Put app strings into a YAML file for easy editing by product owner

tests/utils/test_localization.py

@@ -0,0 +1,33 @@
+import pytest
+from atst.utils.localization import (
+    translate,
+    load_cached_translations_file,
+    LocalizationInvalidKeyError,
+)
+
+
+def test_loading_cached_translations_file_returns_the_file_contents():
+    file_name = "translations.yaml"
+    assert load_cached_translations_file(file_name) == open(file_name).read()
+
+
+def test_looking_up_existing_key():
+    assert translate("testing.example_string") == "Hello World"
+
+
+def test_nested_keys():
+    assert translate("testing.nested.example") == "Hello nested example"
+
+
+def test_with_variables():
+    assert (
+        translate("testing.example_with_variables", {"name": "Alice"})
+        == "Hello, Alice!"
+    )
+
+    assert translate("testing.example_with_variables", {"name": "Bob"}) == "Hello, Bob!"
+
+
+def test_looking_up_non_existent_key():
+    with pytest.raises(LocalizationInvalidKeyError):
+        translate("testing.an.invalid_key")