Help using Schemathesis and Ariadne for automatically generating test cases from Federation GraphQL schema

[StevenACoffman]

I'm trying to use https://github.com/schemathesis/schemathesis with an Apollo Federation schema backend by Ariadne subgraphs.

However, Schemathesis requires that custom scalars (like those necessary for Apollo Federation) be registered with it per https://github.com/schemathesis/schemathesis/blob/master/docs/guides/graphql-custom-scalars.md

I'm trying to import those necessary from Ariadne but running into some problems. Has anyone done this?

https://www.apollographql.com/docs/graphos/schema-design/federated-schemas/reference/subgraph-spec#subgraph-schema-additions

[StevenACoffman]

@mociepka @reallistic Do you have any guidance on where the scalars for Apollo federation are implemented in Ariadne?

[reallistic]

@StevenACoffman the code that loads the federated schema types is here.

There is no existing api to import those to provide them to schemathesis. You might be able to use the subgraphs GraphQLSchema object to find them and register them.