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test-helpers.ts
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test-helpers.ts
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// Copyright IBM Corp. 2020. All Rights Reserved.
// Node module: @loopback/express
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT
import {
Binding,
createProxyWithInterceptors,
intercept,
InterceptorOrKey,
} from '@loopback/core';
import {Client, givenHttpServerConfig, supertest} from '@loopback/testlab';
import bodyParser from 'body-parser';
import {ExpressApplication} from '../../express.application';
import {ExpressRequestHandler} from '../../types';
import {SpyAction, SpyConfig} from '../fixtures/spy-config';
import spyFactory from '../fixtures/spy.middleware';
export const spy = spyFactory;
export {SpyConfig} from '../fixtures/spy-config';
export type TestFunction = (
spyBinding: Binding<unknown>,
path?: string,
) => Promise<unknown>;
export class TestHelper {
readonly app: ExpressApplication;
client: Client;
constructor() {
this.app = new ExpressApplication({
express: {
...givenHttpServerConfig(),
settings: {
env: 'test',
},
},
});
this.app.expressServer.expressMiddleware(
bodyParser.json,
{strict: false},
{key: 'middleware.bodyParser'},
);
}
async start() {
await this.app.start();
this.client = supertest(this.app.expressServer.url);
}
stop() {
return this.app.stop();
}
bindController(interceptor?: InterceptorOrKey) {
const interceptors: InterceptorOrKey[] = [];
if (interceptor) interceptors.push(interceptor);
class MyController {
@intercept(...interceptors)
hello(msg: string) {
return `Hello, ${msg}`;
}
}
const binding = this.app.controller(MyController);
const handler: ExpressRequestHandler = async (req, res, next) => {
try {
const controller = await this.app.get<MyController>(binding.key);
const proxy = createProxyWithInterceptors(
controller,
this.app.expressServer.getMiddlewareContext(req),
undefined,
{
type: 'route',
value: controller,
},
);
res.send(await proxy.hello(req.body));
} catch (err) {
next(err);
}
};
this.app.expressServer.expressApp.post('/hello', handler);
this.app.expressServer.expressApp.post('/greet', handler);
}
private configureSpy(
spyBinding: Binding<unknown>,
action: SpyAction = 'log',
) {
this.app.configure<SpyConfig>(spyBinding.key).to({action});
}
async testSpyLog(spyBinding: Binding<unknown>, path = '/hello') {
this.configureSpy(spyBinding);
await this.assertSpyLog(path);
}
async assertSpyLog(path = '/hello') {
await this.client
.post(path)
.send('"World"')
.set('content-type', 'application/json')
.expect(200, 'Hello, World')
.expect('x-spy-log', `POST ${path}`);
}
async testSpyMock(spyBinding: Binding<unknown>, path = '/hello') {
this.configureSpy(spyBinding, 'mock');
await this.assertSpyMock(path);
}
async assertSpyMock(path = '/hello') {
await this.client
.post(path)
.send('"World"')
.set('content-type', 'application/json')
.expect(200, 'Hello, Spy')
.expect('x-spy-mock', `POST ${path}`);
}
async testSpyReject(spyBinding: Binding<unknown>, path = '/hello') {
this.configureSpy(spyBinding, 'reject');
await this.assertSpyReject(path);
}
private async assertSpyReject(path = '/hello') {
await this.client
.post(path)
.send('"World"')
.set('content-type', 'application/json')
.expect(400)
.expect('x-spy-reject', `POST ${path}`);
}
}