On Mon, Dec 11, 2017 at 1:11 PM, Carl Friedrich Bolz <cfb...@gmx.de> wrote:


> we require and have always required app-level tests for every new
> feature up to the finer details. The CPython test suite is often not
> very thorough, and we often work under the assumption that if our own
> tests about a feature work, the feature works.
>
> The coding guide states that already, but is maybe not forceful or not
> detailed enough:
>
> "adding features requires adding appropriate tests."
>
> I am open to suggestions how to make this more explicit.
>

About app-tests vs CPython test, I'd state the following:

- app-tests are what we use to check that the code we write behaves as we
intend (hence, you **need** an app test for every piece of code you write)

- cpython tests are what we use to check that our implementation is
compatible with cpython
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