[functional expected output] Makes auto-update works even if the curr…

…ent output is wrong

Previously if an exception was raised during parsing we re-raised an explanation.
Most of the time I just want to regenerate the output from the current pylint's
output. It's what the exception suggested but it's impossible to do as the error
is also raised when updating, so you had to empty the file.

pylint/testutils/output_line.py

@@ -33,44 +33,6 @@ class MessageTest(NamedTuple):
     """
 
 
-class MalformedOutputLineException(Exception):
-    def __init__(
-        self,
-        row: Sequence[str] | str,
-        exception: Exception,
-    ) -> None:
-        example = "msg-symbolic-name:42:27:MyClass.my_function:The message"
-        other_example = "msg-symbolic-name:7:42::The message"
-        expected = [
-            "symbol",
-            "line",
-            "column",
-            "end_line",
-            "end_column",
-            "MyClass.myFunction, (or '')",
-            "Message",
-            "confidence",
-        ]
-        reconstructed_row = ""
-        i = 0
-        try:
-            for i, column in enumerate(row):
-                reconstructed_row += f"\t{expected[i]}='{column}' ?\n"
-            for missing in expected[i + 1 :]:
-                reconstructed_row += f"\t{missing}= Nothing provided !\n"
-        except IndexError:
-            pass
-        raw = ":".join(row)
-        msg = f"""\
-{exception}
-
-Expected '{example}' or '{other_example}' but we got '{raw}':
-{reconstructed_row}
-
-Try updating it with: 'python tests/test_functional.py {UPDATE_OPTION}'"""
-        super().__init__(msg)
-
-
 class OutputLine(NamedTuple):
     symbol: str
     lineno: int
@@ -127,6 +89,7 @@ def from_csv(
         """
         if isinstance(row, str):
             row = row.split(",")
+        # noinspection PyBroadException
         try:
             column = cls._get_column(row[2])
             if len(row) == 5:
@@ -170,8 +133,14 @@ def from_csv(
                     row[7],
                 )
             raise IndexError
-        except Exception as e:
-            raise MalformedOutputLineException(row, e) from e
+        except Exception:  # pylint: disable=broad-except
+            warnings.warn(
+                "Expected 'msg-symbolic-name:42:27:MyClass.my_function:The message:"
+                f"CONFIDENCE' but we got '{':'.join(row)}'. Try updating the expected"
+                f" output with:\npython tests/test_functional.py {UPDATE_OPTION}",
+                UserWarning,
+            )
+            return cls("", 0, 0, None, None, "", "", "")
 
     def to_csv(self) -> tuple[str, str, str, str, str, str, str, str]:
         """Convert an OutputLine to a tuple of string to be written by a

tests/testutils/test_output_line.py

@@ -13,7 +13,7 @@
 from pylint.constants import PY38_PLUS
 from pylint.interfaces import HIGH, INFERENCE, Confidence
 from pylint.message import Message
-from pylint.testutils.output_line import MalformedOutputLineException, OutputLine
+from pylint.testutils.output_line import OutputLine
 from pylint.typing import MessageLocationTuple
 
 
@@ -127,20 +127,20 @@ def test_output_line_to_csv(confidence: Confidence, message: Callable) -> None:
 def test_output_line_from_csv_error() -> None:
     """Test that errors are correctly raised for incorrect OutputLine's."""
     # Test a csv-string which does not have a number for line and column
-    with pytest.raises(
-        MalformedOutputLineException,
+    with pytest.warns(
+        UserWarning,
         match="msg-symbolic-name:42:27:MyClass.my_function:The message",
     ):
         OutputLine.from_csv("'missing-docstring', 'line', 'column', 'obj', 'msg'", True)
     # Test a tuple which does not have a number for line and column
-    with pytest.raises(
-        MalformedOutputLineException, match="symbol='missing-docstring' ?"
+    with pytest.warns(
+        UserWarning, match="we got 'missing-docstring:line:column:obj:msg'"
     ):
         csv = ("missing-docstring", "line", "column", "obj", "msg")
         OutputLine.from_csv(csv, True)
     # Test a csv-string that is too long
-    with pytest.raises(
-        MalformedOutputLineException,
+    with pytest.warns(
+        UserWarning,
         match="msg-symbolic-name:42:27:MyClass.my_function:The message",
     ):
         OutputLine.from_csv(