AssertJ：是什么containsOnly和containsExactlyInAnyOrder

Question

AbstractIterableAssert#containsOnly之间的区别说：

验证实际组只包含给定值，没有别的，以任何顺序。

AbstractIterableAssert#containsExactlyInAnyOrder说：

验证实际组包含以任何顺序一个与给定值，没有别的，。

的描述看起来几乎一样，所以是什么只有和正是之间的实际差异？

Answer 1

的实际差异事情只有当预期与实际的集合/列表包含重复：

• containsOnly总是重复在敏感：它永远不会失败，如果套料/实际的值匹配

• containsExactlyInAnyOrder始终是重复的敏感：失败，如果预期/实际元素的数量是不同的

虽然，他们都失败，如果：

• 至少一个预期唯一值是缺少实际的集合

• 并非每一个独特来自实际收集的值被断言

见例如：

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 
    }); 
}