Docs: Patching services not supported (#5577)

docs/docs/services/patching_other_services.rst

@@ -0,0 +1,52 @@
+.. _patching_other_services:
+
+
+=======================
+Patching other Services
+=======================
+
+Since ``moto`` does not support every AWS service available there is a way to patch ``boto3`` calls until they are supported.
+
+To do so, you need to mock the ``botocore.client.BaseClient._make_api_call`` function using `mock.patch <https://docs.python.org/3/library/unittest.mock.html#patch>`_:
+
+.. sourcecode:: python
+
+    import boto3
+    import botocore
+    from unittest.mock import patch
+
+    # Original botocore _make_api_call function
+    orig = botocore.client.BaseClient._make_api_call
+    
+    # Mocked botocore _make_api_call function
+    def mock_make_api_call(self, operation_name, kwarg):
+        # For example for the Access Analyzer service
+        # As you can see the operation_name has the list_analyzers snake_case form but
+        # we are using the ListAnalyzers form.
+        # Rationale -> https://github.com/boto/botocore/blob/develop/botocore/client.py#L810:L816
+        if operation_name == 'ListAnalyzers':
+            return { "analyzers": 
+                [{
+                    "arn": "ARN", 
+                    "name": "Test Analyzer" , 
+                    "status": "Enabled", 
+                    "findings": 0, 
+                    "tags":"", 
+                    "type": "ACCOUNT", 
+                    "region": "eu-west-1"
+                    }
+                ]}
+        # If we don't want to patch the API call
+        return orig(self, operation_name, kwarg)
+
+
+    def test_list_findings():
+        client = boto3.client("accessanalyzer")
+
+        with patch('botocore.client.BaseClient._make_api_call', new=mock_make_api_call):
+            analyzers_list = client.list_analyzers()
+            assert len(analyzers_list["analyzers"]) == 1
+            # include your assertions here
+
+
+Note that this does not use Moto, to keep it simple, but if you use any ``moto``-decorators in addition to the patch, the call to ``orig(self, operation_name, kwarg)`` will be intercepted by Moto.

docs/index.rst

@@ -49,6 +49,7 @@ Additional Resources
   :caption: Implemented Services
 
   docs/services/index
+  docs/services/patching_other_services
 
 .. toctree::
   :maxdepth: 1