Fix tests and better error message

src/servestatic/middleware.py

@@ -184,9 +184,9 @@ async def __call__(self, request):
                 for finder in current_finders
                 for storage in finder.storages.values()
             ]
-            app_dirs = "\n    ".join(sorted(app_dirs))
+            app_dirs = "\n• ".join(sorted(app_dirs))
             raise MissingFileError(
-                f"{request.path} not found. Searched these paths:{app_dirs}"
+                f"ServeStatic did not find the file '{request.path.lstrip(settings.STATIC_URL)}' within the following paths:\n• {app_dirs}"
             )
 
         return await self.get_response(request)

tests/test_django_whitenoise.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import asyncio
+import html
 import shutil
 import tempfile
 from contextlib import closing
@@ -248,12 +249,16 @@ def test_404_in_prod(server):
 
 @override_settings(DEBUG=True)
 def test_error_message(server):
-    response = server.get(settings.STATIC_URL + "garbage")
-    print(response.content.decode())
-    app_dirs = Path(__file__).parent / "test_files" / "static"
-
-    expected = f"""{settings.STATIC_URL + 'garbage'} not found. Searched these paths:
+    response = server.get(f"{settings.STATIC_URL}garbage")
+    response_content = str(response.content.decode())
+    response_content = html.unescape(response_content)
 
-    {app_dirs}"""
+    # Beautify for easier debugging
+    response_content = response_content[response_content.index("ServeStatic") :]
 
-    assert expected in str(response.content.decode())
+    assert (
+        "ServeStatic did not find the file 'garbage' within the following paths:"
+        in response_content
+    )
+    assert "•" in response_content
+    assert str(Path(__file__).parent / "test_files" / "static") in response_content