Increase test coverage of zim/metadata.py

Author: benoit74

tests/zim/test_metadata.py

@@ -0,0 +1,32 @@
+import re
+from typing import Iterable, Union
+
+import pytest
+
+from zimscraperlib.zim import metadata
+
+
+@pytest.mark.parametrize(
+    "name, value",
+    [
+        ("Language", "fra"),
+        ("Language", "fra,eng"),
+        ("Language", ["fra", "eng"]),
+        ("Other", "not_an_iso_639_3_code"),
+    ],
+)
+def test_validate_language_valid(name: str, value: Union[Iterable[str], str]):
+    metadata.validate_language(name, value)
+
+
+@pytest.mark.parametrize(
+    "name, value",
+    [
+        ("Language", "fr"),
+        ("Language", "fra;eng"),
+        ("Language", "fra, eng"),
+    ],
+)
+def test_validate_language_invalid(name: str, value: Union[Iterable[str], str]):
+    with pytest.raises(ValueError, match=re.escape("is not ISO-639-3")):
+        metadata.validate_language(name, value)