Switch Enum tests to not depend on JSON representation

If we add additional fields (e.g. astNode) into values of enum these test
will be broken.

Author: IvanGoncharov

src/utilities/__tests__/buildASTSchema-test.js

@@ -538,29 +538,18 @@ type Query {
     const ast = parse(body);
     const schema = buildASTSchema(ast);
 
-    expect(schema.getType('MyEnum').getValues()).to.deep.equal([
-      {
-        name: 'VALUE',
-        description: '',
-        isDeprecated: false,
-        deprecationReason: undefined,
-        value: 'VALUE'
-      },
-      {
-        name: 'OLD_VALUE',
-        description: '',
-        isDeprecated: true,
-        deprecationReason: 'No longer supported',
-        value: 'OLD_VALUE'
-      },
-      {
-        name: 'OTHER_VALUE',
-        description: '',
-        isDeprecated: true,
-        deprecationReason: 'Terrible reasons',
-        value: 'OTHER_VALUE'
-      }
-    ]);
+    const myEnum = schema.getType('MyEnum');
+
+    const value = myEnum.getValue('VALUE');
+    expect(value.isDeprecated).to.equal(false);
+
+    const oldValue = myEnum.getValue('OLD_VALUE');
+    expect(oldValue.isDeprecated).to.equal(true);
+    expect(oldValue.deprecationReason).to.equal('No longer supported');
+
+    const otherValue = myEnum.getValue('OTHER_VALUE');
+    expect(otherValue.isDeprecated).to.equal(true);
+    expect(otherValue.deprecationReason).to.equal('Terrible reasons');
 
     const rootFields = schema.getType('Query').getFields();
     expect(rootFields.field1.isDeprecated).to.equal(true);

src/utilities/__tests__/extendSchema-test.js

@@ -214,16 +214,10 @@ union SomeUnion = Foo | Biz
     expect(deprecatedFieldDef.deprecationReason).to.equal('not used anymore');
 
     const deprecatedEnumDef = extendedSchema
-      .getType('EnumWithDeprecatedValue');
-    expect(deprecatedEnumDef.getValues()).to.deep.equal([
-      {
-        name: 'DEPRECATED',
-        description: '',
-        isDeprecated: true,
-        deprecationReason: 'do not use',
-        value: 'DEPRECATED'
-      }
-    ]);
+      .getType('EnumWithDeprecatedValue')
+      .getValue('DEPRECATED');
+    expect(deprecatedEnumDef.isDeprecated).to.equal(true);
+    expect(deprecatedEnumDef.deprecationReason).to.equal('do not use');
   });
 
   it('extends objects with deprecated fields', () => {