Added tests for version parsing errors

bumpversion/version_part.py

@@ -5,6 +5,8 @@
 from copy import copy
 from typing import Any, Dict, List, MutableMapping, Optional
 
+from click import UsageError
+
 from bumpversion.config import VersionPartConfig
 from bumpversion.exceptions import FormattingError, InvalidVersionPartError, MissingValueError
 from bumpversion.functions import NumericFunction, PartFunction, ValuesFunction
@@ -132,8 +134,7 @@ def __init__(
         try:
             self.parse_regex = re.compile(parse, re.VERBOSE)
         except re.error as e:
-            logger.error("--parse '%s' is not a valid regex. %s", parse, e)
-            raise e
+            raise UsageError(f"--parse '{parse}' is not a valid regex.") from e
 
         self.serialize_formats = serialize
         self.part_configs = part_configs or {}

tests/test_version_part.py

@@ -1,10 +1,13 @@
+from pathlib import Path
+
 import pytest
-from pytest import param
+from click import UsageError
+from pytest import LogCaptureFixture, param
 
 from bumpversion import config, exceptions
 from bumpversion.utils import get_context
 from bumpversion.version_part import VersionPart
-from tests.conftest import get_config_data
+from tests.conftest import get_config_data, inside_dir
 
 
 @pytest.fixture(
@@ -274,3 +277,24 @@ def test_part_first_value(initial: str, bump_type: str, expected: str):
 
     new_version = current_version.bump(bump_type, version_config.order)
     assert version_config.serialize(new_version, get_context(conf)) == expected
+
+
+def test_version_part_invalid_regex_exit(tmp_path: Path) -> None:
+    """A version part with an invalid regex should raise an exception."""
+    # Arrange
+    overrides = {
+        "current_version": "12",
+        "parse": "*kittens*",
+    }
+    with inside_dir(tmp_path):
+        with pytest.raises(UsageError):
+            get_config_data(overrides)
+
+
+def test_parse_doesnt_parse_current_version(tmp_path: Path, caplog: LogCaptureFixture) -> None:
+    """A warning should be output when the parse regex doesn't parse the version."""
+    overrides = {"current_version": "12", "parse": "xxx"}
+    with inside_dir(tmp_path):
+        get_config_data(overrides)
+
+    assert caplog.messages == ["Evaluating 'parse' option: 'xxx' does not parse current version '12'"]