test(classifier): ✅ add tests that assert that fixtures must exist with their associated existing pattern

a log line cannot match multiple patterns. Again a fixture can only exist in codebase if its associated pattern also exists.

pyproject.toml

@@ -4,7 +4,9 @@ version = "0.1.0"
 description = "Trier, classifier et extraire automatiquement les entrées pertinentes d'un fichier de logs applicatif."
 readme = "README.md"
 requires-python = ">=3.10"
-dependencies = []
+dependencies = [
+    "pytest-cov>=7.1.0",
+]
 
 [dependency-groups]
 dev = [