What is the best way to find a partial string match within an array of objects when using Jest?

Question

What is the best way to find a partial string match within an array of objects when using Jest?

I am currently utilizing the following versions:

Node.js: 9.8.0
Jest: 22.4.2

A function called myFunction is returning an array structured like this:

[
    ...
    {
        id: 00000000,
        path: "www.someUrl.com/some/path/to"
    }
    ...
]

I am trying to compare it with a similar array structure like below:

const output = [
    ...
    {
        id: 00000000,
        path: "path/some/path/to"
    }
    ...
]

In essence, I need the id values to match exactly, but only partially match the path.

However, I'm having some difficulty implementing this... I attempted using the code snippet below:

expect(myFunction()).toEqual(expect.arrayContaining(output));

But unfortunately, this approach is resulting in an error.

javascript typescript jestjs

Answer 1

Answer №1

Here is the code I used to solve the problem:

const result = JSON.parse(readFileSync('./myFunction.json', 'utf8'));

describe('Testing myFunction.', () => {
    test('Default test.', () => {
        const inputData = myFunction();

        inputData.map((val, i) => {
            const { imgURL, ...rest } = result[i];

            expect(val).toMatchObject({
                ...rest,
                imageURL: expect.stringContaining(imgURL),
            });
        });
    });
});

Answer 2

Here is the code I used to solve the problem:

const result = JSON.parse(readFileSync('./myFunction.json', 'utf8'));

describe('Testing myFunction.', () => {
    test('Default test.', () => {
        const inputData = myFunction();

        inputData.map((val, i) => {
            const { imgURL, ...rest } = result[i];

            expect(val).toMatchObject({
                ...rest,
                imageURL: expect.stringContaining(imgURL),
            });
        });
    });
});

What is the best way to find a partial string match within an array of objects when using Jest?

Answer №1

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