[Improvement] optimize find parent mixin (#781)

test/specs/actionsheet.spec.js

@@ -14,7 +14,6 @@ describe('ActionSheet', () => {
     });
 
     expect(wrapper.hasClass('van-actionsheet')).to.be.true;
-    expect(wrapper.contains('.van-actionsheet__list')).to.be.true;
     expect(wrapper.instance().actions.length).to.equal(0);
     expect(wrapper.instance().overlay).to.be.true;
     expect(wrapper.instance().closeOnClickOverlay).to.be.true;

test/specs/contact.spec.js

@@ -229,7 +229,7 @@ describe('ContactEdit', () => {
 
     const deleteButton = wrapper.find('.van-button')[1];
     deleteButton.trigger('click');
-    wrapper.vm.onDeleteContact();
+    wrapper.vm.onDelete();
 
     setTimeout(() => {
       wrapper.vm.isDeleting = false;

test/specs/field.spec.js

@@ -69,6 +69,7 @@ describe('Field', () => {
 
   it('create a autosize textarea field', (done) => {
     wrapper = mount(Field, {
+      attachToDocument: true,
       propsData: {
         type: 'textarea',
         autosize: {}
@@ -88,7 +89,6 @@ describe('Field', () => {
     textareaElement.value = longText;
     textarea.trigger('input');
 
-    wrapper.update();
     setTimeout(() => {
       expect(wrapper.find('.van-field__control')[0].element.value).to.equal(longText);
       expect(textareaElement.style.height).to.equal((textareaElement.scrollHeight - textAreaDiff) + 'px');