Move all classifier validation code into a helper.

src/poetry/console/commands/check.py

@@ -2,9 +2,6 @@
 
 from pathlib import Path
 
-from trove_classifiers import classifiers
-from trove_classifiers import deprecated_classifiers
-
 from poetry.console.commands.command import Command
 
 
@@ -13,25 +10,20 @@ class CheckCommand(Command):
     name = "check"
     description = "Checks the validity of the <comment>pyproject.toml</comment> file."
 
-    def handle(self) -> int:
-        from poetry.core.pyproject.toml import PyProjectTOML
+    def validate_classifiers(
+        self, project_classifiers: set[str]
+    ) -> tuple[list[str], list[str]]:
+        from trove_classifiers import classifiers
+        from trove_classifiers import deprecated_classifiers
 
-        from poetry.factory import Factory
-
-        # Load poetry config and display errors, if any
-        poetry_file = Factory.locate(Path.cwd())
-        config = PyProjectTOML(poetry_file).poetry_config
-        check_result = Factory.validate(config, strict=True)
-
-        project_classifiers = set(config.get("classifiers", []))
+        errors = []
+        warnings = []
 
         unrecognized = sorted(
             project_classifiers - set(classifiers) - set(deprecated_classifiers)
         )
         if unrecognized:
-            check_result["errors"].append(
-                f"Unrecognized classifiers: {unrecognized!r}."
-            )
+            errors.append(f"Unrecognized classifiers: {unrecognized!r}.")
 
         deprecated = sorted(
             project_classifiers.intersection(set(deprecated_classifiers))
@@ -46,10 +38,27 @@ def handle(self) -> int:
                     )
                 else:
                     message = (
-                        f"Deprecated classifier {old_classifier!r}. "
-                        "Must be removed."
+                        f"Deprecated classifier {old_classifier!r}. Must be removed."
                     )
-                check_result["warnings"].append(message)
+                warnings.append(message)
+
+        return errors, warnings
+
+    def handle(self) -> int:
+        from poetry.core.pyproject.toml import PyProjectTOML
+
+        from poetry.factory import Factory
+
+        # Load poetry config and display errors, if any
+        poetry_file = Factory.locate(Path.cwd())
+        config = PyProjectTOML(poetry_file).poetry_config
+        check_result = Factory.validate(config, strict=True)
+
+        # Validate trove classifiers
+        project_classifiers = set(config.get("classifiers", []))
+        errors, warnings = self.validate_classifiers(project_classifiers)
+        check_result["errors"].extend(errors)
+        check_result["warnings"].extend(warnings)
 
         if not check_result["errors"] and not check_result["warnings"]:
             self.info("All set!")