fix(python/sdk): Fix custom spelling property and add unit tests (#6763)

GitOrigin-RevId: c5d69d94605abad2bef7510b8ba61bfa1d079db3

assemblyai/types.py

@@ -524,7 +524,7 @@ class RawTranscriptionConfig(BaseModel):
     "Enable Topic Detection."
 
     custom_spelling: Optional[List[Dict[str, Union[str, List[str]]]]] = None
-    "Customize how words are spelled and formatted using to and from values"
+    "Customize how words are spelled and formatted using to and from values."
 
     disfluencies: Optional[bool] = None
     "Transcribe Filler Words, like 'umm', in your media file."
@@ -916,18 +916,21 @@ def iab_categories(self, enable: Optional[bool]) -> None:
 
     @property
     def custom_spelling(self) -> Optional[Dict[str, Union[str, List[str]]]]:
-        "Returns the current set custom spellings."
+        """
+        Returns the current set of custom spellings. For each key-value pair in the dictionary,
+        the key is the 'to' field, and the value is the 'from' field.
+        """
 
         if self._raw_transcription_config.custom_spelling is None:
             return None
 
         custom_spellings = {}
         for custom_spelling in self._raw_transcription_config.custom_spelling:
-            _from = custom_spelling["from"]
-            if isinstance(_from, str):
-                custom_spellings[_from] = custom_spelling["to"]
-            else:
-                raise ValueError("`from` argument must be a string!")
+            _to = custom_spelling["to"]
+            if not isinstance(_to, str):
+                raise ValueError("`to` argument must be a string!")
+
+            custom_spellings[_to] = custom_spelling["from"]
 
         return custom_spellings if custom_spelling else None
 
@@ -1231,13 +1234,14 @@ def set_custom_spelling(
         Customize how given words are being spelled or formatted in the transcription's text.
 
         Args:
-            replacement: A dictionary that contains the replacement object (see below example)
+            replacement: A dictionary that contains the replacement object (see below example).
+                For each key-value pair, the key is the 'to' field, and the value is the 'from' field.
             override: If `True` `replacement` gets overriden with the given `replacement` argument, otherwise merged.
 
         Example:
             ```
             config.custom_spelling({
-                "AssemblyAI": "AssemblyAI",
+                "AssemblyAI": "assemblyAI",
                 "Kubernetes": ["k8s", "kubernetes"]
             })
             ```
@@ -1619,7 +1623,7 @@ class BaseTranscript(BaseModel):
     "Enable Topic Detection."
 
     custom_spelling: Optional[List[Dict[str, Union[str, List[str]]]]] = None
-    "Customize how words are spelled and formatted using to and from values"
+    "Customize how words are spelled and formatted using to and from values."
 
     disfluencies: Optional[bool] = None
     "Transcribe Filler Words, like 'umm', in your media file."

tests/unit/test_custom_spelling.py

@@ -0,0 +1,93 @@
+import factory
+from pytest_httpx import HTTPXMock
+
+import tests.unit.unit_test_utils as unit_test_utils
+import assemblyai as aai
+from tests.unit import factories
+
+aai.settings.api_key = "test"
+
+
+class CustomSpellingFactory(factory.Factory):
+    class Meta:
+        model = dict  # The model is a dictionary
+        rename = {"_from": "from"}
+
+    _from = factory.List([factory.Faker("word")])  # List of words in 'from'
+    to = factory.Faker("word")  # one word in 'to'
+
+
+class CustomSpellingResponseFactory(factories.TranscriptCompletedResponseFactory):
+    @factory.lazy_attribute
+    def custom_spelling(self):
+        return [CustomSpellingFactory()]
+
+
+def test_custom_spelling_disabled_by_default(httpx_mock: HTTPXMock):
+    """
+    Tests that not calling `set_custom_spelling()` on the `TranscriptionConfig`
+    will result in the default behavior of it being excluded from the request body.
+    """
+    request_body, transcript = unit_test_utils.submit_mock_transcription_request(
+        httpx_mock,
+        mock_response=factories.generate_dict_factory(
+            factories.TranscriptCompletedResponseFactory
+        )(),
+        config=aai.TranscriptionConfig(),
+    )
+    assert request_body.get("custom_spelling") is None
+    assert transcript.json_response.get("custom_spelling") is None
+
+
+def test_custom_spelling_set_config_succeeds():
+    """
+    Tests that calling `set_custom_spelling()` on the `TranscriptionConfig`
+    will set the values correctly, and that the config values can be accessed again
+    through the custom_spelling property.
+    """
+    config = aai.TranscriptionConfig()
+
+    # Setting a string will be put in a list
+    config.set_custom_spelling({"AssemblyAI": "assemblyAI"})
+    assert config.custom_spelling == {"AssemblyAI": ["assemblyAI"]}
+
+    # Setting multiple pairs works
+    config.set_custom_spelling(
+        {"AssemblyAI": "assemblyAI", "Kubernetes": ["k8s", "kubernetes"]}, override=True
+    )
+    assert config.custom_spelling == {
+        "AssemblyAI": ["assemblyAI"],
+        "Kubernetes": ["k8s", "kubernetes"],
+    }
+
+
+def test_custom_spelling_enabled(httpx_mock: HTTPXMock):
+    """
+    Tests that calling `set_custom_spelling()` on the `TranscriptionConfig`
+    will result in correct `custom_spelling` in the request body, and that the
+    response is properly parsed into the `custom_spelling` field.
+    """
+
+    mock_response = factories.generate_dict_factory(CustomSpellingResponseFactory)()
+
+    # Set up the custom spelling config based on the mocked values
+    from_ = mock_response["custom_spelling"][0]["from"]
+    to = mock_response["custom_spelling"][0]["to"]
+
+    config = aai.TranscriptionConfig().set_custom_spelling({to: from_})
+
+    request_body, transcript = unit_test_utils.submit_mock_transcription_request(
+        httpx_mock,
+        mock_response=mock_response,
+        config=config,
+    )
+
+    # Check that request body was properly defined
+    custom_spelling_response = request_body["custom_spelling"]
+    assert custom_spelling_response is not None and len(custom_spelling_response) > 0
+    assert "from" in custom_spelling_response[0]
+    assert "to" in custom_spelling_response[0]
+
+    # Check that transcript has no errors and custom spelling response corresponds to request
+    assert transcript.error is None
+    assert transcript.json_response["custom_spelling"] == custom_spelling_response