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fix flaky tests
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@robrichard
robrichard committed Dec 10, 2020
1 parent 633ca8b commit 213d365
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Showing 4 changed files with 306 additions and 116 deletions.
255 changes: 146 additions & 109 deletions src/__tests__/http-test.ts
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Original file line number Diff line number Diff line change
@@ -1,13 +1,18 @@
import zlib from 'zlib';
import type http from 'http';
import http from 'http';
import type { AddressInfo } from 'net';

import type { Server as Restify } from 'restify';
import connect from 'connect';
import express from 'express';
import supertest from 'supertest';
import bodyParser from 'body-parser';

import type { ASTVisitor, ValidationContext } from 'graphql';
import type {
ASTVisitor,
ValidationContext,
AsyncExecutionResult,
} from 'graphql';
import sinon from 'sinon';
import multer from 'multer'; // cSpell:words mimetype originalname
import { expect } from 'chai';
Expand All @@ -28,8 +33,11 @@ import {
import { graphqlHTTP } from '../index';
import { isAsyncIterable } from '../isAsyncIterable';

import SimplePubSub from './simplePubSub';

type Middleware = (req: any, res: any, next: () => void) => unknown;
type Server = () => {
listener: http.Server | http.RequestListener;
request: () => supertest.SuperTest<supertest.Test>;
use: (middleware: Middleware) => unknown;
get: (path: string, middleware: Middleware) => unknown;
Expand Down Expand Up @@ -82,10 +90,51 @@ function urlString(urlParams?: { [param: string]: string }): string {
return string;
}

function sleep(ms = 1) {
return new Promise((r) => {
setTimeout(r, ms);
async function streamRequest(
server: Server,
customExecuteFn?: () => AsyncIterable<AsyncExecutionResult>,
): Promise<{
req: http.ClientRequest;
responseStream: http.IncomingMessage;
}> {
const app = server();
app.get(
urlString(),
graphqlHTTP(() => ({
schema: TestSchema,
customExecuteFn,
})),
);

let httpServer: http.Server;
if (typeof app.listener === 'function') {
httpServer = http.createServer(app.listener);
} else {
httpServer = app.listener;
}
await new Promise((resolve) => {
httpServer.listen(resolve);
});

const addr = httpServer.address() as AddressInfo;
const req = http.get({
method: 'GET',
path: urlString({ query: '{test}' }),
port: addr.port,
});

const res: http.IncomingMessage = await new Promise((resolve) => {
req.on('response', resolve);
});

req.on('close', () => {
httpServer.close();
});

return {
req,
responseStream: res,
};
}

describe('GraphQL-HTTP tests for connect', () => {
Expand All @@ -99,6 +148,7 @@ describe('GraphQL-HTTP tests for connect', () => {
});

return {
listener: app,
request: () => supertest(app),
use: app.use.bind(app),
// Connect only likes using app.use.
Expand All @@ -123,6 +173,7 @@ describe('GraphQL-HTTP tests for express', () => {
});

return {
listener: app,
request: () => supertest(app),
use: app.use.bind(app),
get: app.get.bind(app),
Expand All @@ -148,6 +199,7 @@ describe('GraphQL-HTTP tests for restify', () => {
});

return {
listener: app.server,
request: () => supertest(app),
use: app.use.bind(app),
get: app.get.bind(app),
Expand Down Expand Up @@ -2406,8 +2458,8 @@ function runTests(server: Server) {
urlString(),
graphqlHTTP(() => ({
schema: TestSchema,
// eslint-disable-next-line @typescript-eslint/require-await
async *customExecuteFn() {
await sleep();
yield {
data: {
test2: 'Modification',
Expand Down Expand Up @@ -2450,132 +2502,117 @@ function runTests(server: Server) {
});

it('calls return on underlying async iterable when connection is closed', async () => {
const app = server();
const fakeReturn = sinon.fake();
const executePubSub = new SimplePubSub<AsyncExecutionResult>();
const executeIterable = executePubSub.getSubscriber();
const spy = sinon.spy(executeIterable[Symbol.asyncIterator](), 'return');
expect(
executePubSub.emit({ data: { test: 'Hello, World 1' }, hasNext: true }),
).to.equal(true);

app.get(
urlString(),
graphqlHTTP(() => ({
schema: TestSchema,
// custom iterable keeps yielding until return is called
customExecuteFn() {
let returned = false;
return {
[Symbol.asyncIterator]: () => ({
next: async () => {
await sleep();
if (returned) {
return { value: undefined, done: true };
}
return {
value: { data: { test: 'Hello, World' }, hasNext: true },
done: false,
};
},
return: () => {
returned = true;
fakeReturn();
return Promise.resolve({ value: undefined, done: true });
},
}),
};
},
})),
const { req, responseStream } = await streamRequest(
server,
() => executeIterable,
);
const iterator = responseStream[Symbol.asyncIterator]();

