move everything into snapshot-based testing; update it a bit

generate/testdata/SimpleInput.graphql.go

@@ -0,0 +1,33 @@
+package test
+
+// Code generated by github.com/Khan/genql, DO NOT EDIT.
+
+import (
+	"context"
+
+	"github.com/Khan/genql/graphql"
+)
+
+type SimpleInputQueryResponse struct {
+	User *User `json:"user"`
+}
+
+type User struct {
+	Id string `json:"id"`
+}
+
+func SimpleInputQuery(client *graphql.Client, name string) (*SimpleInputQueryResponse, error) {
+	variables := map[string]interface{}{
+		"name": name,
+	}
+
+	var retval SimpleInputQueryResponse
+	err := client.MakeRequest(context.Background(), `
+query SimpleInputQuery ($name: String!) {
+	user(query: {name:$name}) {
+		id
+	}
+}
+`, &retval, variables)
+	return &retval, err
+}