如何用通配符模拟泛型方法的行为 [英] How to mock behavior of generic method with wildcard

问题描述

我使用EasyMock（3.2）。我想为基于Spring Security的部分安全系统编写测试。我想嘲笑 身份验证 ，以便它返回空的权限列表。它的方法声明如下：

 集合<扩展GrantedAuthority> getAuthorities（）; 
  

所以我写了一个测试：

 认证认证= createMock（Authentication.class）; 
收藏<？扩展GrantedAuthority>权威= Collections.emptyList（）; 
 expect（authentication.getAuthorities（））andReturn（authorities）; 
  

但编译器抱怨和Return call：



类型IExpectationSetters< Collection< capture中的方法和返回（Collection

我做错了什么？

---

更新：

当我更改权限到：

 集合<授予授权>权限=集合.emptyList（）; 
  

如上所示，它仍然不能编译，但是错误有点不同：

$ b $在类型IExpectationSetters< Collection<捕获＃1-of？extends GrantedAuthority>>的类型中的方法和返回（Collection ）不是（Collection< GrantedAuthority>）

我确保 GrantedAuthority 在两个声明中都是相同的 - org.springframework.security.core.GrantedAuthority 。

解决方案

删除该项目从收集声明中键入，你会得到一个警告，但测试将工作。

  @Test 
 public void testFoo（）
 {
 // setup 
 Authentication mockAuthentication = createMock（Authentication.class）; 
收藏权限= Collections.emptyList（）; 
 expect（mockAuthentication.getAuthorities（））andReturn（authorities）; 
 
 //练习
 EasyMock.replay（mockAuthentication）; 
收藏<？扩展GrantedAuthority> retAuth = mockAuthentication.getAuthorities（）; 
 
 // verify 
 EasyMock.verify（mockAuthentication）; 
 assertEquals（authorities，retAuth）; 
} 
  

I'm using EasyMock (3.2). I want to write a test for part of my security system based on Spring Security. I want to mock the Authentication so that it returns empty list of authorities. Its method declaration is as follows:

 Collection<? extends GrantedAuthority> getAuthorities();

So I write a test:

Authentication authentication = createMock(Authentication.class);
Collection<? extends GrantedAuthority> authorities = Collections.emptyList();
expect(authentication.getAuthorities()).andReturn(authorities);

But the compiler is complaining about the third line on andReturn call:

The method andReturn(Collection<capture#1-of ? extends GrantedAuthority>) in the type IExpectationSetters<Collection<capture#1-of ? extends GrantedAuthority>> is not applicable for the arguments (Collection<capture#2-of ? extends GrantedAuthority>

What am I doing wrong?

---

UPDATE:

When I change the declaration of authorities to:

Collection<GrantedAuthority> authorities = Collections.emptyList();

as suggested, it still does not compile, but the error is a bit different:

The method andReturn(Collection<capture#1-of ? extends GrantedAuthority>) in the type IExpectationSetters<Collection<capture#1-of ? extends GrantedAuthority>> is not applicable for the arguments (Collection<GrantedAuthority>)

I ensured that the GrantedAuthority is actually the same in both declarations - org.springframework.security.core.GrantedAuthority.

解决方案

Remove the item type from the collection declaration, you'll get a warning but the test will work.

@Test
public void testFoo()
    {
    // setup
    Authentication mockAuthentication = createMock(Authentication.class);
    Collection authorities = Collections.emptyList();
    expect(mockAuthentication.getAuthorities()).andReturn(authorities);

    // exercise
    EasyMock.replay(mockAuthentication);
    Collection<? extends GrantedAuthority> retAuth = mockAuthentication.getAuthorities();

    // verify
    EasyMock.verify(mockAuthentication);
    assertEquals(authorities, retAuth);
    }

这篇关于如何用通配符模拟泛型方法的行为的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！