Java JUnit4:使简单的 assertEquals 测试通过

Java JUnit4: Make simple assertEquals Test pass

我正在尝试使用 assertEquals pass 进行简单测试——在我的例子中:assertEquals(bob,cell.getLifeForm());.

第一次测试assertTrue(success);有效,意味着布尔成功 = 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;所以 Cell class 可以跟踪 LifeForm,现在我需要 return getLifeForm() 中的实例变量以及更新 addLifeForm 以正确修改实例变量(这个有问题) .谢谢你。

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
   }

}

你有两条 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。

在你的情况下,我会说测试工作正常,也就是说,它捕获了一个实现错误。