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Test Info: Warnings

<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
<window title="Mozilla Bug 1390159"
<!-- test code goes here -->
<script type="application/javascript"><![CDATA[
function test() {
var xulRuntime = Services.appinfo;
// Make sure it has an inSafeMode property. This is just an arbitrary
// readonly property.
var oldValue = xulRuntime.inSafeMode;
is(typeof oldValue, "boolean", "Expected an inSafeMode property");
// Changing a readonly property doesn't throw, but shouldn't change
// the value.
xulRuntime.inSafeMode = !oldValue;
is(xulRuntime.inSafeMode, oldValue, "Should not have modified prop");
// Adding a new property should throw.
let ex = null;
try {
xulRuntime.foobar = 1;
} catch (e) {
ex = e;
is(ex.toString().includes("Cannot modify"), true, "Expected an error");
is(xulRuntime.foobar, undefined, "Property not defined");
<!-- test results are displayed in the html:body -->