Task: Add Netflix DGS framework and DGS codegen for GraphQL and still issued with subscriptions that not work on server and add some configurations and add webflux included web starter and removed all graphql kickstart and add frontend client with apollo client and react in typescript for graphql demo

build.gradle.kts

@@ -1,11 +1,12 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
-	id("org.springframework.boot") version "2.6.0-SNAPSHOT"
+	id("org.springframework.boot") version "2.5.3"
 	id("io.spring.dependency-management") version "1.0.11.RELEASE"
 	kotlin("jvm") version "1.5.21"
 	kotlin("plugin.spring") version "1.5.21"
 	kotlin("plugin.jpa") version "1.5.21"
+	id("com.netflix.dgs.codegen") version "5.0.5"
 }
 
 group = "com.cubetiqs"
@@ -16,16 +17,13 @@ repositories {
 	maven { url = uri("https://m.ctdn.net") }
 }
 
-extra["graphqlVersion"] = "11.0.0"
+extra["dgsVersion"] = "4.5.0"
 
 dependencies {
-	implementation("com.graphql-java:graphql-java-extended-scalars:16.0.0")
+	implementation("com.netflix.graphql.dgs:graphql-dgs-spring-boot-starter:${property("dgsVersion")}")
-	implementation("com.graphql-java-kickstart:graphql-spring-boot-starter:${property("graphqlVersion")}")
-	implementation("com.graphql-java-kickstart:playground-spring-boot-starter:${property("graphqlVersion")}")
-	implementation("com.graphql-java-kickstart:voyager-spring-boot-starter:${property("graphqlVersion")}")
-
 	implementation("org.springframework.boot:spring-boot-starter-actuator")
 	implementation("org.springframework.boot:spring-boot-starter-data-jpa")
+	implementation("org.springframework.boot:spring-boot-starter-web")
 	implementation("org.springframework.boot:spring-boot-starter-webflux")
 	implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
 	implementation("io.projectreactor.kotlin:reactor-kotlin-extensions")
@@ -38,7 +36,6 @@ dependencies {
 
 	testImplementation("org.springframework.boot:spring-boot-starter-test")
 	testImplementation("io.projectreactor:reactor-test")
-	testImplementation("com.graphql-java-kickstart:graphql-spring-boot-starter-test:${property("graphqlVersion")}")
 }
 
 tasks.withType<KotlinCompile> {
@@ -51,3 +48,9 @@ tasks.withType<KotlinCompile> {
 tasks.withType<Test> {
 	useJUnitPlatform()
 }
+
+tasks.withType<com.netflix.graphql.dgs.codegen.gradle.GenerateJavaTask> {
+	packageName = "com.cubetiqs.graphql.demo.dgmodel"
+	schemaPaths = mutableListOf("${projectDir}/src/main/resources/schema")
+	generateClient = true
+}

frontend/client/.gitignore

@@ -0,0 +1,23 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

frontend/client/README.md

@@ -0,0 +1,3 @@
+# React Client App
+- Apollo Client
+- GraphQL

frontend/client/package.json

@@ -0,0 +1,46 @@
+{
+  "name": "client",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@apollo/client": "^3.4.5",
+    "@testing-library/jest-dom": "^5.11.4",
+    "@testing-library/react": "^11.1.0",
+    "@testing-library/user-event": "^12.1.10",
+    "@types/jest": "^26.0.15",
+    "@types/node": "^12.0.0",
+    "@types/react": "^17.0.0",
+    "@types/react-dom": "^17.0.0",
+    "graphql": "^15.5.1",
+    "react": "^17.0.2",
+    "react-dom": "^17.0.2",
+    "react-scripts": "4.0.3",
+    "subscriptions-transport-ws": "^0.9.19",
+    "typescript": "^4.1.2",
+    "web-vitals": "^1.0.1"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": [
+      "react-app",
+      "react-app/jest"
+    ]
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  }
+}

