systemic-service-runner/test/runner.test.js

Starts systemic systems

const assert = require('assert');
const runner = require('../index');

describe('systemic service runner', () => {
  let system;
  let exit;

  beforeEach(() => {
    system = createSystem();
    exit = process.exit;
  });

  afterEach(() => {
    process.removeAllListeners();
    process.exit = exit;
  });

  it('should start a system', (t, done) => {
    runner(system).start(() => {
      assert(system.started);
      done();
    });
  });

  it('should stop a system', (t, done) => {
    runner(system).stop(() => {
      assert(system.stopped);
      done();
    });
  });

  it('should stop on unhandled error', (t, done) => {
    process.exit = (code) => {
      assert(system.stopped);
      assert.equal(code, 1);
      done();
    };
    const logger = {
      error: (message) => assert.equal(message, 'Unhandled error. Invoking shutdown.'),
    };
    runner(system, { logger }).start(() => {
      assert(system.started);
      setTimeout(() => process.emit('error'));
    });
  });

  it('should stop on unhandled rejection', (t, done) => {
    process.exit = (code) => {
      assert(system.stopped);
      assert.equal(code, 1);
      done();
    };
    const logger = {
      error: (message) => assert.equal(message, 'Unhandled rejection. Invoking shutdown.'),
    };
    runner(system, { logger }).start(() => {
      assert(system.started);
      setTimeout(() => process.emit('unhandledRejection'));
    });
  });

  it('should stop on SIGINT', (t, done) => {
    process.exit = (code) => {
      assert(system.stopped);
      assert.equal(code, 0);
      done();
    };
    const logger = {
      info: (message) => assert.equal(message, 'Received SIGINT. Attempting to shutdown gracefully.'),
    };
    runner(system, { logger }).start(() => {
      assert(system.started);
      setTimeout(() => process.emit('SIGINT'));
    });
  });

  it('should stop on SIGTERM', (t, done) => {
    process.exit = (code) => {
      assert(system.stopped);
      assert.equal(code, 0);
      done();
    };
    var logger = {
      info: (message) => assert.equal(message, 'Received SIGTERM. Attempting to shutdown gracefully.'),
    };
    runner(system, { logger }).start(() => {
      assert(system.started);
      setTimeout(() => process.emit('SIGTERM'));
    });
  });

  function createSystem() {
    return {
      started: false,
      stopped: false,
      restarted: false,
      start: function (cb) {
        this.started = true;
        cb();
      },
      stop: function (cb) {
        this.stopped = true;
        cb();
      },
    };
  }
});