test(Form): add submit、failed event test cases

src/form/test/index.spec.js

@@ -1 +1,58 @@
-// import { mount } from '../../../test';
+import { mount, later } from '../../../test';
+
+function mountForm(options) {
+  return mount(options, { attachToDocument: true });
+}
+
+test('submit event', async () => {
+  const onSubmit = jest.fn();
+  const wrapper = mountForm({
+    template: `
+        <van-form @submit="onSubmit">
+          <van-field name="A" value="bar" />
+          <van-button native-type="submit" />
+        </van-form>
+      `,
+    methods: {
+      onSubmit,
+    },
+  });
+
+  wrapper.find('.van-button').trigger('click');
+
+  await later();
+  expect(onSubmit).toHaveBeenCalledWith({ A: 'bar' });
+});
+
+test('failed event', async () => {
+  const onFailed = jest.fn();
+  const wrapper = mountForm({
+    template: `
+        <van-form @failed="onFailed">
+          <van-field name="A" :rules="rulesA" value="" />
+          <van-field name="B" :rules="rulesB" value="" />
+          <van-button native-type="submit" />
+        </van-form>
+      `,
+    data() {
+      return {
+        rulesA: [{ required: true, message: 'A failed' }],
+        rulesB: [{ required: true, message: 'B failed' }],
+      };
+    },
+    methods: {
+      onFailed,
+    },
+  });
+
+  wrapper.find('.van-button').trigger('click');
+
+  await later();
+  expect(onFailed).toHaveBeenCalledWith({
+    errors: [
+      { name: 'A', message: 'A failed' },
+      { name: 'B', message: 'B failed' },
+    ],
+    values: { A: '', B: '' },
+  });
+});