refactor(tests): remove redundant filename field

file: serve sia come path da leggere che come nome passato a detect_content_type.
Non c'è motivo di averli separati.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/fixtures/preprocessors/cases.yaml

@@ -4,7 +4,6 @@
 # process: <content_type>   → chiama preprocess(content_type, content)
 #
 # Sorgente: file: <nome in data/>  oppure  generate: binary_noise
-# filename: override del nome file passato a detect (default: valore di file:)
 #
 # Assertions piatte (solo per process):
 #   no_html: true           clean_text senza tag HTML
@@ -17,12 +16,10 @@
 
 - id: "1.1"
   file: email_action.html
-  filename: email_export.html
   detect: email_html
 
 - id: "1.2"
   file: generic_page.html
-  filename: index.html
   detect: generic_html
 
 - id: "1.3"
@@ -30,8 +27,8 @@
   detect: plain_text
 
 - id: "1.4"
+  file: archive.xyz
   generate: binary_noise
-  filename: archive.xyz
   detect: unknown
 
 - id: "1.5"

tests/test_preprocessors.py

@@ -68,7 +68,7 @@ def test_detect(preprocess_case, pytestconfig) -> None:
     case = preprocess_case
     data_dir = _fixtures_dir(pytestconfig) / "data"
     raw = _content(case, data_dir)
-    filename = case.get("filename", case.get("file", ""))
+    filename = case.get("file", "")
     ct = detect_content_type(filename, raw)
     expected = case["detect"]
     _lf_score(f"preprocess.detect.{case['id']}", 1.0 if ct == expected else 0.0)