Fixes Key Error exception when searching

bumpversion/files.py

@@ -180,6 +180,9 @@ def make_file_change(
             logger.indent()
             context["new_version"] = self.version_config.serialize(new_version, context)
             logger.dedent()
+        else:
+            logger.debug("No new version, using current version as new version")
+            context["new_version"] = context["current_version"]
 
         search_for, raw_search_pattern = self.file_change.get_search_pattern(context)
         replace_with = self.version_config.replace.format(**context)

tests/test_cli.py

@@ -560,6 +560,40 @@ def test_replace_search_with_plain_string(tmp_path, fixtures_path):
     assert result.exit_code == 0
 
 
+def test_replace_with_empty_string(tmp_path, fixtures_path):
+    """Replace should not worry if the replace value has version info."""
+    from tomlkit import dumps
+
+    # Arrange
+    config_path = tmp_path / "pyproject.toml"
+    config_path.write_text(dumps(TEST_REPLACE_CONFIG))
+    doc_path = tmp_path / "docs.yaml"
+    doc_path.write_text("We should censor profanity\n\n")
+
+    runner: CliRunner = CliRunner()
+    with inside_dir(tmp_path):
+        result: Result = runner.invoke(
+            cli.cli,
+            [
+                "replace",
+                "--no-configured-files",
+                "--allow-dirty",
+                "--search",
+                "profanity",
+                "--replace",
+                "",
+                "./docs.yaml",
+            ],
+        )
+
+    if result.exit_code != 0:
+        print("Here is the output:")
+        print(result.output)
+        print(traceback.print_exception(result.exc_info[1]))
+
+    assert result.exit_code == 0
+
+
 def test_valid_regex_not_ignoring_regex(tmp_path: Path, caplog) -> None:
     """A search string not meant to be a regex (but is) is still found and replaced correctly."""
     # Arrange

tests/test_configuredfile.py

@@ -0,0 +1,58 @@
+"""Tests for the ConfiguredFile class."""
+from bumpversion.files import ConfiguredFile, FileChange
+from bumpversion.version_part import VersionConfig
+
+
+class TestConfiguredFile:
+    """Tests for the ConfiguredFile class."""
+
+    class TestClassCreation:
+        """Tests for the creation of the ConfiguredFile class."""
+
+        def test_file_change_is_identical_to_input(self):
+            """Test that the file change is identical to the input, but not the same object."""
+            change = FileChange(
+                filename="boobar.txt",
+                search="dashes: {current_version}",
+                replace="dashes: {new_version}",
+                parse=r"(?P<major>\d+)-(?P<minor>\d+)-(?P<patch>\d+)",
+                serialize=("{major}-{minor}-{patch}",),
+                regex=True,
+                ignore_missing_version=False,
+            )
+            version_config = VersionConfig(
+                parse="(?P<major>\\d+)\\.(?P<minor>\\d+)\\.(?P<patch>\\d+)(\\-(?P<release>[a-z]+))?",
+                serialize=("{major}.{minor}.{patch}",),
+                search="{current_version}",
+                replace="{new_version}",
+            )
+            cfg_file = ConfiguredFile(change, version_config)
+            assert cfg_file.file_change == change
+            assert cfg_file.file_change is not change
+
+        def test_version_config_uses_file_change_attrs(self):
+            """Test that the version config uses the file change attributes, and the original part configs."""
+            change = FileChange(
+                filename="boobar.txt",
+                search="dashes: {current_version}",
+                replace="dashes: {new_version}",
+                parse=r"(?P<major>\d+)-(?P<minor>\d+)-(?P<patch>\d+)",
+                serialize=("{major}-{minor}-{patch}",),
+                regex=True,
+                ignore_missing_version=False,
+            )
+            version_config = VersionConfig(
+                parse="(?P<major>\\d+)\\.(?P<minor>\\d+)\\.(?P<patch>\\d+)(\\-(?P<release>[a-z]+))?",
+                serialize=("{major}.{minor}.{patch}",),
+                search="{current_version}",
+                replace="{new_version}",
+            )
+            expected = VersionConfig(
+                parse=change.parse,
+                search=change.search,
+                replace=change.replace,
+                serialize=change.serialize,
+                part_configs=version_config.part_configs,
+            )
+            cfg_file = ConfiguredFile(change, version_config)
+            assert cfg_file.version_config == expected