Issue 5760 - Use relative require paths

qunit/tests/filterValidation.js

 "use strict";
 
 {
-  const {parseFilter, parseFilters} = require("filterValidation");
+  const {parseFilter, parseFilters} = require("../../lib/filterValidation");
   const {BlockingFilter,
          ElemHideFilter,
          CommentFilter} = require("../../adblockpluscore/lib/filterClasses");
 
   QUnit.module("Filter validation");
 
   test("Detecting invalid filters", () =>
   {
     equal(parseFilter("||example.com^$unknown").error.type, "invalid-filter",
           "unknown option");
@@ skipping 49 matching lines @@
     ok(result.filters[0] instanceof BlockingFilter, "1st filter is blocking");
     equal(result.filters[0].text, "||example.com^", "1st filter text matches");
 
     ok(result.filters[1] instanceof ElemHideFilter, "2nd filter is elemhide");
     equal(result.filters[1].text, "###foobar", "2nd filter text matches");
 
     ok(result.filters[2] instanceof CommentFilter, "3rd filter is comment");
     equal(result.filters[2].text, "! foo bar", "3rd filter text matches");
   });
 }