Java JUnit4 : Make simple assertEquals Test pass

Question

我正在尝试使用assertEquals pass 进行一个简单的测试——在我的例子中:assertEquals(bob,cell.getLifeForm());。

第一次测试assertTrue(success);有效，意味着 boolean success = cell.addLifeForm(bob);有效。

但是我无法得到assertEquals(bob,cell.getLifeForm());通过。我相信我必须添加实例变量 LifeForm myLifeForm;因此 Cell 类可以跟踪 LifeForm，现在我需要在 getLifeForm() 中返回实例变量，并更新 addLifeForm 以正确修改实例变量(在这个方面遇到问题)。谢谢。

TestCell.java:

import static org.junit.Assert.*;
import org.junit.Test;
/**
* The test cases for the Cell class
*
*/
public class TestCell
{  
 /**
  * Checks to see if we change the LifeForm held by the Cell that
  * getLifeForm properly responds to this change.
  */
  @Test
  public void testSetLifeForm()
  {
  LifeForm bob = new LifeForm("Bob", 40);
  LifeForm fred = new LifeForm("Fred", 40);
  Cell cell = new Cell();
  // The cell is empty so this should work.
  boolean success = cell.addLifeForm(bob);
  assertTrue(success);
  assertEquals(bob,cell.getLifeForm());
  // The cell is not empty so this should fail.
  success = cell.addLifeForm(fred);
  assertFalse(success);
  assertEquals(bob,cell.getLifeForm());
  } 
}

Cell.java:

/**
* A Cell that can hold a LifeForm.
*
*/
public class Cell
{
LifeForm myLifeForm;
//unsure about the instance variable

 /**
 * Tries to add the LifeForm to the Cell. Will not add if a
 * LifeForm is already present.
 * @return true if the LifeForm was added the Cell, false otherwise.
 */
  public boolean addLifeForm(LifeForm entity)
  {
  return true;
  //modify instance variable
  }


  /**
   * @return the LifeForm in this Cell.
   */
   public LifeForm getLifeForm()
   {
  return myLifeForm;
  //return instance variable
   }

}

Answer 1

您有两行 assertEquals(bob,cell.getLifeForm()); 行。

在第一个中，如果您在 addLifeForm 方法中执行 this.myLifeForm =entity ，那么它将通过。在第二个中，如果您在 addLifeForm 方法中执行 if (this.myLifeForm == null) this.myLifeForm =entity ，那么它将通过。

就您而言，我会说测试工作正常，也就是说，它捕获了实现错误。