frontend/client/public/index.html

@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#000000" />
+    <meta
+      name="description"
+      content="Web site created using create-react-app"
+    />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
+    <!--
+      manifest.json provides metadata used when your web app is installed on a
+      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>React App</title>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>

frontend/client/public/manifest.json

@@ -0,0 +1,25 @@
+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}

frontend/client/public/robots.txt

@@ -0,0 +1,3 @@
+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow:

frontend/client/src/App.tsx

@@ -0,0 +1,65 @@
+import React from 'react';
+import './App.css';
+import {gql, useQuery, useSubscription} from "@apollo/client";
+
+interface User {
+    id: number
+    code: string
+    name: string
+}
+
+interface Account {
+    id: number
+    code: string
+    balance: number
+    user: User
+}
+
+interface AccountResult {
+    fetchAccounts: Array<Account>
+}
+
+const ACCOUNTS = gql`
+    {
+        fetchAccounts {
+            id
+            code
+            balance
+            user {
+                code
+                name
+            }
+        }
+    }
+`
+
+const HELLO = gql`
+    subscription {
+        hello
+    }
+`
+
+function App() {
+    // const {error, loading, data} = useQuery<AccountResult>(ACCOUNTS)
+    const {error, loading, data} = useSubscription(HELLO)
+
+    return (
+        <>
+            <h1>Accounts</h1>
+            {
+                loading || !data ? <p>Loading...</p> :
+                    // data.fetchAccounts.map(account => (
+                    //         <>
+                    //             <div>Account ID: {account.id}</div>
+                    //             <div>Account Code: {account.code}</div>
+                    //             <div>Account User: {account.user.name}</div>
+                    //         </>
+                    //     )
+                    // )
+                <p>data</p>
+            }
+        </>
+    );
+}
+
+export default App;

frontend/client/src/index.tsx

@@ -0,0 +1,54 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import './index.css';
+import App from './App';
+import reportWebVitals from './reportWebVitals';
+
+import {split, HttpLink, ApolloClient, InMemoryCache} from '@apollo/client';
+import {ApolloProvider} from '@apollo/client/react';
+import {getMainDefinition} from '@apollo/client/utilities';
+import {WebSocketLink} from '@apollo/client/link/ws';
+
+const APP_HOST = process.env.APP_HOST || 'localhost:8081'
+
+const httpLink = new HttpLink({
+    uri: `http://${APP_HOST}/graphql`
+});
+
+const wsLink = new WebSocketLink({
+    uri: `ws://${APP_HOST}/subscriptions`,
+    options: {
+        reconnect: true
+    }
+});
+
+const splitLink = split(
+    ({query}) => {
+        const definition = getMainDefinition(query);
+        return (
+            definition.kind === 'OperationDefinition' &&
+            definition.operation === 'subscription'
+        );
+    },
+    wsLink,
+    httpLink,
+);
+
+const client = new ApolloClient({
+    link: splitLink,
+    cache: new InMemoryCache()
+});
+
+ReactDOM.render(
+    <React.StrictMode>
+        <ApolloProvider client={client}>
+            <App/>
+        </ApolloProvider>
+    </React.StrictMode>,
+    document.getElementById('root')
+);
+
+// If you want to start measuring performance in your app, pass a function
+// to log results (for example: reportWebVitals(console.log))
+// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
+reportWebVitals();

frontend/client/src/react-app-env.d.ts

@@ -0,0 +1 @@
+/// <reference types="react-scripts" />

frontend/client/src/reportWebVitals.ts

@@ -0,0 +1,15 @@
+import { ReportHandler } from 'web-vitals';
+
+const reportWebVitals = (onPerfEntry?: ReportHandler) => {
+  if (onPerfEntry && onPerfEntry instanceof Function) {
+    import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
+      getCLS(onPerfEntry);
+      getFID(onPerfEntry);
+      getFCP(onPerfEntry);
+      getLCP(onPerfEntry);
+      getTTFB(onPerfEntry);
+    });
+  }
+};
+
+export default reportWebVitals;

