30 lines
840 B
JavaScript
30 lines
840 B
JavaScript
import assertionWrapper from './assertion-wrapper.js';
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const NEAR_ZERO = 5e-6; // 0.000005, Firefox fails at higher levels of precision.
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/**
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* Checks that the supplied values are equal with a high though not absolute degree of precision.
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* @param {Float} actual
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* @param {Float} expected
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* @param {string} message
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* @returns {void}
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*/
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function almostEquals (actual, expected, message) {
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message = message || (actual + ' did not equal ' + expected);
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const result = Math.abs(actual - expected) < NEAR_ZERO;
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return {result, message, actual, expected};
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}
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/**
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* @param {external:chai} _chai
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* @param {external:chai_utils} utils
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* @returns {void}
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*/
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function setAssertionMethods (_chai, utils) {
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const wrap = assertionWrapper(_chai, utils);
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assert.almostEquals = wrap(almostEquals);
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}
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export default setAssertionMethods;
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