zurvan/tests/TimeoutSettingTests.js

A library for simulating time in Node.js

'use strict';
var assert = require('assert');
var zurvan = require('../zurvan');

describe('zurvan', function() {
  describe('after intercepting timers (more sophisticated usage)', function() {
    beforeEach(function() {
      return zurvan.interceptTimers();
    });
    afterEach(function() {
      return zurvan.releaseTimers();
    });

    it('rejects attempt to move time backwards', function(done) {
      zurvan.advanceTime(-1).catch(function(err) {
        done();
      });
    });

    it('does not expire timeout before time is advanced far enough', function(done) {
      var called = false;
      setTimeout(function() {
        called = true;
      }, 100);
      zurvan
        .advanceTime(50)
        .then(function() {
          assert(!called);
          return zurvan.advanceTime(50);
        })
        .then(function() {
          assert(called);
        })
        .then(done, done);
    });

    it('can pass arguments to timers', function(done) {
      var calls = [];

      setTimeout(
        function(a, b) {
          calls.push(a);
          calls.push(b);
        },
        50,
        2,
        5
      );

      setTimeout(function() {
        calls.push(10);
      }, 1050);

      zurvan
        .advanceTime(50)
        .then(function() {
          assert.deepEqual(calls, [2, 5]);
          return zurvan.advanceTime(1000);
        })
        .then(function() {
          assert.deepEqual(calls, [2, 5, 10]);
        })
        .then(done, done);
    });

    it('executes async callbacks in order of dueTime, even if timeouts are nested', function(done) {
      var calls = [];
      setTimeout(function() {
        calls.push(1);
        setTimeout(calls.push.bind(calls, 2), 50);
      }, 50);

      setTimeout(function() {
        calls.push(100);
      }, 150);

      zurvan
        .advanceTime(150)
        .then(function() {
          assert.deepEqual(calls, [1, 2, 100]);
        })
        .then(done, done);
    });

    it('executes async callbacks after all immediates (macroqueue) are cleared', function(done) {
      var calls = [];
      setTimeout(function() {
        calls.push(1);

        setImmediate(function() {
          calls.push(2);
          setImmediate(calls.push.bind(calls, 3));
        });
      }, 50);

      setTimeout(
        function(a) {
          calls.push(a);
        },
        100,
        12
      );

      zurvan
        .advanceTime(100)
        .then(function() {
          assert.deepEqual(calls, [1, 2, 3, 12]);
        })
        .then(done, done);
    });

    it('throws when time is advanced from two places simultaneously', function(done) {
      setTimeout(function() {
        zurvan.advanceTime(100).catch(function(err) {
          done();
        });
      }, 50);

      zurvan.advanceTime(100);
    });

    it('takes into account setTimeouts in setImmediates when forwarding time', function(done) {
      var calls = [];
      setImmediate(function() {
        calls.push(1);
        setTimeout(calls.push.bind(calls, 2), 50);
      });

      setTimeout(function() {
        calls.push(3);
      }, 100);

      zurvan
        .advanceTime(100)
        .then(function() {
          assert.deepEqual([1, 2, 3], calls);
        })
        .then(done, done);
    });

    it('takes into account setTimeout in process.nextTick when forwarding time', function(done) {
      var calls = [];
      process.nextTick(function() {
        calls.push(1);
        setTimeout(calls.push.bind(calls, 2), 10);
      });

      setTimeout(function() {
        calls.push(10);
      }, 20);

      zurvan
        .advanceTime(20)
        .then(function() {
          assert.deepEqual([1, 2, 10], calls);
        })
        .then(done, done);
    });
  });
});