jest-extended/dist/matchers/toChangeBy.js

Additional Jest matchers

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.toChangeBy = toChangeBy;
/**
 * Use `.toChangeBy` when checking if a value changed by an amount.
 */
function toChangeBy(mutator, checker, by = 1) {
    // @ts-expect-error OK to have implicit any for this.utils
    const { printReceived: print, matcherHint: hint } = this.utils;
    const before = checker();
    mutator();
    const after = checker();
    let received;
    if (typeof before === 'bigint' && typeof after === 'bigint') {
        received = after - before;
    }
    else {
        received = Number(after) - Number(before);
    }
    const passMessage = `
${hint('.not.toChangeBy', 'received', '')}\n\nExpected value to not change by ${by}, received:\n  ${print(received)}
`.trim();
    const failMessage = `
${hint('.toChangeBy', 'received', '')}\n\nExpected value to change by ${by}, received:\n  ${print(received)}
`.trim();
    const pass = received === by;
    return { pass, message: () => (pass ? passMessage : failMessage) };
}