diff -r 000000000000 -r 6474c204b198 browser/devtools/shared/test/browser_spectrum.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/shared/test/browser_spectrum.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,122 @@
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Tests that the spectrum color picker works correctly
+
+const TEST_URI = "chrome://browser/content/devtools/spectrum-frame.xhtml";
+const {Spectrum} = devtools.require("devtools/shared/widgets/Spectrum");
+
+let doc;
+
+function test() {
+  waitForExplicitFinish();
+  addTab(TEST_URI, () => {
+    doc = content.document;
+    startTests();
+  });
+}
+
+function endTests() {
+  doc = null;
+  gBrowser.removeCurrentTab();
+  finish();
+}
+
+function startTests() {
+  testCreateAndDestroyShouldAppendAndRemoveElements();
+}
+
+function testCreateAndDestroyShouldAppendAndRemoveElements() {
+  let containerElement = doc.querySelector("#spectrum");
+  ok(containerElement, "We have the root node to append spectrum to");
+  is(containerElement.childElementCount, 0, "Root node is empty");
+
+  let s = new Spectrum(containerElement, [255, 126, 255, 1]);
+  s.show();
+  ok(containerElement.childElementCount > 0, "Spectrum has appended elements");
+
+  s.destroy();
+  is(containerElement.childElementCount, 0, "Destroying spectrum removed all nodes");
+
+  testPassingAColorAtInitShouldSetThatColor();
+}
+
+function testPassingAColorAtInitShouldSetThatColor() {
+  let initRgba = [255, 126, 255, 1];
+
+  let s = new Spectrum(doc.querySelector("#spectrum"), initRgba);
+  s.show();
+
+  let setRgba = s.rgb;
+
+  is(initRgba[0], setRgba[0], "Spectrum initialized with the right color");
+  is(initRgba[1], setRgba[1], "Spectrum initialized with the right color");
+  is(initRgba[2], setRgba[2], "Spectrum initialized with the right color");
+  is(initRgba[3], setRgba[3], "Spectrum initialized with the right color");
+
+  s.destroy();
+  testSettingAndGettingANewColor();
+}
+
+function testSettingAndGettingANewColor() {
+  let s = new Spectrum(doc.querySelector("#spectrum"), [0, 0, 0, 1]);
+  s.show();
+
+  let colorToSet = [255, 255, 255, 1];
+  s.rgb = colorToSet;
+  let newColor = s.rgb;
+
+  is(colorToSet[0], newColor[0], "Spectrum set with the right color");
+  is(colorToSet[1], newColor[1], "Spectrum set with the right color");
+  is(colorToSet[2], newColor[2], "Spectrum set with the right color");
+  is(colorToSet[3], newColor[3], "Spectrum set with the right color");
+
+  s.destroy();
+  testChangingColorShouldEmitEvents();
+}
+
+function testChangingColorShouldEmitEvents() {
+  let s = new Spectrum(doc.querySelector("#spectrum"), [255, 255, 255, 1]);
+  s.show();
+
+  s.once("changed", (event, rgba, color) => {
+    EventUtils.sendMouseEvent({type: "mouseup"}, s.dragger, doc.defaultView);
+
+    ok(true, "Changed event was emitted on color change");
+    is(rgba[0], 128, "New color is correct");
+    is(rgba[1], 64, "New color is correct");
+    is(rgba[2], 64, "New color is correct");
+    is(rgba[3], 1, "New color is correct");
+    is("rgba(" + rgba[0] + ", " + rgba[1] + ", " + rgba[2] + ", " + rgba[3] + ")", color, "RGBA and css color correspond");
+
+    s.destroy();
+    testSettingColorShoudUpdateTheUI();
+  });
+
+  executeSoon(() => {
+    EventUtils.synthesizeMouse(s.dragger, s.dragger.offsetWidth/2, s.dragger.offsetHeight/2, {}, content);
+  });
+}
+
+function testSettingColorShoudUpdateTheUI() {
+  let s = new Spectrum(doc.querySelector("#spectrum"), [255, 255, 255, 1]);
+  s.show();
+  let dragHelperOriginalPos = [s.dragHelper.style.top, s.dragHelper.style.left];
+  let alphaHelperOriginalPos = s.alphaSliderHelper.style.left;
+
+  s.rgb = [50, 240, 234, .2];
+  s.updateUI();
+
+  ok(s.alphaSliderHelper.style.left != alphaHelperOriginalPos, "Alpha helper has moved");
+  ok(s.dragHelper.style.top !== dragHelperOriginalPos[0], "Drag helper has moved");
+  ok(s.dragHelper.style.left !== dragHelperOriginalPos[1], "Drag helper has moved");
+
+  s.rgb = [240, 32, 124, 0];
+  s.updateUI();
+  is(s.alphaSliderHelper.style.left, - (s.alphaSliderHelper.offsetWidth/2) + "px",
+    "Alpha range UI has been updated again");
+
+  s.destroy();
+  executeSoon(endTests);
+}