update product subgraph test schema with additional @key test cases

[dariuszkuc]

Update product subgraph with additional entites to separate testing for various @key test cases. Previously we were testing single entity that was supposed to define multiple @key directives. This was problematic as not all implementations support repeatable directives and we never checked whether given @key test case was actually present in the schema (test was executing _entities query only).

Schema changes (existing fields and types are omitted for clarity):

type Product @key(fields: "id") @key(fields: "sku package") @key(fields: "sku variation { id }") {
  # new field
  research: [ProductResearch!]!
}

type DeprecatedProduct @key(fields: "sku package") {
  sku: String!
  package: String!
  reason: String
  createdBy: User
}

type ProductResearch @key(fields: "study { caseNumber }") {
  study: CaseStudy!
  outcome: String
}

type CaseStudy {
  caseNumber: ID!
  description: String
}

extend type Query {
  # new query
  deprecatedProduct(sku: String!, package: String!): DeprecatedProduct @deprecated(reason: "Use product query instead")
}

Update @key tests cases to verify:

• single field @key functionality against User type
• multiple field @key functionality against DeprecatedProduct type
• composite object @key functionality against ProductResearch type
• repeatable @key functionality against Product type (this test combines old tests into a single one)

Related Issues:

• resolves @key tests should verify existence of key directive definitions in SDL #144
• resolves Update products subgraph with additional entities to test out @key directive use cases #149

[kdawgwilk]

I like that you left the repeated @key on Product to test for repeatability of the directive 👍

[hwillson]

Awesome @dariuszkuc - thanks very much for tackling this! 🎉