Remove duplicate test (#1240)

Author: Cito

src/utilities/__tests__/buildASTSchema-test.js

@@ -754,18 +754,6 @@ describe('Schema Builder', () => {
     expect(schema.getSubscriptionType().name).to.equal('Subscription');
   });
 
-  it('Default root operation type names', () => {
-    const schema = buildSchema(dedent`
-      type Query { str: String }
-      type Mutation { str: String }
-      type Subscription { str: String }
-    `);
-
-    expect(schema.getQueryType().name).to.equal('Query');
-    expect(schema.getMutationType().name).to.equal('Mutation');
-    expect(schema.getSubscriptionType().name).to.equal('Subscription');
-  });
-
   it('can build invalid schema', () => {
     const schema = buildSchema(dedent`
       # Invalid schema, because it is missing query root type