frontend/client/src/setupTests.ts

@@ -0,0 +1,5 @@
+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom';

frontend/client/tsconfig.json

@@ -0,0 +1,26 @@
+{
+  "compilerOptions": {
+    "target": "es5",
+    "lib": [
+      "dom",
+      "dom.iterable",
+      "esnext"
+    ],
+    "allowJs": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "allowSyntheticDefaultImports": true,
+    "strict": true,
+    "forceConsistentCasingInFileNames": true,
+    "noFallthroughCasesInSwitch": true,
+    "module": "esnext",
+    "moduleResolution": "node",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "jsx": "react-jsx"
+  },
+  "include": [
+    "src"
+  ]
+}

src/main/kotlin/com/cubetiqs/graphql/demo/config/GraphQLConfig.kt

@@ -1,15 +1,6 @@
 package com.cubetiqs.graphql.demo.config
 
-import graphql.scalars.ExtendedScalars
-import graphql.schema.idl.RuntimeWiring
-import org.springframework.context.annotation.Bean
 import org.springframework.context.annotation.Configuration
 
 @Configuration
-class GraphQLConfig {
+class GraphQLConfig
-    @Bean
-    fun extendsScalars(): RuntimeWiring.Builder {
-        return RuntimeWiring.newRuntimeWiring()
-            .scalar(ExtendedScalars.DateTime)
-    }
-}

src/main/kotlin/com/cubetiqs/graphql/demo/config/WebConfig.kt

@@ -0,0 +1,18 @@
+package com.cubetiqs.graphql.demo.config
+
+import org.springframework.context.annotation.Configuration
+import org.springframework.web.servlet.config.annotation.CorsRegistry
+import org.springframework.web.servlet.config.annotation.EnableWebMvc
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer
+
+@Configuration
+@EnableWebMvc
+class WebConfig : WebMvcConfigurer {
+    override fun addCorsMappings(corsRegistry: CorsRegistry) {
+        println("Hello World")
+        corsRegistry.addMapping("/**")
+            .allowedOrigins("*")
+            .allowedMethods("*")
+            .maxAge(3600)
+    }
+}

src/main/kotlin/com/cubetiqs/graphql/demo/context/GMutation.kt

@@ -1,12 +1,8 @@
 package com.cubetiqs.graphql.demo.context
 
-import org.springframework.core.annotation.AliasFor
+import com.netflix.graphql.dgs.DgsComponent
-import org.springframework.stereotype.Component
 
 @Retention(AnnotationRetention.RUNTIME)
 @Target(AnnotationTarget.CLASS)
-@Component
+@DgsComponent
-annotation class GMutation(
+annotation class GMutation
-    @get:AliasFor(annotation = Component::class)
-    val value: String = "",
-)

src/main/kotlin/com/cubetiqs/graphql/demo/context/GQuery.kt

@@ -1,12 +1,8 @@
 package com.cubetiqs.graphql.demo.context
 
-import org.springframework.core.annotation.AliasFor
+import com.netflix.graphql.dgs.DgsComponent
-import org.springframework.stereotype.Component
 
 @Retention(AnnotationRetention.RUNTIME)
 @Target(AnnotationTarget.CLASS)
-@Component
+@DgsComponent
-annotation class GQuery(
+annotation class GQuery
-    @get:AliasFor(annotation = Component::class)
-    val value: String = "",
-)

src/main/kotlin/com/cubetiqs/graphql/demo/context/GSubscription.kt

@@ -0,0 +1,8 @@
+package com.cubetiqs.graphql.demo.context
+
+import com.netflix.graphql.dgs.DgsComponent
+
+@Retention(AnnotationRetention.RUNTIME)
+@Target(AnnotationTarget.CLASS)
+@DgsComponent
+annotation class GSubscription

src/main/kotlin/com/cubetiqs/graphql/demo/resolver/mutation/AccountMutationResolver.kt

