+ QUnit.test( 'normalizeExtension', 5, function ( assert ) {
+ var extension, i, thisCase, prefix,
+ cases = [
+ {
+ extension: 'png',
+ expected: 'png',
+ description: 'Extension already in canonical form'
+ },
+ {
+ extension: 'PNG',
+ expected: 'png',
+ description: 'Extension lowercased in canonical form'
+ },
+ {
+ extension: 'jpeg',
+ expected: 'jpg',
+ description: 'Extension changed in canonical form'
+ },
+ {
+ extension: 'JPEG',
+ expected: 'jpg',
+ description: 'Extension lowercased and changed in canonical form'
+ },
+ {
+ extension: '~~~',
+ expected: '',
+ description: 'Extension invalid and discarded'
+ }
+ ];
+
+ for ( i = 0; i < cases.length; i++ ) {
+ thisCase = cases[ i ];
+ extension = mw.Title.normalizeExtension( thisCase.extension );
+
+ prefix = '[' + thisCase.description + '] ';
+ assert.equal( extension, thisCase.expected, prefix + 'Extension as expected' );
+ }
+ } );
+
+ QUnit.test( 'newFromUserInput', 12, function ( assert ) {