Gruntfile.js: Make sure paths are unique /after/ having stripped off …

…the index.html.

(cherry picked from commit 0f21e34)

Gruntfile.js

@@ -361,7 +361,9 @@ module.exports = function( grunt ) {
 					urls: (function() {
 						// Find the test files
 						var suites = grunt.util._.without( ( grunt.option( "suites" ) || "" ).split( "," ), "" ),
-							patterns, paths, idx, onePath = "", uniquePaths = [],
+							patterns, paths, idx,
+							onePath = "",
+							uniquePaths = [],
 							versionedPaths = [],
 							jQueries = grunt.util._.without( ( grunt.option( "jqueries" ) || "" ).split( "," ), "" );
 
@@ -374,18 +376,20 @@ module.exports = function( grunt ) {
 							patterns = [ "tests/unit/*/index.html", "tests/unit/*/*/index.html", "tests/unit/**/*-tests.html" ];
 						}
 
-						paths = grunt.file.expand( patterns ).sort();
+						paths = grunt.file.expand( patterns )
+							.sort()
+							.map( function( path ) {
+								// Some of our tests (ie. navigation) don't like having the index.html too much
+								return path.replace( /\/\index.html$/, "/" );
+							});
+
 						for ( idx in paths ) {
 							if ( onePath !== paths[ idx ] ) {
 								onePath = paths[ idx ];
 								uniquePaths.push( onePath );
 							}
 						}
-
-						uniquePaths.map( function( path ) {
-							// Some of our tests (ie. navigation) don't like having the index.html too much
-							return path.replace( /\/\index.html$/, "/" );
-						});
+						paths = uniquePaths;
 
 						if ( jQueries.length ) {
 							paths.forEach( function( path ) {