javascript - 如何测试数组是否包含数组？ ( Jest )

Question

给定以下函数:

chunk = (arr, n) => {
    return arr.reduce(function(p, cur, i) {
        (p[i/n|0] = p[i/n|0] || []).push(cur);
        return p;
    }, []);
}

我想测试输出数组是否包含数组:

test("Splits a given array in N arrays", () => {
    let _input = Array.from({length: 999}, () => Math.floor(Math.random() * 999));;
    let int = mockService.getRandomArbitrary();
    expect(generalService.chunk(_input, int)).toContain(???????);
})

考虑matchers ，如何测试一个数组是否包含数组？

Answer 1

可能是这样的？

我们使用Array.isArray()(此处为docs)来测试每个元素

let output = generalService.chunk(_input, int));
let containArrays = true;
if (output.length) {
    output.forEach(element => {
        // containArrays is false if one of the element is *not* an array
        if (Array.isArray(element) === false) containArrays = false;
    });
}
// if output is an empty array it doesn't contain arrays
else containArrays = false;

expect(containArrays).toBeTruthy();