From c6c26611213022a54218918256610f5d4904f492 Mon Sep 17 00:00:00 2001
From: Pierre Ossman <ossman@cendio.se>
Date: Mon, 28 Sep 2020 12:24:56 +0200
Subject: [PATCH] Add workaround for Firefox PNG rounding bug

---
 kasmweb/tests/test.tightpng.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/kasmweb/tests/test.tightpng.js b/kasmweb/tests/test.tightpng.js
index cb36e99..253400b 100644
--- a/kasmweb/tests/test.tightpng.js
+++ b/kasmweb/tests/test.tightpng.js
@@ -128,8 +128,15 @@ describe('TightPng Decoder', function () {
             0x00, 0xff, 0x00, 255, 0x00, 0xff, 0x00, 255, 0xff, 0x00, 0x00, 255, 0xff, 0x00, 0x00, 255
         ]);
 
+        // Firefox currently has some very odd rounding bug:
+        // https://bugzilla.mozilla.org/show_bug.cgi?id=1667747
+        function almost(a, b) {
+            let diff = Math.abs(a - b);
+            return diff < 30;
+        }
+
         display.onflush = () => {
-            expect(display).to.have.displayed(targetData);
+            expect(display).to.have.displayed(targetData, almost);
             done();
         };
         display.flush();