Improve tests and utils around public schema #118
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I added the link utils Jeff created (
extractLinkImplementations
).I changed the logic of
transformSupergraphToPublicSchema
andcontainsSupergraphSpec
to reuse what is defined insrc/specifications
. The supergraph to public schema transformation supports now aliasing.I added quite a lot of tests to check if the
publicSdl
we're producing is correct.The
assertCompositionSuccess
function that is used in tests, builds a GraphQLSchema instance from thepublicSdl
(in case of Apollo it uses their own api to achieve the same thing) and validates it. This way we can assume thepublicSdl
is valid and executable.