如何测试LinkedHashMap的值和键? [英] How to test values and keys of LinkedHashMap?

问题描述

我编写了一种方法，该方法将字符串的字符放入LinkedHashMap中作为键，并将该字符的数量作为值，但是我不知道如何测试该方法是否正确地计算了字符.

I wrote method which put chars of a string into LinkedHashMap as a key and quantity of that chars as value, but I don't know how can I test if this method properly count chars.

LinkedHashMap<Character, Integer> map = new LinkedHashMap<>();
for (int i = 0; i < string.length(); i++) {
    char wordToLetter = string.toLowerCase().charAt(i);
    if (map.containsKey(wordToLetter)) {
        int quantity = map.get(wordToLetter);
        map.put(wordToLetter, ++quantity);
    } else {
        map.put(wordToLetter, 1);
    }
}
return map;

输入示例:"abc de"

作为测试，我想检查我是否有一个字符"a".数量为1.

and as test I want to check if I have a char "a" with proper quantity 1.

推荐答案

下面给出的是一种测试方法:

Given below is a way to test it:

import static org.junit.jupiter.api.Assertions.assertEquals;

import java.util.LinkedHashMap;

public class Main {
    public static void main(String[] args) {
        LinkedHashMap<Character, Integer> charCountMap = output("abc de");
        assertEquals(1, charCountMap.get('a'));
        assertEquals(1, charCountMap.get('b'));
        assertEquals(1, charCountMap.get(' '));
    }

    public static LinkedHashMap<Character, Integer> output(String inputString) {
        LinkedHashMap<Character, Integer> map = new LinkedHashMap<>();
        for (int i = 0; i < inputString.length(); i++) {
            char wordToLetter = inputString.toLowerCase().charAt(i);
            if (map.containsKey(wordToLetter)) {
                int quantity = map.get(wordToLetter);
                map.put(wordToLetter, ++quantity);
            } else {
                map.put(wordToLetter, 1);
            }
        }
        return map;
    }
}

如果您输入其他值，例如assertEquals(2, charCountMap.get('a'));，它将引发AssertionFailedError异常.

If you put a different value e.g. assertEquals(2, charCountMap.get('a'));, it will throw AssertionFailedError exception.

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