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diff --git a/devtools/client/shared/test/browser_cubic-bezier-02.js b/devtools/client/shared/test/browser_cubic-bezier-02.js
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+++ b/devtools/client/shared/test/browser_cubic-bezier-02.js
@@ -0,0 +1,206 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests the CubicBezierWidget events
+
+const {
+  CubicBezierWidget,
+} = require("resource://devtools/client/shared/widgets/CubicBezierWidget.js");
+const {
+  PREDEFINED,
+} = require("resource://devtools/client/shared/widgets/CubicBezierPresets.js");
+
+// In this test we have to use a slightly more complete HTML tree, with <body>
+// in order to remove its margin and prevent shifted positions
+const TEST_URI = CHROME_URL_ROOT + "doc_cubic-bezier-02.html";
+
+add_task(async function () {
+  const { host, win, doc } = await createHost("bottom", TEST_URI);
+
+  // Required or widget will be clipped inside of 'bottom'
+  // host by -14. Setting `fixed` zeroes this which is needed for
+  // calculating offsets. Occurs in test env only.
+  doc.body.setAttribute("style", "position: fixed; margin: 0;");
+
+  const container = doc.querySelector("#cubic-bezier-container");
+  const w = new CubicBezierWidget(container, PREDEFINED.linear);
+
+  const rect = w.curve.getBoundingClientRect();
+  rect.graphTop = rect.height * w.bezierCanvas.padding[0];
+  rect.graphBottom = rect.height - rect.graphTop;
+  rect.graphHeight = rect.graphBottom - rect.graphTop;
+
+  await pointsCanBeDragged(w, win, doc, rect);
+  await curveCanBeClicked(w, win, doc, rect);
+  await pointsCanBeMovedWithKeyboard(w, win, doc, rect);
+
+  w.destroy();
+  host.destroy();
+});
+
+async function pointsCanBeDragged(widget, win, doc, offsets) {
+  info("Checking that the control points can be dragged with the mouse");
+
+  info("Listening for the update event");
+  let onUpdated = widget.once("updated");
+
+  info("Generating a mousedown/move/up on P1");
+  widget._onPointMouseDown({ target: widget.p1 });
+  doc.onmousemove({ pageX: offsets.left, pageY: offsets.graphTop });
+  doc.onmouseup();
+
+  let bezier = await onUpdated;
+  ok(true, "The widget fired the updated event");
+  ok(bezier, "The updated event contains a bezier argument");
+  is(bezier.P1[0], 0, "The new P1 time coordinate is correct");
+  is(bezier.P1[1], 1, "The new P1 progress coordinate is correct");
+
+  info("Listening for the update event");
+  onUpdated = widget.once("updated");
+
+  info("Generating a mousedown/move/up on P2");
+  widget._onPointMouseDown({ target: widget.p2 });
+  doc.onmousemove({ pageX: offsets.right, pageY: offsets.graphBottom });
+  doc.onmouseup();
+
+  bezier = await onUpdated;
+  is(bezier.P2[0], 1, "The new P2 time coordinate is correct");
+  is(bezier.P2[1], 0, "The new P2 progress coordinate is correct");
+}
+
+async function curveCanBeClicked(widget, win, doc, offsets) {
+  info("Checking that clicking on the curve moves the closest control point");
+
+  info("Listening for the update event");
+  let onUpdated = widget.once("updated");
+
+  info("Click close to P1");
+  let x = offsets.left + offsets.width / 4.0;
+  let y = offsets.graphTop + offsets.graphHeight / 4.0;
+  widget._onCurveClick({ pageX: x, pageY: y });
+
+  let bezier = await onUpdated;
+  ok(true, "The widget fired the updated event");
+  is(bezier.P1[0], 0.25, "The new P1 time coordinate is correct");
+  is(bezier.P1[1], 0.75, "The new P1 progress coordinate is correct");
+  is(bezier.P2[0], 1, "P2 time coordinate remained unchanged");
+  is(bezier.P2[1], 0, "P2 progress coordinate remained unchanged");
+
+  info("Listening for the update event");
+  onUpdated = widget.once("updated");
+
+  info("Click close to P2");
+  x = offsets.right - offsets.width / 4;
+  y = offsets.graphBottom - offsets.graphHeight / 4;
+  widget._onCurveClick({ pageX: x, pageY: y });
+
+  bezier = await onUpdated;
