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-rw-r--r--js/xpconnect/tests/unit/test_generateQI.js29
1 files changed, 29 insertions, 0 deletions
diff --git a/js/xpconnect/tests/unit/test_generateQI.js b/js/xpconnect/tests/unit/test_generateQI.js
new file mode 100644
index 0000000000..d54ed53212
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+++ b/js/xpconnect/tests/unit/test_generateQI.js
@@ -0,0 +1,29 @@
+"use strict";
+
+add_task(async function test_generateQI() {
+ function checkQI(interfaces, iface) {
+ let obj = {
+ QueryInterface: ChromeUtils.generateQI(interfaces),
+ };
+ equal(obj.QueryInterface(iface), obj,
+ `Correct return value for query to ${iface}`);
+ }
+
+ // Test success scenarios.
+ checkQI([], Ci.nsISupports);
+
+ checkQI([Ci.nsIPropertyBag, "nsIPropertyBag2"], Ci.nsIPropertyBag);
+ checkQI([Ci.nsIPropertyBag, "nsIPropertyBag2"], Ci.nsIPropertyBag2);
+
+ checkQI([Ci.nsIPropertyBag, "nsIPropertyBag2", "nsINotARealInterface"], Ci.nsIPropertyBag2);
+
+ // Non-IID values get stringified, and don't cause any errors as long
+ // as there isn't a non-IID property with the same name on Ci.
+ checkQI([Ci.nsIPropertyBag, "nsIPropertyBag2", null, Object], Ci.nsIPropertyBag2);
+
+ ChromeUtils.generateQI([])(Ci.nsISupports);
+
+ // Test failure scenarios.
+ Assert.throws(() => checkQI([], Ci.nsIPropertyBag),
+ e => e.result == Cr.NS_ERROR_NO_INTERFACE);
+});