test(Form): add test cases of methods

src/form/test/shared.js

@@ -3,3 +3,26 @@ import { mount } from '../../../test';
 export function mountForm(options) {
   return mount(options, { attachToDocument: true });
 }
+
+export function getSimpleRules() {
+  return {
+    rulesA: [{ required: true, message: 'A failed' }],
+    rulesB: [{ required: true, message: 'B failed' }],
+  };
+}
+
+export function mountSimpleRulesForm(options) {
+  return mountForm({
+    template: `
+      <van-form ref="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 getSimpleRules();
+    },
+    ...options,
+  });
+}