+  is(bezier.P2[0], 0.75, "The new P2 time coordinate is correct");
+  is(bezier.P2[1], 0.25, "The new P2 progress coordinate is correct");
+  is(bezier.P1[0], 0.25, "P1 time coordinate remained unchanged");
+  is(bezier.P1[1], 0.75, "P1 progress coordinate remained unchanged");
+}
+
+async function pointsCanBeMovedWithKeyboard(widget, win, doc, offsets) {
+  info("Checking that points respond to keyboard events");
+
+  const singleStep = 3;
+  const shiftStep = 30;
+
+  info("Moving P1 to the left");
+  let newOffset = parseInt(widget.p1.style.left, 10) - singleStep;
+  let x = widget.bezierCanvas.offsetsToCoordinates({
+    style: { left: newOffset },
+  })[0];
+
+  let onUpdated = widget.once("updated");
+  widget._onPointKeyDown(getKeyEvent(widget.p1, 37));
+  let bezier = await onUpdated;
+
+  is(bezier.P1[0], x, "The new P1 time coordinate is correct");
+  is(bezier.P1[1], 0.75, "The new P1 progress coordinate is correct");
+
+  info("Moving P1 to the left, fast");
+  newOffset = parseInt(widget.p1.style.left, 10) - shiftStep;
+  x = widget.bezierCanvas.offsetsToCoordinates({
+    style: { left: newOffset },
+  })[0];
+
+  onUpdated = widget.once("updated");
+  widget._onPointKeyDown(getKeyEvent(widget.p1, 37, true));
+  bezier = await onUpdated;
+  is(bezier.P1[0], x, "The new P1 time coordinate is correct");
+  is(bezier.P1[1], 0.75, "The new P1 progress coordinate is correct");
+
+  info("Moving P1 to the right, fast");
+  newOffset = parseInt(widget.p1.style.left, 10) + shiftStep;
+  x = widget.bezierCanvas.offsetsToCoordinates({
+    style: { left: newOffset },
+  })[0];
+
+  onUpdated = widget.once("updated");
+  widget._onPointKeyDown(getKeyEvent(widget.p1, 39, true));
+  bezier = await onUpdated;
+  is(bezier.P1[0], x, "The new P1 time coordinate is correct");
+  is(bezier.P1[1], 0.75, "The new P1 progress coordinate is correct");
+
+  info("Moving P1 to the bottom");
+  newOffset = parseInt(widget.p1.style.top, 10) + singleStep;
+  let y = widget.bezierCanvas.offsetsToCoordinates({
+    style: { top: newOffset },
+  })[1];
+
+  onUpdated = widget.once("updated");
+  widget._onPointKeyDown(getKeyEvent(widget.p1, 40));
+  bezier = await onUpdated;
+  is(bezier.P1[0], x, "The new P1 time coordinate is correct");
+  is(bezier.P1[1], y, "The new P1 progress coordinate is correct");
+
+  info("Moving P1 to the bottom, fast");
+  newOffset = parseInt(widget.p1.style.top, 10) + shiftStep;
+  y = widget.bezierCanvas.offsetsToCoordinates({
+    style: { top: newOffset },
+  })[1];
+
+  onUpdated = widget.once("updated");
+  widget._onPointKeyDown(getKeyEvent(widget.p1, 40, true));
+  bezier = await onUpdated;
+  is(bezier.P1[0], x, "The new P1 time coordinate is correct");
+  is(bezier.P1[1], y, "The new P1 progress coordinate is correct");
+
+  info("Moving P1 to the top, fast");
+  newOffset = parseInt(widget.p1.style.top, 10) - shiftStep;
+  y = widget.bezierCanvas.offsetsToCoordinates({
+    style: { top: newOffset },
+  })[1];
+
+  onUpdated = widget.once("updated");
+  widget._onPointKeyDown(getKeyEvent(widget.p1, 38, true));
+  bezier = await onUpdated;
+  is(bezier.P1[0], x, "The new P1 time coordinate is correct");
+  is(bezier.P1[1], y, "The new P1 progress coordinate is correct");
+
+  info("Checking that keyboard events also work with P2");
+  info("Moving P2 to the left");
+  newOffset = parseInt(widget.p2.style.left, 10) - singleStep;
+  x = widget.bezierCanvas.offsetsToCoordinates({
+    style: { left: newOffset },
+  })[0];
+
+  onUpdated = widget.once("updated");
+  widget._onPointKeyDown(getKeyEvent(widget.p2, 37));
+  bezier = await onUpdated;
+  is(bezier.P2[0], x, "The new P2 time coordinate is correct");
+  is(bezier.P2[1], 0.25, "The new P2 progress coordinate is correct");
+}
+
+function getKeyEvent(target, keyCode, shift = false) {
+  return {
+    target,
+    keyCode,
+    shiftKey: shift,
+    preventDefault: () => {},
+  };
+}