             ).wait(),
             GraphQLResult(data: [
                 "echo": [
-                    "field1": "defaultValue1"
+                    "field1": .null
                 ]
             ])
         )

            try graphql(
                schema: schema,
                request: """
                query echo($field1: String) {
                    echo (
                        field1: $field1
                    ) {

                    "field1": "defaultValue1"
                ]
            ])
        )
        
        // Test variable doesn't get argument default
        XCTAssertTrue(
            try graphql(
                schema: schema,
                request: """
                query echo($field1: String!) {
                    echo (
                        field1: $field1
                    ) {
                        field1
                    }
                }
                """,
                eventLoopGroup: group,
                variableValues: [:]
            ).wait()
            .errors.count > 0
        )
    }
    
