android中單元測試中的斷言assert的使用與擴充

首先看一組對比，比如說我們要測試的結果是一個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);      

從形式上，使用上更加友善。

從輸出結果上看，輸出結果更加直接可見。

• AssertJ Android:     

  Expected visibility <gone> but was <invisible>

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

是以接下來我們來看看  Assert Android如何來使用。 1首先寫一個待測試的資料結構  public class Draft{       private String id;//草稿的唯一辨別id 

      private String uid ;//發送賬号uid，以差別不同賬号的草稿

      private int type;//儲存的類型

      private String displayedTitle;//展示标題内容

} 2 \首先我們來自定義一個斷言類:    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、使用的時候      DraftAssert.assertThat(draft).hasDisplayedName("@羅浩");      如果導入DraftAssert.assertThat靜态導入的話，你還可以直接使用      assertThat(draft).hasDisplayedName("@羅浩");