不能在一个文件中运行多个测试

Posted 2023-03-08

【中文标题】不能在一个文件中运行多个测试

【英文标题】：Can not run multiple tests in a file

【发布时间】：2021-02-24 14:02:30

【问题描述】：

我正在构建一个 GraphQL API，我想开玩笑地测试一些解析器和数据库。

这是我的帮助文件，我在其中设置上下文和 Prisma 客户端以进行测试。

import  PrismaClient  from "@prisma/client";
import  ServerInfo  from "apollo-server";
import  execSync  from "child_process";
import getPort,  makeRange  from "get-port";
import  GraphQLClient  from "graphql-request";
import  nanoid  from "nanoid";
import  join  from "path";
import  Client  from "pg";
import  server  from "../api/server";

type TestContext = 
  client: GraphQLClient;
  db: PrismaClient;
;

export function createTestContext(): TestContext 
  let ctx =  as TestContext;
  const graphqlCtx = graphqlTestContext();
  const prismaCtx = prismaTestContext();

  beforeEach(async () => 
    const client = await graphqlCtx.before();
    const db = await prismaCtx.before();

    Object.assign(ctx, 
      client,
      db,
    );
  );

  afterEach(async () => 
    await graphqlCtx.after();
    await prismaCtx.after();
  );

  return ctx;


function graphqlTestContext() 
  let serverInstance: ServerInfo | null = null;

  return 
    async before() 
      const port = await getPort( port: makeRange(4000, 6000) );
      serverInstance = await server.listen( port );

      return new GraphQLClient(`http://localhost:$port`);
    ,
    async after() 
      serverInstance?.server.close();
    ,
  ;


function prismaTestContext() 
  const prismaBinary = join(__dirname, "..", "node_modules", ".bin", "prisma");
  let schema = "";
  let databaseUrl = "";
  let prismaClient: null | PrismaClient = null;

  return 
    async before() 
      schema = `test_$nanoid()`;
      databaseUrl = `postgresql://user:123@localhost:5432/testing?schema=$schema`;

      process.env.DATABASE_URL = databaseUrl;

      execSync(`$prismaBinary migrate up --create-db --experimental`, 
        env: 
          ...process.env,
          DATABASE_URL: databaseUrl,
        ,
      );

      prismaClient = new PrismaClient();

      return prismaClient;
    ,
    async after() 
      const client = new Client(
        connectionString: databaseUrl,
      );
      await client.connect();
      await client.query(`DROP SCHEMA IF EXISTS "$schema" CASCADE`);
      await client.end();

      await prismaClient?.$disconnect();
    ,
  ;

我的测试文件如下所示：

import  createTestContext  from "./__helpers";

const ctx = createTestContext();

it("register user", async () => 
  const testUser = 
    username: "Test",
    email: "[e-mail]",
    password: "password",
  ;
  const registerResult = await ctx.client.request(
    `
    mutation registerNewUser($username: String!, $email: String!, $password: String!) 
      register(username: $username, email: $email, password: $password) 
        user 
          user_id
          username
          email
        
      
    
  `,
    
      username: testUser.username,
      email: testUser.email,
      password: testUser.password,
    
  );

  const resultUsername = registerResult.register.user.username;
  const resultEmail = registerResult.register.user.email;
  const resultUserID = registerResult.register.user.user_id;

  expect(resultUsername).toBe(testUser.username);
  expect(resultEmail).toBe(testUser.email);
  expect(resultUserID).not.toBeNull;

  const users = await ctx.db.user.findMany();
  const savedUser = users[0];

  expect(savedUser.username).toBe(testUser.username);
  expect(savedUser.email).toBe(testUser.email);
  expect(savedUser.user_id).toBe(resultUserID);
  expect(savedUser.first_name).toBeNull;
  expect(savedUser.last_name).toBeNull;
  expect(savedUser.role).toBe("USER");
  expect(savedUser.password).not.toBe(testUser.password);
);

it("all events", async () => 
  const eventsResult = await ctx.client.request(
    `
    query 
      allEvents 
        event_id
        title
        description
      
    
    `
  );

  expect(eventsResult.allEvents.length).toBe(0)
);

当我只运行一个包含一个测试的文件时，一切正常。但是当我在一个文件中运行多个测试时，第一个运行正常，但之后的运行不正常。我收到此错误：

The table `test_LjrcmbMjI4vLaDYM9-lvw.Event` does not exist in the current database.: "response":"errors":["message":"\nInvalid `prisma.event.findMany()` invocation:\n\n\n  The table `test_LjrcmbMjI4vLaDYM9-lvw.Event` does not exist in the current database.","locations":["line":3,"column":7],"path":["allEvents"],"extensions":"code":"INTERNAL_SERVER_ERROR","exception":"code":"P2021","clientVersion":"2.11.0","meta":"table":"test_LjrcmbMjI4vLaDYM9-lvw.Event"],"data":null,"status":200,"request":"query":"\n    query \n      allEvents \n        event_id\n        title\n        description\n      \n    \n    "

此外，当我在单独的文件中运行两个测试时，在每第二次测试运行时我都会收到此错误：listen EADDRINUSE: address already in use :::4200

我完成了 nexus 教程（第 4 步和第 5 步），他们解释了如何进行测试，但不知何故它不起作用。所以请帮助我。

https://nexusjs.org/docs/getting-started/tutorial

【参考方案1】：

我为相同的here 创建了一个包含并行测试的存储库。测试环境设置在prisma 文件夹中，在tests 文件夹中创建了一个类似的帮助程序。

【讨论】：

这对我没有帮助，因为您使用的是 SQLite 数据库而不是 Postgres 数据库。

这里是 one 和 Postgres。思路是一样的，只是我这里用的是自省，你可以用我的 SQLite 例子中的 Migrate 命令替换那些。