1 files changed, 31 insertions, 0 deletions
diff --git a/netwerk/test/unit/test_bug580508.js b/netwerk/test/unit/test_bug580508.js
new file mode 100644
index 0000000000..a17f59b334
--- /dev/null
+++ b/netwerk/test/unit/test_bug580508.js
@@ -0,0 +1,31 @@
+"use strict";
+
+var ioService = Services.io;
+var resProt = ioService
+  .getProtocolHandler("resource")
+  .QueryInterface(Ci.nsIResProtocolHandler);
+
+function run_test() {
+  // Define a resource:// alias that points to another resource:// URI.
+  let greModulesURI = ioService.newURI("resource://gre/modules/");
+  resProt.setSubstitution("my-gre-modules", greModulesURI);
+
+  // When we ask for the alias, we should not get the resource://
+  // URI that we registered it for but the original file URI.
+  let greFileSpec = ioService.newURI(
+    "modules/",
+    null,
+    resProt.getSubstitution("gre")
+  ).spec;
+  let aliasURI = resProt.getSubstitution("my-gre-modules");
+  Assert.equal(aliasURI.spec, greFileSpec);
+
+  // Resolving URIs using the original resource path and the alias
+  // should yield the same result.
+  let greNetUtilURI = ioService.newURI("resource://gre/modules/NetUtil.jsm");
+  let myNetUtilURI = ioService.newURI("resource://my-gre-modules/NetUtil.jsm");
+  Assert.equal(
+    resProt.resolveURI(greNetUtilURI),
+    resProt.resolveURI(myNetUtilURI)
+  );
+}