let text = '';
const request = app
.request()
.get(urlString({ query: '{test}' }))
.parse((res, cb) => {
res.on('data', (data) => {
text = `${text}${data.toString('utf8') as string}`;
((res as unknown) as http.IncomingMessage).destroy();
cb(new Error('Aborted connection'), null);
});
});

try {
await request;
} catch (e: unknown) {
// ignore aborted error
}
// sleep to allow time for return function to be called
await sleep(2);
expect(text).to.equal(
const { value: firstResponse } = await iterator.next();
expect(firstResponse.toString('utf8')).to.equal(
[
'\r\n---',
'Content-Type: application/json; charset=utf-8',
'',
'---',
'{"data":{"test":"Hello, World 1"},"hasNext":true}',
'---\r\n',
].join('\r\n'),
);

expect(
executePubSub.emit({ data: { test: 'Hello, World 2' }, hasNext: true }),
).to.equal(true);
const { value: secondResponse } = await iterator.next();
expect(secondResponse.toString('utf8')).to.equal(
[
'Content-Type: application/json; charset=utf-8',
'',
'{"data":{"test":"Hello, World"},"hasNext":true}',
'{"data":{"test":"Hello, World 2"},"hasNext":true}',
'---\r\n',
].join('\r\n'),
);
expect(fakeReturn.callCount).to.equal(1);

req.destroy();

// wait for server to call return on underlying iterable
await executeIterable.next();

expect(spy.calledOnce).to.equal(true);
// emit returns false because `return` cleaned up subscribers
expect(
executePubSub.emit({ data: { test: 'Hello, World 3' }, hasNext: true }),
).to.equal(false);
});

it('handles return function on async iterable that throws', async () => {
const app = server();
const executePubSub = new SimplePubSub<AsyncExecutionResult>();
const executeIterable = executePubSub.getSubscriber();
const executeIterator = executeIterable[Symbol.asyncIterator]();
const originalReturn = executeIterator.return.bind(executeIterator);
const fake = sinon.fake(async () => {
await originalReturn();
throw new Error('Throws!');
});
sinon.replace(executeIterator, 'return', fake);
expect(
executePubSub.emit({
data: { test: 'Hello, World 1' },
hasNext: true,
}),
).to.equal(true);

app.get(
urlString(),
graphqlHTTP(() => ({
schema: TestSchema,
// custom iterable keeps yielding until return is called
customExecuteFn() {
let returned = false;
return {
[Symbol.asyncIterator]: () => ({
next: async () => {
await sleep();
if (returned) {
return { value: undefined, done: true };
}
return {
value: { data: { test: 'Hello, World' }, hasNext: true },
done: false,
};
},
return: () => {
returned = true;
return Promise.reject(new Error('Throws!'));
},
}),
};
},
})),
const { req, responseStream } = await streamRequest(
server,
() => executeIterable,
);
const iterator = responseStream[Symbol.asyncIterator]();

let text = '';
const request = app
.request()
.get(urlString({ query: '{test}' }))
.parse((res, cb) => {
res.on('data', (data) => {
text = `${text}${data.toString('utf8') as string}`;
((res as unknown) as http.IncomingMessage).destroy();
cb(new Error('Aborted connection'), null);
});
});

try {
await request;
} catch (e: unknown) {
// ignore aborted error
}
// sleep to allow return function to be called
await sleep(2);
expect(text).to.equal(
const { value: firstResponse } = await iterator.next();
expect(firstResponse.toString('utf8')).to.equal(
[
'\r\n---',
'Content-Type: application/json; charset=utf-8',
'',
'---',
'{"data":{"test":"Hello, World 1"},"hasNext":true}',
'---\r\n',
].join('\r\n'),
);

expect(
executePubSub.emit({
data: { test: 'Hello, World 2' },
hasNext: true,
}),
).to.equal(true);
const { value: secondResponse } = await iterator.next();
expect(secondResponse.toString('utf8')).to.equal(
[
'Content-Type: application/json; charset=utf-8',
'',
'{"data":{"test":"Hello, World"},"hasNext":true}',
'{"data":{"test":"Hello, World 2"},"hasNext":true}',
'---\r\n',
].join('\r\n'),
);
req.destroy();

// wait for server to call return on underlying iterable
await executeIterable.next();

expect(fake.calledOnce).to.equal(true);
// emit returns false because `return` cleaned up subscribers
expect(
executePubSub.emit({
data: { test: 'Hello, World 3' },
hasNext: true,
}),
).to.equal(false);
});
});

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