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diff --git a/layout/inspector/tests/test_css_property_is_shorthand.html b/layout/inspector/tests/test_css_property_is_shorthand.html
new file mode 100644
index 000000000..e5fbcc1c9
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+++ b/layout/inspector/tests/test_css_property_is_shorthand.html
@@ -0,0 +1,51 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test inDOMUtils::CssPropertyIsShorthand</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript;version=1.8">
+  let utils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+                           .getService(SpecialPowers.Ci.inIDOMUtils);
+
+  let tests = [
+    {
+      property: "color",
+      expected: false
+    },
+    {
+      property: "background",
+      expected: true
+    },
+    {
+      property: "--anything",
+      expected: false
+    }
+  ];
+
+  for (let {property, expected} of tests) {
+    let result = utils.cssPropertyIsShorthand(property);
+    is(result, expected, "checking whether " + property + " is shorthand");
+  }
+
+  let sawException = false;
+  try {
+    let result = utils.cssPropertyIsShorthand("nosuchproperty");
+  } catch (e) {
+    sawException = true;
+  }
+  ok(sawException, "checking whether nosuchproperty throws");
+
+  </script>
+</head>
+<body>
+<h1>Test inDOMUtils::CssPropertyIsShorthand</h1>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>