使用测试用例 JUnit 5 比较 2 个 2D 数组

Question

我正在使用测试用例 (JUnit5) 将通过一系列方法生成的 2D 数组与我制作的应该相同的 2D 数组进行比较。

@Test
void testReadCorpus() {
    UserInterface UI = new UserInterface();
    Translator translator = new Translator();
    
    //For English to French translation
    translator.setCorpus("English-French.txt");
    translator.readCorpus();
    translator.printCorpus();
    String[][] corpusA = translator.getCorpus();
    String[][] corpusB = {
            {"the","le"},
            {"the","la"},
            {"jellyfish","meduse"},
            {"boy","garcon"},
            {"dances","danse"},
            {"with","avec"},
            {"lazy","paresseux"},
            {"s melly","puante"},
            {"dog","chien"},
            {"family","famille"},
            {"house","maison"},
            {"brother","frere"},
            {"sister","soeur"},
            {"food","aliments"},
            {"flower","fleur"},
            {"in","dans"},
    };
    assertEquals(corpusA, corpusB);

printCorpus 方法打印出 2D 数组 (corpusA)，每行通过换行分隔，每列用逗号分隔。输出如下：

the,le
the,la
jellyfish,meduse
boy,garcon
dances,danse
with,avec
lazy,paresseux
smelly,puante
dog,chien
family,famille
house,maison
brother,free
sister,soeur
food,aliments
flower,fleur
in,dans

据我所知，这两个数组是相同的，但在使用assertEqual运行测试用例时出现失败。有什么解决办法或想法吗？

更多背景： 我正在从事的项目是一个直译器。它逐字翻译句子。语料库是一个文件，其中包含一种语言的单词及其另一种语言的翻译，以逗号分隔。几乎就是您在上面看到的输出。我只是使用了 readCorpus() 方法来读取文本文件并将其内容存储在 2D 数组中。

Answer 1

您应该使用

assertArrayEquals

而不是

assertEquals

来断言深度数组相等。

@Test
void testReadCorpus() {
    UserInterface UI = new UserInterface();
    Translator translator = new Translator();
    
    //For English to French translation
    translator.setCorpus("English-French.txt");
    translator.readCorpus();
    translator.printCorpus();
    String[][] corpusA = translator.getCorpus();
    String[][] corpusB = {
            {"the","le"},
            {"the","la"},
            {"jellyfish","meduse"},
            {"boy","garcon"},
            {"dances","danse"},
            {"with","avec"},
            {"lazy","paresseux"},
            {"s melly","puante"},
            {"dog","chien"},
            {"family","famille"},
            {"house","maison"},
            {"brother","frere"},
            {"sister","soeur"},
            {"food","aliments"},
            {"flower","fleur"},
            {"in","dans"},
    };
    assertArrayEquals(corpusA, corpusB);

}

深层平等语义由

java.util.Arrays#deepEquals

合约规定：

如果两个数组引用都为 null，或者它们引用的数组包含相同数量的元素，并且两个数组中所有对应的元素对都深度相等，则认为两个数组引用深度相等。

Answer 2

我应该使用这种方法来比较数组

assertTrue(Arrays.deepEquals(corpusA, corpusB));

谢谢@tmarwern 的帮助

Answer 3

AssertJ 现在提供 Assertions.isDeepEquals，它可以提供更好的输出（请参阅 https://stackoverflow.com/a/66935173/411282）