Add test case : theme with no locale set

Author: Guts

tests/basic_setup/mkdocs_theme_no_locale.yml

@@ -0,0 +1,9 @@
+site_name: test gitrevisiondatelocalized_plugin
+use_directory_urls: true
+
+theme:
+    name: 'material'
+
+plugins:
+    - search
+    - git-revision-date-localized

tests/test_basic.py

@@ -289,6 +289,21 @@ def test_material_theme(tmp_path):
     assert re.search(r"Letztes Update\:\s[\w].+", contents)
 
 
+def test_material_theme_no_locale(tmp_path):
+    """
+    When using mkdocs-material theme, test correct working
+    """
+    # theme set to 'material' with 'language' set to 'de'
+    testproject_path = validate_mkdocs_file(
+        tmp_path, "tests/basic_setup/mkdocs_theme_no_locale.yml"
+    )
+
+    # In mkdocs-material, a 'last update' should appear
+    # in German because locale is set to 'de'
+    index_file = testproject_path / "site/index.html"
+    contents = index_file.read_text(encoding="utf8")
+    assert re.search(r"Last update\:\s[\w].+", contents)
+
 def test_type_timeago(tmp_path):
     # type: 'timeago'
     testproject_path = validate_mkdocs_file(