Question

我试图仅模拟扩展另一个（getValue）的类（Collaborator）的方法（Person）。但是，在设置Expectations块之后，当调用此方法时，模拟类的构造函数不会执行super(...)。

以下示例是对此处显示的代码的修改：http://jmockit.org/tutorial/Mocking.html#partial

问题发生在对象Collaborator c3上。最后一个assert失败了，我希望它能通过。

public class PartialMockingTest
{
   static class Person
   {
      final int id;

      Person() { this.id = -1; }
      Person(int id) { this.id = id; }

      int getId() { return id; }
   }          

   static class Collaborator extends Person
   {
       final int value;

       Collaborator() { value = -1; }
       Collaborator(int value) { this.value = value; }
       Collaborator(int value, int id) { super(id); this.value = value; }

       int getValue() { return value; }
       final boolean simpleOperation(int a, String b, Date c) { return true; }
   }

   @Test
   public void partiallyMockingAClassAndItsInstances()
   {
      final Collaborator anyInstance = new Collaborator();

      new Expectations(Collaborator.class) {{
         anyInstance.getValue(); result = 123;
      }};

      // Not mocked, as no constructor expectations were recorded:
      Collaborator c1 = new Collaborator();
      Collaborator c2 = new Collaborator(150);
      Collaborator c3 = new Collaborator(150, 20); 

      // Mocked, as a matching method expectation was recorded:
      assertEquals(123, c1.getValue());
      assertEquals(123, c2.getValue());
      assertEquals(123, c3.getValue());

      // Not mocked:
      assertTrue(c1.simpleOperation(1, "b", null));
      assertEquals(45, new Collaborator(45).value);
      assertEquals(20, c3.getId()); // java.lang.AssertionError: expected:<20> but was:<-1>
   }

}

我做错了吗？这是一个错误吗？

Answer 1

我对 Expectations 系统的内部结构并不十分了解，但在调试代码之后，我意识到在构造对象之前的期望声明是在弄乱建设者＆＃39;调用

这样，如果你在构造之后移动期望，那么测试应该通过

final Collaborator anyInstance = new Collaborator();

// Not mocked, as no constructor expectations were recorded:
Collaborator c1 = new Collaborator();
Collaborator c2 = new Collaborator(150);
Collaborator c3 = new Collaborator(150, 20);

new Expectations(Collaborator.class) {{
   anyInstance.getValue(); result = 123;
}};

// Mocked, as a matching method expectation was recorded:
assertEquals(123, c1.getValue());
assertEquals(123, c2.getValue());
assertEquals(123, c3.getValue());

// Not mocked:
assertTrue(c1.simpleOperation(1, "b", null));
assertEquals(45, new Collaborator(45).value);
assertEquals(20, c3.getId());  //it works now

部分模拟子类的方法使它绕过超类构造函数

1 个答案: