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diff --git a/devtools/client/shared/test/xpcshell/test_cubicBezier.js b/devtools/client/shared/test/xpcshell/test_cubicBezier.js
new file mode 100644
index 0000000000..708c910fd2
--- /dev/null
+++ b/devtools/client/shared/test/xpcshell/test_cubicBezier.js
@@ -0,0 +1,152 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests the CubicBezier API in the CubicBezierWidget module
+
+var {
+  CubicBezier,
+  parseTimingFunction,
+} = require("resource://devtools/client/shared/widgets/CubicBezierWidget.js");
+
+function run_test() {
+  throwsWhenMissingCoordinates();
+  throwsWhenIncorrectCoordinates();
+  convertsStringCoordinates();
+  coordinatesToStringOutputsAString();
+  pointGettersReturnPointCoordinatesArrays();
+  toStringOutputsCubicBezierValue();
+  toStringOutputsCssPresetValues();
+  testParseTimingFunction();
+}
+
+function throwsWhenMissingCoordinates() {
+  do_check_throws(() => {
+    new CubicBezier();
+  }, "Throws an exception when coordinates are missing");
+}
+
+function throwsWhenIncorrectCoordinates() {
+  do_check_throws(() => {
+    new CubicBezier([]);
+  }, "Throws an exception when coordinates are incorrect (empty array)");
+
+  do_check_throws(() => {
+    new CubicBezier([0, 0]);
+  }, "Throws an exception when coordinates are incorrect (incomplete array)");
+
+  do_check_throws(() => {
+    new CubicBezier(["a", "b", "c", "d"]);
+  }, "Throws an exception when coordinates are incorrect (invalid type)");
+
+  do_check_throws(() => {
+    new CubicBezier([1.5, 0, 1.5, 0]);
+  }, "Throws an exception when coordinates are incorrect (time range invalid)");
+
+  do_check_throws(() => {
+    new CubicBezier([-0.5, 0, -0.5, 0]);
+  }, "Throws an exception when coordinates are incorrect (time range invalid)");
+}
+
+function convertsStringCoordinates() {
+  info("Converts string coordinates to numbers");
+  const c = new CubicBezier(["0", "1", ".5", "-2"]);
+
+  Assert.equal(c.coordinates[0], 0);
+  Assert.equal(c.coordinates[1], 1);
+  Assert.equal(c.coordinates[2], 0.5);
+  Assert.equal(c.coordinates[3], -2);
+}
+
+function coordinatesToStringOutputsAString() {
+  info("coordinates.toString() outputs a string representation");
+
+  let c = new CubicBezier(["0", "1", "0.5", "-2"]);
+  let string = c.coordinates.toString();
+  Assert.equal(string, "0,1,.5,-2");
+
+  c = new CubicBezier([1, 1, 1, 1]);
+  string = c.coordinates.toString();
+  Assert.equal(string, "1,1,1,1");
+}
+
+function pointGettersReturnPointCoordinatesArrays() {
+  info("Points getters return arrays of coordinates");
+
+  const c = new CubicBezier([0, 0.2, 0.5, 1]);
+  Assert.equal(c.P1[0], 0);
+  Assert.equal(c.P1[1], 0.2);
+  Assert.equal(c.P2[0], 0.5);
+  Assert.equal(c.P2[1], 1);
+}
+
+function toStringOutputsCubicBezierValue() {
+  info("toString() outputs the cubic-bezier() value");
+
+  const c = new CubicBezier([0, 1, 1, 0]);
+  Assert.equal(c.toString(), "cubic-bezier(0,1,1,0)");
+}
+
+function toStringOutputsCssPresetValues() {
+  info("toString() outputs the css predefined values");
+
+  let c = new CubicBezier([0, 0, 1, 1]);
+  Assert.equal(c.toString(), "linear");
+
+  c = new CubicBezier([0.25, 0.1, 0.25, 1]);
+  Assert.equal(c.toString(), "ease");
+
+  c = new CubicBezier([0.42, 0, 1, 1]);
+  Assert.equal(c.toString(), "ease-in");
+
+  c = new CubicBezier([0, 0, 0.58, 1]);
+  Assert.equal(c.toString(), "ease-out");
+
+  c = new CubicBezier([0.42, 0, 0.58, 1]);
+  Assert.equal(c.toString(), "ease-in-out");
+}
+
+function testParseTimingFunction() {
+  info("test parseTimingFunction");
+
+  for (const test of ["ease", "linear", "ease-in", "ease-out", "ease-in-out"]) {
+    ok(parseTimingFunction(test), test);
+  }
+
+  ok(!parseTimingFunction("something"), "non-function token");
+  ok(!parseTimingFunction("something()"), "non-cubic-bezier function");
+  ok(
+    !parseTimingFunction(
+      "cubic-bezier(something)",
+      "cubic-bezier with non-numeric argument"
+    )
+  );
+  ok(!parseTimingFunction("cubic-bezier(1,2,3:7)", "did not see comma"));
+  ok(!parseTimingFunction("cubic-bezier(1,2,3,7:", "did not see close paren"));
+  ok(!parseTimingFunction("cubic-bezier(1,2", "early EOF after number"));
+  ok(!parseTimingFunction("cubic-bezier(1,2,", "early EOF after comma"));
+  deepEqual(
+    parseTimingFunction("cubic-bezier(1,2,3,7)"),
+    [1, 2, 3, 7],
+    "correct invocation"
+  );
+  deepEqual(
+    parseTimingFunction("cubic-bezier(1,  /* */ 2,3,   7  )"),
+    [1, 2, 3, 7],
+    "correct with comments and whitespace"
+  );
+}
+
+function do_check_throws(cb, details) {
+  info(details);
+
+  let hasThrown = false;
+  try {
+    cb();
+  } catch (e) {
+    hasThrown = true;
+  }
+
+  Assert.ok(hasThrown);
+}