Extend tests.

src/antsibull_changelog/config.py

@@ -458,7 +458,12 @@ def __init__(
 
         self.output_formats = set()
         for extension in self.config.get("output_formats", ["rst"]):
-            self.output_formats.add(TextFormat.from_extension(extension))
+            try:
+                self.output_formats.add(TextFormat.from_extension(extension))
+            except ValueError as exc:
+                raise ChangelogError(
+                    f"Found unknown extension in output_formats: {exc}"
+                ) from exc
 
         self._validate_config(ignore_is_other_project)
 

tests/functional/test_changelog_basic_collection.py

@@ -135,6 +135,14 @@ def test_changelog_release_empty(  # pylint: disable=redefined-outer-name
     assert collection_changelog.run_tool("generate", ["-v", "--refresh"]) == 0
     assert collection_changelog.diff().unchanged
 
+    assert (
+        collection_changelog.run_tool(
+            "generate", ["-v", "--refresh", "--output", "CHANGELOG.md"]
+        )
+        == 5
+    )
+    assert collection_changelog.diff().unchanged
+
     assert (
         collection_changelog.run_tool(
             "release", ["-v", "--codename", "primetime", "--date", "2020-01-03"]
@@ -1385,6 +1393,57 @@ def test_changelog_release_simple(  # pylint: disable=redefined-outer-name
 """
     )
 
+    # Generate changelog for 1.0.0 only as MD
+    assert (
+        collection_changelog.run_tool(
+            "generate",
+            [
+                "-vvv",
+                "--output",
+                "changelog-1.0.0.md",
+                "--output-format",
+                "md",
+                "--only-latest",
+                "1.0.0",
+            ],
+        )
+        == 0
+    )
+
+    diff = collection_changelog.diff()
+    assert diff.added_dirs == []
+    assert diff.added_files == ["changelog-1.0.0.md"]
+    assert diff.removed_dirs == []
+    assert diff.removed_files == []
+    assert diff.changed_files == []
+
+    assert diff.file_contents["changelog-1.0.0.md"].decode("utf-8") == (
+        r"""<a id="release-summary"></a>
+## Release Summary
+
+This is the first proper release\.
+
+<a id="minor-changes"></a>
+## Minor Changes
+
+* baz lookup \- no longer ignores the <code>bar</code> option\.
+* test \- has a new option <code>foo</code>\.
+
+<a id="new-plugins"></a>
+## New Plugins
+
+<a id="lookup"></a>
+### Lookup
+
+* acme\.test\.bar \- A foo\_bar lookup
+
+<a id="new-modules"></a>
+## New Modules
+
+* acme\.test\.test \- This is a TEST module
+"""
+    )
+
 
 def test_changelog_release_simple_no_galaxy(  # pylint: disable=redefined-outer-name
     collection_changelog,

tests/units/test_config.py

@@ -352,3 +352,11 @@ def test_collection_details(tmp_path):
     assert details.get_name() == "asdf"
     assert details.get_version() == "1.0.0"
     assert details.get_flatmap() is False
+
+
+def test_config_loading_bad_output_format(ansible_config_path):
+    ansible_config_path.write_text("output_formats: [foobar]")
+    paths = PathsConfig.detect()
+    collection_details = CollectionDetails(paths)
+    with pytest.raises(ChangelogError):
+        ChangelogConfig.load(paths, collection_details)