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qunit/tests/filterValidation.js

 "use strict";
 
+(function()
 {
   const {parseFilter, parseFilters} = require("filterValidation");
   const {BlockingFilter,
          ElemHideFilter,
          CommentFilter} = require("filterClasses");
 
   module("Filter validation");
 
   test("Detecting invalid filters", () =>
   {
-    equal(parseFilter("||example.com^$unknown").error.type, "invalid-filter", "unknown option");
-    equal(parseFilter("[foobar]").error.type, "unexpected-filter-list-header", "filter list header");
-    equal(parseFilter("##[foo").error.type, "invalid-css-selector", "invalid selector");
-    ok(/\b4\b/.test(parseFilters("!comment\r\n||example.com^\n\n##/").errors[0]), "error contains corresponding line number");
+    equal(parseFilter("||example.com^$unknown").error.type, "invalid-filter",
+          "unknown option");
+    equal(parseFilter("[foobar]").error.type, "unexpected-filter-list-header",
+          "filter list header");
+    equal(parseFilter("##[foo").error.type, "invalid-css-selector",
+          "invalid selector");
+    ok(
+      /\b4\b/.test(parseFilters("!comment\r\n||example.com^\n\n##/").errors[0]),
+      "error contains corresponding line number"
+    );
   });
 
   test("Allowing valid filters", () =>
   {
-    let text, filter;
+    let text;
+    let filter;
 
     text = "||example.com^";
-    filter = parseFilter(text).filter;
+    ({filter} = parseFilter(text));
     ok(filter instanceof BlockingFilter, "blocking filter parsed");
     equal(filter.text, text, "blocking filter text matches");
 
     text = '##div:first-child a[src="http://example.com"] > .foo + #bar';
-    filter = parseFilter(text).filter;
+    ({filter} = parseFilter(text));
     ok(filter instanceof ElemHideFilter, "elemhide filter parsed");
     equal(filter.text, text, "elemhide filter text matches");
 
     text = "! foo bar";
-    filter = parseFilter(text).filter;
+    ({filter} = parseFilter(text));
     ok(filter instanceof CommentFilter, "comment filter parsed");
     equal(filter.text, text, "comment filter text matches");
 
     equal(parseFilter("").filter, null, "empty filter parsed as 'null'");
   });
 
   test("Normalizing filters", () =>
   {
     let ws = " \t\r\n";
-
-    equal(parseFilter(ws + "@@" + ws + "||" + ws + "example.com" + ws + "^" + ws).filter.text, "@@||example.com^", "unnecessary spaces");
+    let filterText = ws + "@@" + ws + "||" + ws + "example.com" + ws + "^" + ws;
+    equal(parseFilter(filterText).filter.text, "@@||example.com^",
+          "unnecessary spaces");
     equal(parseFilter(ws).filter, null, "only spaces");
   });
 
   test("Parsing multiple filters", () =>
   {
     let result = parseFilters("||example.com^\n \n###foobar\r\n! foo bar\n");
 
     equal(result.errors.length, 0, "no error occurred");
     equal(result.filters.length, 3, "all filters parsed");
 
     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");
+    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");
+    ok(result.filters[2] instanceof CommentFilter, "3rd filter is comment");
+    equal(result.filters[2].text, "! foo bar", "3rd filter text matches");
   });
-}
+}());