android中單元測試中的斷言assert的使用與擴展

首先看一組對照，比方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。使用上更加方便。

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>

所以接下來我們來看看  Assert Android怎樣來使用。

1首先寫一個待測試的數據結構

 public class Draft{

      private String id;//草稿的唯一標識id 
      private String uid ;//發送賬號uid，以差別不同賬號的草稿
      private int type;//保存的類型

      private String displayedTitle;//展示標題內容

}

2 \首先我們來自己定義一個斷言類:

   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");

     假設導入DraftAssert.assertThat靜態導入的話，你還能夠直接使用

     assertThat(draft).hasDisplayedName("@羅浩");