MAGETWO-71835: [Product grid] SC's values aren't sorted alphabetically in the tooltip

- Add js unit test

Author: VeronikaYarats

dev/tests/js/jasmine/tests/app/code/Magento/Ui/base/js/grid/columns/expandable.test.js

@@ -69,5 +69,22 @@ define([
                 expect(expandable.getLabel).toHaveBeenCalled();
             });
         });
+
+        describe('getLabelsArray method', function () {
+            it('check if label array sort alphabetically case insensitive', function () {
+                record['shared_catalog'].push(1, 2 , 3);
+                expandable.options.push({
+                    label: 'Default',
+                    value: '1'
+                }, {
+                    label: 'Label',
+                    value: '2'
+                }, {
+                    label: 'default',
+                    value: '3'
+                });
+                expect(expandable.getLabelsArray(record)).toEqual(['Default', 'default', 'Label']);
+            });
+        });
     });
 });