From e1ef779d4ebd0f13b4dfe51ab91c277a6e3ca183 Mon Sep 17 00:00:00 2001
From: abe33 <cedric.nehemie@gmail.com>
Date: Tue, 10 Mar 2015 12:17:25 +0100
Subject: [PATCH] :green_heart: Fix random failures in scroll tests

---
 lib/minimap-element.coffee       | 28 ++++++++++++++++------------
 spec/minimap-element-spec.coffee | 22 ++++++++++++++++------
 2 files changed, 32 insertions(+), 18 deletions(-)

diff --git a/lib/minimap-element.coffee b/lib/minimap-element.coffee
index 8df431fe..c7620d3d 100644
--- a/lib/minimap-element.coffee
+++ b/lib/minimap-element.coffee
@@ -365,18 +365,18 @@ class MinimapElement extends HTMLElement
     y = pageY - target.getBoundingClientRect().top
     row = Math.floor(y / @minimap.getLineHeight()) + @minimap.getFirstVisibleScreenRow()
 
-    scrollTop = row * @minimap.textEditor.getLineHeightInPixels() - @minimap.textEditor.getHeight() / 2
+    textEditor = @minimap.getTextEditor()
+
+    scrollTop = row * textEditor.getLineHeightInPixels() - textEditor.getHeight() / 2
 
-    from = @minimap.textEditor.getScrollTop()
-    to = scrollTop
-    step = (now) =>
-      @minimap.textEditor.setScrollTop(now)
     if atom.config.get('minimap.scrollAnimation')
       duration = 300
+      from = textEditor.getScrollTop()
+      to = scrollTop
+      step = (now) => textEditor.setScrollTop(now)
+      @animate(from: from, to: to, duration: duration, step: step)
     else
-      duration = 0
-
-    @animate(from: from, to: to, duration: duration, step: step)
+      textEditor.setScrollTop(scrollTop)
 
   relayMousewheelEvent: (e) =>
     editorElement = atom.views.getView(@minimap.textEditor)
@@ -451,14 +451,16 @@ class MinimapElement extends HTMLElement
     else
       "scale(#{x}, #{y})"
 
+  getTime: -> new Date()
+
   animate: ({from, to, duration, step}) ->
-    start = new Date()
+    start = @getTime()
 
     swing = (progress) ->
       return 0.5 - Math.cos( progress * Math.PI ) / 2
 
-    update = ->
-      passed = new Date() - start
+    update = =>
+      passed = @getTime() - start
       if duration == 0
         progress = 1
       else
@@ -466,7 +468,9 @@ class MinimapElement extends HTMLElement
       progress = 1 if progress > 1
       delta = swing(progress)
       step(from + (to-from)*delta)
-      requestAnimationFrame(update) if progress < 1
+
+      if progress < 1
+        requestAnimationFrame(update)
 
     update()
 
diff --git a/spec/minimap-element-spec.coffee b/spec/minimap-element-spec.coffee
index a2278936..603b5551 100644
--- a/spec/minimap-element-spec.coffee
+++ b/spec/minimap-element-spec.coffee
@@ -70,7 +70,7 @@ describe 'MinimapElement', ->
   #    ##     ##    ##       ##    ##     ##  ######  ##     ##
 
   describe 'when attached to the text editor element', ->
-    [noAnimationFrame, nextAnimationFrame, canvas, visibleArea] = []
+    [noAnimationFrame, nextAnimationFrame, lastFn, canvas, visibleArea] = []
 
     beforeEach ->
       # Comment after body below to leave the created text editor and minimap
@@ -82,6 +82,7 @@ describe 'MinimapElement', ->
 
       requestAnimationFrameSafe = window.requestAnimationFrame
       spyOn(window, 'requestAnimationFrame').andCallFake (fn) ->
+        lastFn = fn
         nextAnimationFrame = ->
           nextAnimationFrame = noAnimationFrame
           fn()
@@ -284,8 +285,8 @@ describe 'MinimapElement', ->
         editor.setScrollTop(0)
         editor.setScrollLeft(0)
 
-        sleep(150)
-        runs -> nextAnimationFrame()
+        minimapElement.measureHeightAndWidth()
+        nextAnimationFrame()
 
       describe 'using the mouse scrollwheel over the minimap', ->
         beforeEach ->
@@ -298,22 +299,31 @@ describe 'MinimapElement', ->
 
       describe 'pressing the mouse on the minimap canvas (without scroll animation)', ->
         beforeEach ->
+          t = 0
+          spyOn(minimapElement, 'getTime').andCallFake -> n = t; t += 100; n
+          spyOn(minimapElement, 'requestUpdate').andCallFake ->
+
           atom.config.set 'minimap.scrollAnimation', false
+
           canvas = minimapElement.canvas
           mousedown(canvas)
-          waitsFor -> nextAnimationFrame isnt noAnimationFrame
-          runs -> nextAnimationFrame()
 
         it 'scrolls the editor to the line below the mouse', ->
           expect(editor.getScrollTop()).toEqual(360)
 
       describe 'pressing the mouse on the minimap canvas (with scroll animation)', ->
         beforeEach ->
-          expect(editor.getScrollTop()).toEqual(0)
+
+          t = 0
+          spyOn(minimapElement, 'getTime').andCallFake -> n = t; t += 100; n
+          spyOn(minimapElement, 'requestUpdate').andCallFake ->
 
           atom.config.set 'minimap.scrollAnimation', true
+          atom.config.set 'minimap.scrollAnimationDuration', 300
+
           canvas = minimapElement.canvas
           mousedown(canvas)
+
           waitsFor -> nextAnimationFrame isnt noAnimationFrame
 
         it 'scrolls the editor gradually to the line below the mouse', ->