How to access jest's assert functions in a custom matcher

[amirsaleem-kn]

💬 Question

I am writing a custom matcher for my own API response schema. I want to use jest's built-in assert functions inside my custom matcher so that I don't have to write my own test functions inside my custom matcher. Here is my code

expect.extend({
    toContainValidAPIResponseBody(received, argument) {

        const pass = this.toMatchObject({
            data: expect.any(Array),
            errors: expect.any(Array),
            status: expect.any(String)
        });

        const message = () => (`expected ${this.utils.printReceived(received)} to be a valid Farmer Backend API Response`);

        if (pass) {
            return {
                message,
                pass: true
            };
        } else {
            return {
                message,
                pass: false
            };
        }
    }
});

The problem is that this.toMatchObject is not a valid statement. Is there a way to access functions like toMatchObject inside a custom matcher?

[SimenB]

that's not currently possible. However, I like the idea. Wanna send a PR for it? 🙂

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