt').open('rb', 'utf-8')
 
-    def test_open_missing_directory(self):
+    @pass_alpharep
+    def test_open_missing_directory(self, alpharep):
         """
         Attempting to open a missing directory raises FileNotFoundError.
         """
-        zf = zipp.Path(add_dirs(build_alpharep_fixture()))
+        zf = zipp.Path(alpharep)
         with self.assertRaises(FileNotFoundError):
             zf.joinpath('z').open()