android中单元测试中的断言assert的使用与扩展

首先看一组对比，比如说我们要测试的结果是一个Linearlaout  

• AssertJ Android:

  assertThat(layout).isVisible()
      .isVertical()
      .hasChildCount(4)
      .hasShowDividers(SHOW_DIVIDERS_MIDDLE);
        

• Regular JUnit:

  assertEquals(View.VISIBLE, layout.getVisibility());
  assertEquals(VERTICAL, layout.getOrientation());
  assertEquals(4, layout.getChildCount());
  assertEquals(SHOW_DIVIDERS_MIDDLE, layout.getShowDividers());
        

• Regular AssertJ:

  assertThat(layout.getVisibility()).isEqualTo(View.VISIBLE);
  assertThat(layout.getOrientation()).isEqualTo(VERTICAL);
  assertThat(layout.getChildCount()).isEqualTo(4);
  assertThat(layout.getShowDividers()).isEqualTo(SHOW_DIVIDERS_MIDDLE);      

从形式上，使用上更加方便。

从输出结果上看，输出结果更加直接可见。

• AssertJ Android:     

  Expected visibility <gone> but was <invisible>

  .
• Regular JUnit          Expected:<[8]> but was:<[4]>
• Regular AssertJ:     Expected: <8> but was: <4>

所以接下来我们来看看  Assert Android如何来使用。 1首先写一个待测试的数据结构  public class Draft{       private String id;//草稿的唯一标识id 

      private String uid ;//发送账号uid，以区别不同账号的草稿

      private int type;//保存的类型

      private String displayedTitle;//展示标题内容

} 2 \首先我们来自定义一个断言类:    public class DraftAssert extends AbstractAssert<DraftAssert ,Draft>{       public DraftAssert (Draft draft){        super(draft,DraftAssert.class);} }       public static DraftAssert  assertThat(Draft draft){       return new DraftAssert (draft);}    public DraftAssert  hasDisplayedName(String name){       isNotNull();       if (!draft.getDisplayedTitle().equals(name) ){       failWithMessage(("Expected character's name to be <%s> but was <%s>", name, draft.getDisplayedTitle());)       return this; } } 3、使用的时候      DraftAssert.assertThat(draft).hasDisplayedName("@罗浩");      如果导入DraftAssert.assertThat静态导入的话，你还可以直接使用      assertThat(draft).hasDisplayedName("@罗浩");