Issue 6931 - Allow content filters for localhost

test/filterClasses.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 375 matching lines @@
   compareFilter(test, "foo.com,~baR#?#:-abp-properties(abc)", ["type=elemhideemulation", "text=foo.com,~baR#?#:-abp-properties(abc)", "selectorDomains=foo.com", "selector=:-abp-properties(abc)", "domains=foo.com|~bar"]);
   compareFilter(test, "~foo.com,bar.com#?#:-abp-properties(abc)", ["type=elemhideemulation", "text=~foo.com,bar.com#?#:-abp-properties(abc)", "selectorDomains=bar.com", "selector=:-abp-properties(abc)", "domains=bar.com|~foo.com"]);
 
   // Check some special cases
   compareFilter(test, "#?#:-abp-properties(abc)", ["type=invalid", "text=#?#:-abp-properties(abc)", "reason=filter_elemhideemulation_nodomain"]);
   compareFilter(test, "foo.com#?#abc", ["type=elemhideemulation", "text=foo.com#?#abc", "selectorDomains=foo.com", "selector=abc", "domains=foo.com"]);
   compareFilter(test, "foo.com#?#:-abp-foobar(abc)", ["type=elemhideemulation", "text=foo.com#?#:-abp-foobar(abc)", "selectorDomains=foo.com", "selector=:-abp-foobar(abc)", "domains=foo.com"]);
   compareFilter(test, "foo.com#?#aaa :-abp-properties(abc) bbb", ["type=elemhideemulation", "text=foo.com#?#aaa :-abp-properties(abc) bbb", "selectorDomains=foo.com", "selector=aaa :-abp-properties(abc) bbb", "domains=foo.com"]);
   compareFilter(test, "foo.com#?#:-abp-properties(|background-image: url(data:*))", ["type=elemhideemulation", "text=foo.com#?#:-abp-properties(|background-image: url(data:*))", "selectorDomains=foo.com", "selector=:-abp-properties(|background-image: url(data:*))", "domains=foo.com"]);
 
+  // Support element hiding emulation filters for localhost (#6931).
+  compareFilter(test, "localhost#?#:-abp-properties(abc)", ["type=elemhideemulation", "text=localhost#?#:-abp-properties(abc)", "selectorDomains=localhost", "selector=:-abp-properties(abc)", "domains=localhost"]);
+
   test.done();
 };
 
 exports.testEmptyElemHideDomains = function(test)
 {
   let emptyDomainFilters = [
     ",##selector", ",,,##selector", "~,foo.com##selector", "foo.com,##selector",
     ",foo.com##selector", "foo.com,~##selector",
     "foo.com,,bar.com##selector", "foo.com,~,bar.com##selector"
   ];
@@ skipping 200 matching lines @@
   // This compares the references to make sure that both refer to the same
   // object (#6815).
   test.equal(filter1.domains, filter2.domains);
 
   let filter3 = Filter.fromText("www.example.com##.bar");
 
   test.notEqual(filter2.domains, filter3.domains);
 
   test.done();
 };