Dropdown widget tests

ng2-components/ng2-activiti-form/src/components/widgets/dropdown/dropdown.widget.spec.ts

@@ -20,6 +20,7 @@ import { FormService } from '../../../services/form.service';
 import { DropdownWidget } from './dropdown.widget';
 import { FormModel } from './../core/form.model';
 import { FormFieldModel } from './../core/form-field.model';
+import { FormFieldOption } from './../core/form-field-option';
 
 describe('DropdownWidget', () => {
 
@@ -32,6 +33,18 @@ describe('DropdownWidget', () => {
         widget.field = new FormFieldModel(new FormModel());
     });
 
+    it('should require field with restUrl', () => {
+        spyOn(formService, 'getRestFieldValues').and.stub();
+
+        widget.field = null;
+        widget.ngOnInit();
+        expect(formService.getRestFieldValues).not.toHaveBeenCalled();
+
+        widget.field = new FormFieldModel(null, { restUrl: null });
+        widget.ngOnInit();
+        expect(formService.getRestFieldValues).not.toHaveBeenCalled();
+    });
+
     it('should request field values from service', () => {
         const taskId = '<form-id>';
         const fieldId = '<field-id>';
@@ -58,4 +71,27 @@ describe('DropdownWidget', () => {
         widget.handleError('Err');
         expect(console.error).toHaveBeenCalledWith('Err');
     });
+
+    it('should preserve empty option when loading fields', () => {
+        let restFieldValue: FormFieldOption = <FormFieldOption> { id: '1', name: 'Option1' };
+        spyOn(formService, 'getRestFieldValues').and.returnValue(Observable.create(observer => {
+            observer.next([restFieldValue]);
+            observer.complete();
+        }));
+
+        let form = new FormModel({ taskId: '<id>' });
+        let emptyOption: FormFieldOption = <FormFieldOption> { id: 'empty', name: 'Empty' };
+        widget.field = new FormFieldModel(form, {
+            id: '<id>',
+            restUrl: '/some/url/address',
+            hasEmptyValue: true,
+            options: [emptyOption]
+        });
+        widget.ngOnInit();
+
+        expect(formService.getRestFieldValues).toHaveBeenCalled();
+        expect(widget.field.options.length).toBe(2);
+        expect(widget.field.options[0]).toBe(emptyOption);
+        expect(widget.field.options[1]).toBe(restFieldValue);
+    });
 });