Added more test cases

rfcs/test-cases/basic-example-with-requires/composite/a.graphql

@@ -0,0 +1,9 @@
+type User @extends @key(fields: "id") {
+  a: String
+  id: ID! @external
+}
+
+type Query {
+  a: String
+  userById(id: ID!): User @lookup
+}

rfcs/test-cases/basic-example-with-requires/composite/b.graphql

@@ -0,0 +1,9 @@
+type User @key(fields: "id") {
+  b(uuid: String! @requires(fields: "uuid")): String
+  id: ID! @external
+}
+
+type Query {
+  b: String
+  userById(id: ID!): User @lookup
+}

rfcs/test-cases/basic-example-with-requires/composite/c.graphql

@@ -0,0 +1,10 @@
+type User @key(fields: "id") {
+  c: String
+  id: ID!
+  uuid: ID!
+}
+
+type Query {
+  c: User
+  userById(id: ID!): User @lookup
+}

rfcs/test-cases/basic-example-with-requires/composite/extra.graphql

@@ -0,0 +1,3 @@
+type Query {
+  extra: String
+}

rfcs/test-cases/basic-example-with-requires/federation/a.graphql

@@ -1,7 +1,6 @@
 type User @extends @key(fields: "id") {
   a: String
   id: ID! @external
-  uuid: ID! @external
 }
 
 type Query {

rfcs/test-cases/basic-example-with-requires/federation/b.graphql

@@ -1,4 +1,4 @@
-type User @extends @key(fields: "id") {
+type User @key(fields: "id") {
   b: String @requires(fields: "uuid")
   id: ID! @external
   uuid: ID! @external