Issue 6811 - Parse blank arguments to snippets correctly

test/snippets.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 163 matching lines @@
   checkParsedScript("Script with command names containing " +
                     "whitespace (spaces, tabs, newlines, etc.), " +
                     "quotes, and semicolons",
                     "fo\\'\\ \\ \\\t\\\n\\;o 1 2 3; 'b a  r' 1 2",
                     [["fo'  \t\n;o", "1", "2", "3"], ["b a  r", "1", "2"]]);
   checkParsedScript("Script containing Unicode composite characters",
                     "f\ud83d\ude42\ud83d\ude42 b\ud83d\ude02r",
                     [["f\ud83d\ude42\ud83d\ude42", "b\ud83d\ude02r"]]);
   checkParsedScript("Script with no-op commands", "foo; ;;; ;  ; bar 1",
                     [["foo"], ["bar", "1"]]);
+  checkParsedScript("Script with blank argument in the middle", "foo '' Hello",
+                    [["foo", "", "Hello"]]);
+  checkParsedScript("Script with blank argument at the end", "foo Hello ''",
+                    [["foo", "Hello", ""]]);
+  checkParsedScript("Script with consecutive blank arguments", "foo '' ''",
+                    [["foo", "", ""]]);
 
   test.done();
 };
 
 exports.testScriptCompilation = function(test)
 {
   let libraries = [
     `
       let foo = 0;
 
@@ skipping 53 matching lines @@
   // between executions. In the example below, assertFoo does not find 456 but
   // it doesn't find 123 either. It's the initial value 0.
   new Function(
     compileScript("setFoo 456; assertFoo 0", [
       ...libraries, "let foo = 1; exports.setFoo = value => { foo = value; };"
     ])
   )();
 
   test.done();
 };