无法在一个文件中运行多个测试

如何解决无法在一个文件中运行多个测试

我正在构建GraphQL API，并且想通过玩笑来测试一些解析器和数据库。

这是我的帮助文件，其中设置了上下文和Prisma Client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：

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    "}}

另外，当我在单独的文件中运行两个测试时，每进行第二次测试，就会出现此错误：
listen EADDRINUSE: address already in use :::4200

我完成了联系教程（第4步和第5步），他们在其中解释了如何进行测试，但由于某种原因它无法正常工作。所以请帮助我。

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

解决方法

我为相同的Locator Strategies创建了一个具有并行测试的存储库。测试环境设置位于prisma文件夹中，并且在tests文件夹中创建了类似的帮助程序。