Updated to comply with docker-compose support for environment settings

Updated test to look for more specific error
[OSF-6670]

Author: TomBaxter

mfr/extensions/codepygments/settings.py

@@ -1,9 +1,5 @@
-try:
-    from mfr import settings
-except ImportError:
-    settings = {}
-
-config = settings.get('CODEPYGMENTS_EXTENSION_CONFIG', {})
+from mfr import settings
 
+config = settings.child('CODEPYGMENTS_EXTENSION_CONFIG')
 
 MAX_SIZE = config.get('MAX_SIZE', 65536)

tests/extensions/codepygments/test_renderer.py

@@ -6,6 +6,7 @@
 from mfr.core.provider import ProviderMetadata
 
 from mfr.extensions.codepygments import CodePygmentsRenderer
+from mfr.extensions.codepygments.exceptions import FileToLargeException
 from mfr.extensions.codepygments import settings
 
 
@@ -92,7 +93,7 @@ def test_render_codepygments_max_size(self, metadata, max_size_file_path, url, a
             os.remove(max_size_file_path)
 
     def test_render_codepygments_over_size(self, metadata, over_size_file_path, url, assets_url, export_url):
-        with pytest.raises(RendererError):
+        with pytest.raises(FileToLargeException):
             try:
                 renderer = CodePygmentsRenderer(metadata, over_size_file_path,
                                                 url, assets_url, export_url)