@@ -6,20 +6,26 @@ import com.cubetiqs.graphql.demo.domain.account.AccountInput
 import com.cubetiqs.graphql.demo.domain.account.AccountMapper
 import com.cubetiqs.graphql.demo.repository.AccountRepository
 import com.cubetiqs.graphql.demo.repository.UserRepository
-import graphql.kickstart.tools.GraphQLMutationResolver
+import com.netflix.graphql.dgs.DgsData
+import com.netflix.graphql.dgs.DgsMutation
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.transaction.annotation.Propagation
 import org.springframework.transaction.annotation.Transactional
 
 @GMutation
-class AccountMutationResolver @Autowired constructor(
+class AccountMutationResolver {
-    private val accountRepository: AccountRepository,
+    @Autowired
-    private val userRepository: UserRepository,
+    private lateinit var accountRepository: AccountRepository
-) : GraphQLMutationResolver {
+
+    @Autowired
+    private lateinit var userRepository: UserRepository
+
+    @DgsData(parentType = "Mutation", field = "openAccount")
     @Transactional(propagation = Propagation.REQUIRES_NEW)
     fun openAccount(input: AccountInput): Account {
         val account = AccountMapper.fromInputToAccount(input)
-        val user = userRepository.findById(input.userId ?: 0).orElse(null) ?: throw Exception("User not found to open an account!")
+        val user = userRepository.findById(input.userId ?: 0).orElse(null)
+            ?: throw Exception("User not found to open an account!")
         account.user = user
         return accountRepository.save(account)
     }

src/main/kotlin/com/cubetiqs/graphql/demo/resolver/mutation/UserMutationResolver.kt

@@ -5,7 +5,7 @@ import com.cubetiqs.graphql.demo.domain.user.User
 import com.cubetiqs.graphql.demo.domain.user.UserInput
 import com.cubetiqs.graphql.demo.domain.user.UserMapper
 import com.cubetiqs.graphql.demo.repository.UserRepository
-import graphql.kickstart.tools.GraphQLMutationResolver
+import com.netflix.graphql.dgs.DgsMutation
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.transaction.annotation.Propagation
 import org.springframework.transaction.annotation.Transactional
@@ -13,7 +13,8 @@ import org.springframework.transaction.annotation.Transactional
 @GMutation
 class UserMutationResolver @Autowired constructor(
     private val userRepository: UserRepository,
-) : GraphQLMutationResolver {
+) {
+    @DgsMutation(field = "createUser")
     @Transactional(propagation = Propagation.REQUIRES_NEW)
     fun createUser(input: UserInput): User {
         if (userRepository.existsAllByUsername(input.username ?: "")) throw Exception("Username has been already existed!")

src/main/kotlin/com/cubetiqs/graphql/demo/resolver/query/AccountQueryResolver.kt

@@ -3,14 +3,15 @@ package com.cubetiqs.graphql.demo.resolver.query
 import com.cubetiqs.graphql.demo.context.GQuery
 import com.cubetiqs.graphql.demo.domain.account.Account
 import com.cubetiqs.graphql.demo.repository.AccountRepository
-import graphql.kickstart.tools.GraphQLQueryResolver
+import com.netflix.graphql.dgs.DgsQuery
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.data.domain.Pageable
 
 @GQuery
 class AccountQueryResolver @Autowired constructor(
     private val accountRepository: AccountRepository,
-) : GraphQLQueryResolver {
+) {
+    @DgsQuery(field = "fetchAccounts")
     fun fetchAccounts(): Collection<Account> {
         val accounts = accountRepository.findAll(Pageable.unpaged())
         return accounts.content

src/main/kotlin/com/cubetiqs/graphql/demo/resolver/query/HelloQueryResolver.kt

@@ -1,13 +1,19 @@
 package com.cubetiqs.graphql.demo.resolver.query
 
 import com.cubetiqs.graphql.demo.context.GQuery
-import graphql.kickstart.tools.GraphQLQueryResolver
+import com.netflix.graphql.dgs.DgsQuery
 import reactor.core.publisher.Mono
 import java.util.concurrent.CompletableFuture
 
