Improving tests

Author: David-Desmaisons

src/vuedraggable.js

@@ -162,6 +162,10 @@ const draggableComponent = {
     return h(this.getTag(), attributes, children);
   },
 
+  renderError (h, err) {
+    return h('pre', { style: { color: 'red' }}, err.stack)
+  },
+
   created() {
     if (this.list !== null && this.value !== null) {
       console.error(

tests/unit/vuedraggable.spec.js

@@ -760,6 +760,12 @@ describe("draggable.vue when initialized with a transition group", () => {
     expect(wrapper.html()).toEqual(initialRenderTransition);
   })
 
+  it("creates sortable instance with options on transition root", () => {
+    expect(Sortable.mock.calls.length).toBe(1);
+    const parameters = Sortable.mock.calls[0];
+    expect(parameters[0]).toBe(element.children[0]);
+  })
+
   describe("when initiating a drag operation", () => {
     let evt;
     beforeEach(() => {