From 1e80e59614a748d35607dd63ac994ae99eb061e2 Mon Sep 17 00:00:00 2001
From: Alex Barstow <alexander.barstow@gmail.com>
Date: Fri, 14 Jul 2017 14:20:37 -0400
Subject: [PATCH] test: add unit tests for player.duration() (#4459)

Unit tests for https://github.com/videojs/video.js/pull/4443
---
 test/unit/player.test.js | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/test/unit/player.test.js b/test/unit/player.test.js
index 328637ad44..4723378054 100644
--- a/test/unit/player.test.js
+++ b/test/unit/player.test.js
@@ -1655,3 +1655,31 @@ QUnit.test('should add a class with major version', function(assert) {
 
   player.dispose();
 });
+
+QUnit.test('player.duration() returns NaN if player.cache_.duration is undefined', function(assert) {
+  const player = TestHelpers.makePlayer();
+
+  player.cache_.duration = undefined;
+  assert.ok(Number.isNaN(player.duration()), 'returned NaN for unkown duration');
+});
+
+QUnit.test('player.duration() returns player.cache_.duration if it is defined', function(assert) {
+  const player = TestHelpers.makePlayer();
+
+  player.cache_.duration = 200;
+  assert.equal(player.duration(), 200, 'returned correct integer duration');
+  player.cache_.duration = 942;
+  assert.equal(player.duration(), 942, 'returned correct integer duration');
+});
+
+QUnit.test('player.duration() sets the value of player.cache_.duration', function(assert) {
+  const player = TestHelpers.makePlayer();
+
+  // set an arbitrary initial cached duration value for testing the setter functionality
+  player.cache_.duration = 1;
+
+  player.duration(NaN);
+  assert.ok(Number.isNaN(player.duration()), 'duration() set and get NaN duration value');
+  player.duration(200);
+  assert.equal(player.duration(), 200, 'duration() set and get integer duration value');
+});