Add test cases for @provides and @external

Author: eddeee888

packages/plugins/typescript/resolvers/tests/ts-resolvers.federation.spec.ts

@@ -366,12 +366,17 @@ describe('TypeScript Resolvers Plugin + Apollo Federation', () => {
 
       type Book {
         author: User @provides(fields: "name")
+        editor: User @provides(fields: "company { taxCode }")
       }
 
       type User @key(fields: "id") {
         id: ID!
         name: String @external
         username: String @external
+        address: Address
+        dateOfBirth: DateOfBirth
+        placeOfBirth: PlaceOfBirth
+        company: Company
       }
 
       type Address {
@@ -389,6 +394,11 @@ describe('TypeScript Resolvers Plugin + Apollo Federation', () => {
         city: String!
         country: String!
       }
+
+      type Company @external {
+        name: String!
+        taxCode: String!
+      }
     `;
 
     const content = await generate({
@@ -398,12 +408,13 @@ describe('TypeScript Resolvers Plugin + Apollo Federation', () => {
       },
     });
 
-    // UserResolvers should not have a resolver function of name field
+    // UserResolvers should not have `username` resolver because it is marked with `@external`
+    // UserResolvers should have `name` resolver because whilst it is marked with `@external`, it is provided by `Book.author`
     expect(content).toBeSimilarStringTo(`
       export type UserResolvers<ContextType = any, ParentType extends ResolversParentTypes['User'] = ResolversParentTypes['User'], FederationType extends FederationTypes['User'] = FederationTypes['User']> = {
         __resolveReference?: ReferenceResolver<Maybe<ResolversTypes['User']>, { __typename: 'User' } & GraphQLRecursivePick<FederationType, {"id":true}>, ContextType>;
-        id?: Resolver<ResolversTypes['ID'], { __typename: 'User' } & GraphQLRecursivePick<FederationType, {"id":true}>, ContextType>;
-        name?: Resolver<Maybe<ResolversTypes['String']>, { __typename: 'User' } & GraphQLRecursivePick<FederationType, {"id":true}>, ContextType>;
+        id?: Resolver<ResolversTypes['ID'], ParentType, ContextType>;
+        name?: Resolver<Maybe<ResolversTypes['String']>, ParentType, ContextType>;
       };
     `);
 
@@ -414,6 +425,13 @@ describe('TypeScript Resolvers Plugin + Apollo Federation', () => {
       };
     `);
 
+    // CompanyResolvers should only have taxCode resolver because it is part of the `@provides` directive in `Book.editor`
+    expect(content).toBeSimilarStringTo(`
+      export type CompanyResolvers<ContextType = any, ParentType extends ResolversParentTypes['Company'] = ResolversParentTypes['Company']> = {
+        taxCode?: Resolver<ResolversTypes['String'], ParentType, ContextType>;
+      };
+    `);
+
     // DateOfBirthResolvers should not be generated because there is no field not marked with @external
     expect(content).not.toBeSimilarStringTo('export type DateOfBirthResolvers');