 @GQuery
-class HelloQueryResolver : GraphQLQueryResolver {
+class HelloQueryResolver {
+    @DgsQuery(field = "hello")
     fun hello(): CompletableFuture<String> {
         return Mono.just("Hello Query...!").toFuture()
     }
+
+    @DgsQuery(field = "helloByName")
+    fun helloByName(name: String): CompletableFuture<String> {
+        return Mono.just("Hello $name...!").toFuture()
+    }
 }

src/main/kotlin/com/cubetiqs/graphql/demo/resolver/query/UserQueryResolver.kt

@@ -3,14 +3,15 @@ package com.cubetiqs.graphql.demo.resolver.query
 import com.cubetiqs.graphql.demo.context.GQuery
 import com.cubetiqs.graphql.demo.domain.user.User
 import com.cubetiqs.graphql.demo.repository.UserRepository
-import graphql.kickstart.tools.GraphQLQueryResolver
+import com.netflix.graphql.dgs.DgsQuery
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.data.domain.Pageable
 
 @GQuery
 class UserQueryResolver @Autowired constructor(
     private val userRepository: UserRepository,
-) : GraphQLQueryResolver {
+) {
+    @DgsQuery(field = "fetchUsers")
     fun fetchUsers(): Collection<User> {
         val users = userRepository.queryAllByEnabledIsTrue(Pageable.unpaged())
         return users.content

src/main/kotlin/com/cubetiqs/graphql/demo/resolver/subscription/HelloSubscriptionResolver.kt

@@ -1,14 +1,15 @@
 package com.cubetiqs.graphql.demo.resolver.subscription
 
-import graphql.kickstart.tools.GraphQLSubscriptionResolver
+import com.cubetiqs.graphql.demo.context.GSubscription
+import com.netflix.graphql.dgs.DgsSubscription
 import graphql.schema.DataFetchingEnvironment
 import org.reactivestreams.Publisher
-import org.springframework.stereotype.Service
 import reactor.core.publisher.Flux
 import java.time.Duration
 
-@Service
+@GSubscription
-class HelloSubscriptionResolver : GraphQLSubscriptionResolver {
+class HelloSubscriptionResolver {
+    @DgsSubscription(field = "hello")
     fun hello(env: DataFetchingEnvironment): Publisher<Int> {
         return Flux.range(1, 10).delayElements(Duration.ofSeconds(1))
     }

src/main/resources/application.yml

@@ -17,7 +17,8 @@ spring:
     properties:
       hibernate:
         enable_lazy_load_no_trans: ${HIBERNATE_LAZY_NO_TRANS:true}
-
+  main:
+    allow-bean-definition-overriding: true
 # Spring Boot Actuator
 management:
   endpoints:
@@ -25,15 +26,8 @@ management:
       exposure:
         include: health,info,metrics
 
-# GraphQL Voyager
+# DGS GraphQL
-voyager:
+dgs:
-  enabled: true
-  cdn:
-    enabled: false
-
-# GraphQL Playground
   graphql:
-  playground:
+    graphiql:
       enabled: true
-      cdn:
-        enabled: false

src/main/resources/schema.graphqls

@@ -1,59 +0,0 @@
-enum AccountType {
-    BASIC
-    PREMIUM
-    BUSINESS
-}
-
-enum AccountCurrency {
-    USD
-    KHR
-}
-
-type User {
-    id: ID
-    code: String
-    username: String
-    name: String
-    enabled: Boolean
-}
-
-type Account {
-    id: ID
-    code: String
-    balance: Float
-    currentBalance: Float
-    type: AccountType
-    currency: AccountCurrency
-    user: User!
-}
-
-input UserInput {
-    username: String
-    password: String
-    name: String
-    enabled: Boolean
-}
-
-input AccountInput {
-    userId: Int
-    type: AccountType
-    currency: AccountCurrency
-}
-
-type Query {
-    hello: String
-
-    fetchUsers: [User]!
-
-    fetchAccounts: [Account]!
-}
-
-type Subscription {
-    hello: Int
-}
-
-type Mutation {
-    createUser(input: UserInput): User!
-
-    openAccount(input: AccountInput): Account!
-}

