[improvement] Button: add test cases (#2870)

packages/button/test/index.spec.js

@@ -10,3 +10,51 @@ test('loading size', () => {
   });
   expect(wrapper).toMatchSnapshot();
 });
+
+test('click event', () => {
+  const onClick = jest.fn();
+  const wrapper = mount(Button, {
+    context: {
+      on: {
+        click: onClick
+      }
+    }
+  });
+
+  wrapper.trigger('click');
+  expect(onClick.mock.calls.length).toEqual(1);
+});
+
+test('not trigger click event when disabled', () => {
+  const onClick = jest.fn();
+  const wrapper = mount(Button, {
+    propsData: {
+      disabled: true
+    },
+    context: {
+      on: {
+        click: onClick
+      }
+    }
+  });
+
+  wrapper.trigger('click');
+  expect(onClick.mock.calls.length).toEqual(0);
+});
+
+test('not trigger click event when loading', () => {
+  const onClick = jest.fn();
+  const wrapper = mount(Button, {
+    propsData: {
+      loading: true
+    },
+    context: {
+      on: {
+        click: onClick
+      }
+    }
+  });
+
+  wrapper.trigger('click');
+  expect(onClick.mock.calls.length).toEqual(0);
+});