test/handlers/health-check-tests.js

// Copyright (c) 2017, Compiler Explorer Authors
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import express from 'express';
import mockfs from 'mock-fs';

import {CompilationQueue} from '../../lib/compilation-queue.js';
import {HealthCheckHandler} from '../../lib/handlers/health-check.js';
import {chai} from '../utils.js';

describe('Health checks', () => {
    let app;
    let compilationQueue;

    beforeEach(() => {
        compilationQueue = new CompilationQueue(1);
        app = express();
        app.use('/hc', new HealthCheckHandler(compilationQueue).handle);
    });

    it('should respond with OK', async () => {
        const res = await chai.request(app).get('/hc');
        res.should.have.status(200);
        res.text.should.be.eql('Everything is awesome');
    });

    it('should use compilation queue', async () => {
        let count = 0;
        compilationQueue._queue.on('active', () => {
            count++;
        });
        await chai.request(app).get('/hc');
        count.should.be.eql(1);
    });
});

describe('Health checks on disk', () => {
    let app;

    before(() => {
        const compilationQueue = new CompilationQueue(1);

        app = express();
        app.use('/hc', new HealthCheckHandler(compilationQueue, '/fake/.nonexist').handle);
        app.use('/hc2', new HealthCheckHandler(compilationQueue, '/fake/.health').handle);

        mockfs({
            '/fake': {
                '.health': 'Everything is fine',
            },
        });
    });

    after(() => {
        mockfs.restore();
    });

    it('should respond with 500 when file not found', async () => {
        const res = await chai.request(app).get('/hc');
        res.should.have.status(500);
    });

    it('should respond with OK and file contents when found', async () => {
        const res = await chai.request(app).get('/hc2');
        res.should.have.status(200);
        res.text.should.be.eql('Everything is fine');
    });
});