src/main/resources/schema/account.graphql

@@ -0,0 +1,26 @@
+enum AccountType {
+    BASIC
+    PREMIUM
+    BUSINESS
+}
+
+enum AccountCurrency {
+    USD
+    KHR
+}
+
+type Account {
+    id: ID
+    code: String
+    balance: Float
+    currentBalance: Float
+    type: AccountType
+    currency: AccountCurrency
+    user: User!
+}
+
+input AccountInput {
+    userId: Int
+    type: AccountType
+    currency: AccountCurrency
+}

src/main/resources/schema/expense.graphql

@@ -0,0 +1,16 @@
+input ExpenseFilter {
+    isIncome: Boolean
+}
+
+type Expense {
+    id: ID
+    description: String
+    amount: Int
+    isIncome: Boolean
+}
+
+type ExpensePage {
+    list: [Expense]
+    totalPages: Int
+    currentPage: Int
+}

src/main/resources/schema/schema.graphqls

@@ -0,0 +1,21 @@
+type Query {
+    hello: String
+
+    helloByName(name: String!): String
+
+    fetchUsers: [User]!
+
+    fetchAccounts: [Account]!
+
+    fetchExpenses(filter: ExpenseFilter, pageNumber: Int, pageSize: Int) : ExpensePage
+}
+
+type Subscription {
+    hello: Int
+}
+
+type Mutation {
+    createUser(input: UserInput): User!
+
+    openAccount(input: AccountInput): Account!
+}

src/main/resources/schema/user.graphql

@@ -0,0 +1,14 @@
+type User {
+    id: ID
+    code: String
+    username: String
+    name: String
+    enabled: Boolean
+}
+
+input UserInput {
+    username: String
+    password: String
+    name: String
+    enabled: Boolean
+}

src/test/kotlin/com/cubetiqs/graphql/demo/GraphqlDemoApplicationTests.kt

@@ -1,13 +1,55 @@
 package com.cubetiqs.graphql.demo
 
+import com.cubetiqs.graphql.demo.resolver.subscription.HelloSubscriptionResolver
+import com.netflix.graphql.dgs.DgsQueryExecutor
+import com.netflix.graphql.dgs.autoconfig.DgsAutoConfiguration
+import graphql.ExecutionResult
 import org.junit.jupiter.api.Test
+import org.reactivestreams.Publisher
+import org.reactivestreams.Subscriber
+import org.reactivestreams.Subscription
+import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.boot.test.context.SpringBootTest
 
-@SpringBootTest
+@SpringBootTest(
+    classes = [
+        DgsAutoConfiguration::class,
+        HelloSubscriptionResolver::class,
+    ]
+)
 class GraphqlDemoApplicationTests {
+    @Autowired
+    lateinit var dgsQueryExecutor: DgsQueryExecutor
 
     @Test
-	fun contextLoads() {
+    fun helloSubscription() {
+        dgsQueryExecutor.execute(
+            """
+            subscription {
+              hello
+            }
+        """.trimIndent()
+        )
+            .getData<Publisher<ExecutionResult>>()
+            .subscribe(object : Subscriber<ExecutionResult> {
+                override fun onSubscribe(s: Subscription) {
+                    s.request(2)
+                }
+
+                override fun onNext(t: ExecutionResult) {
+                    println(t.getData<Any?>())
+                }
+
+                override fun onError(t: Throwable?) {
+
+                }
+
+                override fun onComplete() {
+                    println("Hello World")
+                }
+            }
+
+            )
     }
 
 }