Merge pull request linkml#320 from sneakers-the-rat/fix-linkml-files-uris

Correct `linkml_files.URL_FOR` - add URL resolutiontests

Author: cmungall

.github/workflows/main.yaml

@@ -50,7 +50,7 @@ jobs:
       #----------------------------------------------
       - name: Generate coverage results
         run: |
-          poetry run coverage run -m unittest discover
+          poetry run coverage run -m pytest
           poetry run coverage xml
           poetry run coverage report -m
 

linkml_runtime/linkml_model/linkml_files.py

@@ -143,7 +143,8 @@ def _build_loc(base: str, source: Source, fmt: Format) -> str:
 
 def URL_FOR(source: Source, fmt: Format) -> str:
     """ Return the URL to retrieve source in format """
-    return f"{LINKML_URL_BASE}{source.value}.{fmt.value}"
+    fmt_path: FormatPath = _Path.get(fmt.name)
+    return f"{LINKML_URL_BASE}{source.value}.{fmt_path.extension}"
 
 
 def LOCAL_PATH_FOR(source: Source, fmt: Format) -> str: