Issue 5137 - [emscripten] Added basic filter storage implementation

test/subscriptionClasses.js

Index: test/subscriptionClasses.js
===================================================================
--- a/test/subscriptionClasses.js
+++ b/test/subscriptionClasses.js
@@ -116,25 +116,28 @@ exports.testDefaultSubscriptionIDs = fun
 exports.testSubscriptionDefaults = function(test)
 {
   let tests = [
     ["blocking", "test"],
     ["whitelist", "@@test"],
     ["elemhide", "##test"],
     ["elemhide", "#@#test"],
     ["elemhide", "foo##[-abp-properties='foo']"],
-    ["blocking", "!test"],
-    ["blocking", "/??/"],
+    ["", "!test"],
+    ["", "/??/"],
     ["blocking whitelist", "test", "@@test"],
     ["blocking elemhide", "test", "##test"]
   ];
 
   for (let [defaults, ...filters] of tests)
   {
-    compareSubscription(test, "~user~" + filters.join("~"), ["url=~user~" + filters.join("~"), "defaults= " + defaults], subscription =>
+    let expected = ["url=~user~" + filters.join("~")];
+    if (defaults)
+      expected.push("defaults= " + defaults);
+    compareSubscription(test, "~user~" + filters.join("~"), expected, subscription =>
     {
       for (let text of filters)
       {
         let filter = Filter.fromText(text);
         subscription.makeDefaultFor(filter);
         filter.delete();
       }
     });