Unit testing grails spock测试多部分文件

我用代码编写了以下旧方法，用于访问服务类中的请求对象，例如：

def someServiceMethod() {
  ....
  def webUtils = WebUtils.retrieveGrailsWebRequest()
  def request = webUtils.getCurrentRequest()
  MultipartHttpServletRequest mpr = (MultipartHttpServletRequest) request
  CommonsMultipartFile file = (CommonsMultipartFile) mpr.getFile("file")
  ....
}

这是我的serivce类单元测试代码

@TestFor(SomeService)
class SomeServiceSpec extends Specification {
  void "test someServiceMethod"() {
    given:
    MockMultipartHttpServletRequest request = new MockMultipartHttpServletRequest()

    FileInputStream inFile = new FileInputStream("./test-data/Hiearchy-003.xlsx") //valid file path
    def multipartFile = new GrailsMockMultipartFile('file', 'file.xls', 'multipart/form-data', inFile)
    request.addFile(multipartFile)
    GrailsWebRequest webRequest = new GrailsWebRequest(
            request,
            new MockHttpServletResponse(),
            new MockServletContext()
    )
    request.setAttribute(GrailsApplicationAttributes.WEB_REQUEST,webRequest)
    RequestContextHolder.setRequestAttributes(webRequest);

    when:
    def result = service.someServiceMethod()

    then:
    result != null
    //some more assertions
    //..
  }
}

我被以下错误所困扰

| Failure:  test someServiceMethod(SomeServiceSpec)
|  org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'org.codehaus.groovy.grails.plugins.testing.GrailsMockMultipartFile@6ae8e5dd' with class 'org.codehaus.groovy.grails.plugins.testing.GrailsMockMultipartFile' to class 'org.springframework.web.multipart.commons.CommonsMultipartFile'

---

以前有人在grails单元测试中遇到过这样的问题吗？

而不是：

GrailsMockMultipartFile

---

用法：

org.springframework.mock.web.MockMultipartFile

我刚刚意识到，如果我们直接使用输入流，下面这一行是不必要的，这应该不是问题，因此解决了我的问题

CommonsMultipartFile file = (CommonsMultipartFile) mpr.getFile("file")