这是Groovy中一个非常简单的spock测试用例。!!此规范文件中定义的所有类/接口。 (spock中的规范文件只是一个测试用例文件)。
似乎无法理解工作流程。如何在测试用例工作流中实例化,注入和销毁模拟对象?任何帮助表示赞赏...
我遇到的特殊问题是理解交互语句:1 * mockURLAdapter.openConnection()是如何工作的。根据我的理解,这只是一个验证语句,声明使用非空参数调用方法'openConnection(_)'。如何/为什么调用此断言会导致方法weatherService.run()失败?返回的异常显示在代码中......
import spock.lang.Specification
class WeatherServiceImpl {
private URLAdapter urlAdapter;
private URLConnection urlConn;
public WeatherServiceImpl(urlAdapter){
this.urlAdapter=urlAdapter
}
def run(city) {
urlConn=urlAdapter.openConnection(city)
return urlConn.getResponseCode()
}
}
interface URLAdapter {
def openConnection(city)
}
class WeatherServiceImplSpec extends Specification {
def mockURLAdapter = Mock(URLAdapter)
def mockURLConn = Mock(HttpURLConnection)
def weatherService=new WeatherServiceImpl(mockURLAdapter);
def "Need to figure out the effects of lines: 'troublesome' and 'weirdo' "() {
given:
mockURLConn.getResponseCode()>> 9999
mockURLAdapter.openConnection(_)>>mockURLConn;
when:
def result=weatherService.run("New York")
then:
// Uncommenting line 'troublesome' below throws a null-pointer exception:
// java.lang.NullPointerException: Cannot invoke method getResponseCode() on null object
// at WeatherServiceImpl.run(URLAdapterConnectionSpec.groovy:29)
// at WeatherServiceImplSpec.delivers events to all subscribers(URLAdapterConnectionSpec.groovy:54)
// Commenting out line 'troublesome' gives no issue!!
// Line 'troublesome':
// 1*mockURLAdapter.openConnection(_)
// Line 'weirdo':
// And yet, line 'weirdo' works just fine, commented or not!(i.e. test passes, no exception thrown)!!
1*mockURLAdapter.openConnection(_)>>mockURLConn;
//WTH is happening! ?
result==9999
}
}
答案 0 :(得分:2)
你指定了两次mockURLAdapter应该返回的内容以及你第二次说不返回任何内容,当然它仍然是你最后的决定。
// Line 'troublesome':
1 * mockURLAdapter.openConnection(_)
这意味着当调用openConnection(_)时不会返回任何内容。如果要指定交互,则应将其放在 then:子句
中正确的做法应该是这样的:
def "Need to figure out the effects of lines: 'troublesome' and 'weirdo' "() {
when:
def result=weatherService.run("New York")
then:
1 * mockURLAdapter.openConnection(_) >> mockURLConn;
1 * mockURLConn.getResponseCode() >> 9999
result == 9999
}