astFromValue fails with a custom scalar serializing to an object value

Author: ardatan

src/utilities/__tests__/astFromValue-test.ts

@@ -233,6 +233,24 @@ describe('astFromValue', () => {
     expect(() => astFromValue('value', returnCustomClassScalar)).to.throw(
       'Cannot convert value to AST: {}.',
     );
+
+    const returnObjectScalar = new GraphQLScalarType({
+      name: 'ReturnObjectScalar',
+      serialize() {
+        return { some: 'data' };
+      },
+    });
+
+    expect(astFromValue('value', returnObjectScalar)).to.deep.equal({
+      kind: 'ObjectValue',
+      fields: [
+        {
+          kind: 'ObjectField',
+          name: { kind: 'Name', value: 'some' },
+          value: { kind: 'StringValue', value: 'data' },
+        },
+      ],
+    });
   });
 
   it('does not converts NonNull values to NullValue', () => {