From e0ef4eabc00892a14e25f79a0f9c5bbcd7b52598 Mon Sep 17 00:00:00 2001
From: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Date: Fri, 24 Jun 2016 14:42:31 +0200
Subject: [PATCH] test: add tests for ensuring proper timer delays

Includes a passing test that should keep passing and an issue test to
be fixed.

Refs: https://github.com/nodejs/node/issues/5426
Refs: https://github.com/nodejs/node/issues/7346
Refs: https://github.com/nodejs/node/issues/7386
---
 .../test-timers-sync-work-delay-problem.js    | 32 +++++++++++++++++++
 .../test-timers-later-scheduled-delay.js      | 18 +++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 test/known_issues/test-timers-sync-work-delay-problem.js
 create mode 100644 test/parallel/test-timers-later-scheduled-delay.js

diff --git a/test/known_issues/test-timers-sync-work-delay-problem.js b/test/known_issues/test-timers-sync-work-delay-problem.js
new file mode 100644
index 00000000000000..3181588e5d4b97
--- /dev/null
+++ b/test/known_issues/test-timers-sync-work-delay-problem.js
@@ -0,0 +1,32 @@
+'use strict';
+
+// See https://github.com/nodejs/node/issues/5426
+
+const common = require('../common');
+const TimerWrap = process.binding('timer_wrap').Timer;
+
+function sleep(duration) {
+  var start = Date.now();
+  while ((Date.now() - start) < duration) {
+    for (var i = 0; i < 1e5;) i++;
+  }
+}
+
+var last = TimerWrap.now();
+var count = 0;
+
+const interval = setInterval(common.mustCall(repeat, 4), 500);
+
+function repeat() {
+  if (++count === 4) {
+    clearInterval(interval);
+  }
+  const now = TimerWrap.now();
+
+  if (now < last + 500 - 200 || now > last + 500 + 200) {
+    common.fail(`\`repeat\` delay: ${count} (now: ${now}, last: ${last})\n` +
+                'is not within the margin of error.');
+  }
+  last = now;
+  sleep(500);
+}
diff --git a/test/parallel/test-timers-later-scheduled-delay.js b/test/parallel/test-timers-later-scheduled-delay.js
new file mode 100644
index 00000000000000..97bd3650996f0b
--- /dev/null
+++ b/test/parallel/test-timers-later-scheduled-delay.js
@@ -0,0 +1,18 @@
+'use strict';
+
+// See https://github.com/nodejs/node/issues/5426#issuecomment-228294811
+
+const common = require('../common');
+const TimerWrap = process.binding('timer_wrap').Timer;
+
+setTimeout(common.mustCall(function first() {}), 1000);
+
+setTimeout(function scheduleLast() {
+  setTimeout(common.mustCall(function last() {
+    const now = TimerWrap.now();
+
+    if (now < 1500 - 200 || now > 1500 + 200) {
+      common.fail('Delay for `last` is not within the margin of error.');
+    }
+  }), 1000);
+}, 500);