chore: import upstream snapshot with attribution

tests/utils/test_enum.py

@@ -0,0 +1,41 @@
+# Copyright (c) 2023, NVIDIA CORPORATION.  All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+from nemo.utils.enum import PrettyStrEnum
+
+
+class ASRModelType(PrettyStrEnum):
+    CTC = "ctc"
+    RNNT = "rnnt"
+
+
+class TestPrettyStrEnum:
+    def test_incorrect_value(self):
+        """Test pretty error message for invalid value"""
+        try:
+            ASRModelType("incorrect")
+        except ValueError as e:
+            assert str(e) == "incorrect is not a valid ASRModelType. Possible choices: ctc, rnnt"
+
+    def test_correct_value(self):
+        """Test that correct value is accepted"""
+        assert ASRModelType("ctc") == ASRModelType.CTC
+
+    def test_str(self):
+        """
+        Test that str() returns the source value,
+        useful for serialization/deserialization and user-friendly logging
+        """
+        assert str(ASRModelType("ctc")) == "ctc"