globwatcher/test/lib/test_filewatcher.js

watch a set of files for changes (including create/delete) by glob patterns

"use strict";

var fs = require("fs");
var mocha_sprinkles = require("mocha-sprinkles");
var path = require("path");
var Promise = require("bluebird");
var shell = require("shelljs");
var should = require("should");
var touch = require("touch");
var util = require("util");

require("source-map-support").install();

var future = mocha_sprinkles.future;
var withTempFolder = mocha_sprinkles.withTempFolder;

var FileWatcher = require("../../lib/globwatcher/filewatcher").FileWatcher;

function makeFixtures(folder) {
  var past = Date.now() - 1000;
  ["" + folder + "/one.x", "" + folder + "/sub/one.x", "" + folder + "/sub/two.x", "" + folder + "/nested/three.x", "" + folder + "/nested/weird.jpg"].map(function (file) {
    shell.mkdir("-p", path.dirname(file));
    touch.sync(file, { mtime: past });
  });
}

function fixtures(f) {
  return future(withTempFolder(function (folder) {
    makeFixtures(folder);
    return f(folder);
  }));
}

function withFileWatcher(f) {
  return function () {
    for (var _len = arguments.length, x = Array(_len), _key = 0; _key < _len; _key++) {
      x[_key] = arguments[_key];
    }

    var watcher = new FileWatcher();
    return f.apply(undefined, [watcher].concat(x))["finally"](function () {
      return watcher.close();
    });
  };
}

describe("FileWatcher", function () {
  it("creates a watch", fixtures(withFileWatcher(function (watcher, folder) {
    (watcher.timer == null).should.eql(true);
    var watch = watcher.watch("" + folder + "/one.x");
    (watch != null).should.eql(true);
    (watcher.timer != null).should.eql(true);
    return Promise.resolve();
  })));

  it("reuses the same watch for the same filename", fixtures(withFileWatcher(function (watcher, folder) {
    var watch1 = watcher.watch("" + folder + "/one.x");
    var watch2 = watcher.watch("" + folder + "/one.x");
    watch1.should.equal(watch2);
    return Promise.resolve();
  })));

  it("notices a change", fixtures(withFileWatcher(function (watcher, folder) {
    var watch = watcher.watch("" + folder + "/one.x");
    var count = 0;
    watch.on("changed", function () {
      return count += 1;
    });
    touch.sync("" + folder + "/one.x");
    count.should.eql(0);
    return watch.check().then(function () {
      count.should.eql(1);
    });
  })));

  it("notices several changes at once", fixtures(withFileWatcher(function (watcher, folder) {
    var countOne = 0;
    var countTwo = 0;
    watcher.watch("" + folder + "/sub/one.x").on("changed", function () {
      return countOne += 1;
    });
    watcher.watch("" + folder + "/sub/two.x").on("changed", function () {
      return countTwo += 1;
    });
    touch.sync("" + folder + "/sub/one.x");
    touch.sync("" + folder + "/sub/two.x");
    countOne.should.eql(0);
    countTwo.should.eql(0);
    return watcher.check().then(function () {
      countOne.should.eql(1);
      countTwo.should.eql(1);
    });
  })));

  it("notices changes on a timer", fixtures(withFileWatcher(function (watcher, folder) {
    var countOne = 0;
    var countTwo = 0;
    watcher.watch("" + folder + "/sub/one.x").on("changed", function () {
      return countOne += 1;
    });
    watcher.watch("" + folder + "/sub/two.x").on("changed", function () {
      return countTwo += 1;
    });
    touch.sync("" + folder + "/sub/one.x");
    touch.sync("" + folder + "/sub/two.x");
    countOne.should.eql(0);
    countTwo.should.eql(0);
    return Promise.delay(watcher.period + 10).then(function () {
      countOne.should.eql(1);
      countTwo.should.eql(1);
    });
  })));

  it("queues stacked check() calls", fixtures(withFileWatcher(function (watcher, folder) {
    var count = 0;
    watcher.watch("" + folder + "/one.x").on("changed", function () {
      return count += 1;
    });
    touch.sync("" + folder + "/one.x", { mtime: Date.now() + 1000 });
    var visited = [false, false];
    var x1 = watcher.check().then(function () {
      count.should.eql(1);
      touch.sync("" + folder + "/one.x", { mtime: Date.now() + 2000 });
      visited[1].should.eql(false);
      visited[0] = true;
    });
    var x2 = watcher.check().then(function () {
      visited[0].should.eql(true);
      visited[1] = true;
      count.should.eql(2);
    });
    visited[0].should.eql(false);
    visited[1].should.eql(false);
    return Promise.all([x1, x2]);
  })));

  it("detects size changes", future(withTempFolder(withFileWatcher(function (watcher, folder) {
    var now = Date.now() - 15000;
    var write = function (data) {
      fs.writeFileSync("" + folder + "/shifty.x", data);
      touch.sync("" + folder + "/shifty.x", { mtime: now });
    };
    write("abcdefghij");
    var count = 0;
    watcher.watch("" + folder + "/shifty.x").on("changed", function () {
      return count += 1;
    });
    write("klmnopqrst");
    return watcher.check().then(function () {
      count.should.eql(0);
      write("abcdef");
      return watcher.check();
    }).then(function () {
      count.should.eql(1);
    });
  }))));

  it("can unwatch", future(withTempFolder(withFileWatcher(function (watcher, folder) {
    touch.sync("" + folder + "/changes.x", { mtime: Date.now() - 15000 });
    var watch = watcher.watch("" + folder + "/changes.x");
    var count = 0;
    watch.on("changed", function () {
      return count += 1;
    });
    touch.sync("" + folder + "/changes.x", { mtime: Date.now() - 11000 });
    return watcher.check().then(function () {
      count.should.eql(1);
      watcher.unwatch("" + folder + "/changes.x");
      touch.sync("" + folder + "/changes.x", { mtime: Date.now() - 6000 });
      return watcher.check();
    }).then(function () {
      count.should.eql(1);
    });
  }))));
});
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