Add unit tests for authentication and webhook parsing

- Implement tests for basic and bearer authentication headers in `test_auth.py`.
- Create tests for the `EasybillWebhookParser` in `test_webhooks.py`, covering JSON and form-encoded payloads, as well as a generic parse and acknowledgement method.

generated/sync/docs/Task.md

@@ -0,0 +1,45 @@
+# Task
+
+
+## Properties
+
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**category** | **str** |  | [optional] [default to null]
+**category_custom** | **str** | The name of your custom category. Can only have a value if \"category\" is \"CUSTOM\". | [optional] [default to 'null']
+**created_at** | **datetime** |  | [optional] [readonly] 
+**customer_id** | **int** |  | [optional] 
+**description** | **str** |  | [optional] [default to 'null']
+**document_id** | **int** |  | [optional] 
+**end_at** | **datetime** | The deadline | [optional] 
+**finish_at** | **datetime** | The time when the task was marked as done | [optional] [readonly] 
+**id** | **int** |  | [optional] [readonly] 
+**login_id** | **int** | When omitted or null, the currently active login is used | [optional] 
+**name** | **str** |  | 
+**position_id** | **int** |  | [optional] 
+**priority** | **str** |  | [optional] [default to 'NORMAL']
+**project_id** | **int** |  | [optional] 
+**start_at** | **datetime** |  | [optional] 
+**status** | **str** |  | 
+**status_percent** | **int** |  | [optional] 
+
+## Example
+
+```python
+from easybill_generated_sync.models.task import Task
+
+# TODO update the JSON string below
+json = "{}"
+# create an instance of Task from a JSON string
+task_instance = Task.from_json(json)
+# print the JSON string representation of the object
+print(Task.to_json())
+
+# convert the object into a dict
+task_dict = task_instance.to_dict()
+# create an instance of Task from a dict
+task_from_dict = Task.from_dict(task_dict)
+```
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+