我们可以在formik YupValidationSchema中添加自定义验证吗？

import * as Yup from 'yup';
import { useFormik } from 'formik';

const validationSchema = Yup.object().shape({
  name: Yup.string()
    .required('姓名是必填项')
    .test('custom-validation', '自定义验证失败', function(value) {
      // 在这里编写自定义验证逻辑
      // 如果验证通过，返回true；否则，返回false
      return value === 'custom';
    }),
});

function MyForm() {
  const formik = useFormik({
    initialValues: {
      name: '',
    },
    validationSchema,
    onSubmit: values => {
      // 处理表单提交
    },
  });

  return (
    <form onSubmit={formik.handleSubmit}>
      <input
        type="text"
        name="name"
        value={formik.values.name}
        onChange={formik.handleChange}
        onBlur={formik.handleBlur}
      />
      {formik.touched.name && formik.errors.name && (
        <div>{formik.errors.name}</div>
      )}
      <button type="submit">提交</button>
    </form>
  );
}