synchronous message

test.rb

some_provider.given("a thing", "foo" => "bar")
             .and("another thing", "blah" => "blah")
             .upon_receiving("some message")
             .with(
                contents: {"the" => "contents"}, 
                 metadata: {"some" => "info"})
             .will_respond_with(
                contents: {"the" => "response"},
                metadata: {"some" => "other info"}
              )
lambda_client = AWS::Lamda::Client.new

client = SomeProviderClient.new(lambda_client)
response_message = client.send_request_message(
    contents: {"the" => "contents"}, 
    metadata: {"some" => "info"}
)