Add reported failing spec

tests/unit/test_utils.py

@@ -136,6 +136,10 @@ def test_open_guess_encoding():
         ("-r requirements.txt", True),
         ("-e .", True),
         ("--editable=.", True),
+        (
+            "--editable=git+https://github.com/popgensims/stdpopsim.git#egg=stdpopsim-master",
+            False,
+        ),
         ("file://subdir", True),
         ("file://./subdir", True),
         ("git://github.com/jupyter/repo2docker", False),