FilesizeWatcherSpec.js

'use strict';

var FilesizeWatcher = require('../src/FilesizeWatcher');
var exec = require("child_process").exec;

describe('FilesizeWatcher', function() {

  var watcher;

  afterEach(function() {
    watcher.stop();
  });

  it('should fire a "grew" event when the field grew in size', function(done) {

    var path = '/var/tmp/filesizewatcher.test';
    exec('rm -f ' + path + ' ; touch ' + path, function() {
      watcher = new FilesizeWatcher(path);

      watcher.on('grew', function(gain) {
        expect(gain).toBe(5);
        done();
      });

      exec('echo "test" > ' + path, function() {});

    });
  });

  it('should fire a "shrank" event when the file grew in size', function(done) {

    var path = '/var/tmp/filesizewatcher.test';
    exec('rm -f ' + path + ' ; touch ' + path, function() {
      watcher = new FilesizeWatcher(path);

      watcher.on('shrank', function(loss) {
        expect(loss).toBe(3);
        done();
      });

      exec('echo "a" > ' + path, function() {});
    });
  });

  it('should fire "error" if path does not start with a slash', function(done) {

    var path = 'var/tmp/filesizewatcher.test';
    watcher = new FilesizeWatcher(path);

    watcher.on('error', function(err) {
      expect(err).toBe('Path does not start with a slash');
      done();
    });
  });
});