AssertJ：是什麼containsOnly和containsExactlyInAnyOrder

Question

AbstractIterableAssert#containsOnly之間的區別說：

驗證實際組只包含給定值，沒有別的，以任何順序。

AbstractIterableAssert#containsExactlyInAnyOrder說：

驗證實際組包含以任何順序一個與給定值，沒有別的，。

的描述看起來幾乎一樣，所以是什麼只有和正是之間的實際差異？

Answer 1

的實際差異事情只有當預期與實際的集合/列表包含重複：

• containsOnly總是重複在敏感：它永遠不會失敗，如果套料/實際的值匹配

• containsExactlyInAnyOrder始終是重複的敏感：失敗，如果預期/實際元素的數量是不同的

雖然，他們都失敗，如果：

• 至少一個預期唯一值是缺少實際的集合

• 並非每一個獨特來自實際收集的值被斷言

見例如：

private List<String> withDuplicates; 
private List<String> noDuplicates; 

@Before 
public void setUp() throws Exception { 
    withDuplicates = asList("Entryway", "Underhalls", "The Gauntlet", "Underhalls", "Entryway"); 
    noDuplicates = asList("Entryway", "Underhalls", "The Gauntlet"); 
} 

@Test 
public void exactMatches_SUCCESS() throws Exception { 
    // successes because these 4 cases are exact matches (bored cases) 
    assertThat(withDuplicates).containsOnly("Entryway", "The Gauntlet", "Underhalls", "Entryway", "Underhalls"); // 1 
    assertThat(withDuplicates).containsExactlyInAnyOrder("Entryway", "The Gauntlet", "Underhalls", "Entryway", "Underhalls"); // 2 

    assertThat(noDuplicates).containsOnly("Entryway", "The Gauntlet", "Underhalls"); // 3 
    assertThat(noDuplicates).containsExactlyInAnyOrder("Entryway", "The Gauntlet", "Underhalls"); // 4 
} 

@Test 
public void duplicatesAreIgnored_SUCCESS() throws Exception { 
    // successes because actual withDuplicates contains only 3 UNIQUE values 
    assertThat(withDuplicates).containsOnly("Entryway", "The Gauntlet", "Underhalls"); // 5 

    // successes because actual noDuplicates contains ANY of 5 expected values 
    assertThat(noDuplicates).containsOnly("Entryway", "The Gauntlet", "Underhalls", "Entryway", "Underhalls"); // 6 
} 

@Test 
public void duplicatesCauseFailure_FAIL() throws Exception { 
    SoftAssertions.assertSoftly(softly -> { 
     // fails because ["Underhalls", "Entryway"] are UNEXPECTED in actual withDuplicates collection 
     softly.assertThat(withDuplicates).containsExactlyInAnyOrder("Entryway", "The Gauntlet", "Underhalls"); // 7 

     // fails because ["Entryway", "Underhalls"] are MISSING in actual noDuplicates collection 
     softly.assertThat(noDuplicates).containsExactlyInAnyOrder("Entryway", "The Gauntlet", "Underhalls", "Entryway", "Underhalls"); // 8 
    }); 
}