Add a pure integration test to configure_for/test_update_recipe.py

[chrisbillowsMO]

During #18 / #227 an "integration test" was added to configure_for/test_update_recipe.py as test_main.

A pure integration test should be added. This should test the two functions create_recipe and write_recipe working together.

test_main should then be rebadged as a functional test.

See this comment on #227 from @ehogan:

We agreed when we spoke earlier that it made sense to add the integration test as a separate test, and keep the main test as a "functional" test. Happy for this to be done via a separate issue