53 lines
2.2 KiB
JavaScript
53 lines
2.2 KiB
JavaScript
"use strict";
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var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.toHaveStyle = toHaveStyle;
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var _chalk = _interopRequireDefault(require("chalk"));
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var _utils = require("./utils");
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function getStyleDeclaration(document, css) {
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const styles = {};
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// The next block is necessary to normalize colors
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const copy = document.createElement('div');
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Object.keys(css).forEach(property => {
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copy.style[property] = css[property];
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styles[property] = copy.style[property];
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});
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return styles;
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}
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function isSubset(styles, computedStyle) {
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return !!Object.keys(styles).length && Object.entries(styles).every(([prop, value]) => computedStyle[prop] === value || computedStyle.getPropertyValue(prop.toLowerCase()) === value);
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}
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function printoutStyles(styles) {
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return Object.keys(styles).sort().map(prop => `${prop}: ${styles[prop]};`).join('\n');
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}
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// Highlights only style rules that were expected but were not found in the
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// received computed styles
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function expectedDiff(diffFn, expected, computedStyles) {
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const received = Array.from(computedStyles).filter(prop => expected[prop] !== undefined).reduce((obj, prop) => Object.assign(obj, {
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[prop]: computedStyles.getPropertyValue(prop)
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}), {});
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const diffOutput = diffFn(printoutStyles(expected), printoutStyles(received));
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// Remove the "+ Received" annotation because this is a one-way diff
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return diffOutput.replace(`${_chalk.default.red('+ Received')}\n`, '');
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}
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function toHaveStyle(htmlElement, css) {
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(0, _utils.checkHtmlElement)(htmlElement, toHaveStyle, this);
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const parsedCSS = typeof css === 'object' ? css : (0, _utils.parseCSS)(css, toHaveStyle, this);
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const {
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getComputedStyle
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} = htmlElement.ownerDocument.defaultView;
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const expected = getStyleDeclaration(htmlElement.ownerDocument, parsedCSS);
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const received = getComputedStyle(htmlElement);
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return {
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pass: isSubset(expected, received),
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message: () => {
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const matcher = `${this.isNot ? '.not' : ''}.toHaveStyle`;
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return [this.utils.matcherHint(matcher, 'element', ''), expectedDiff(this.utils.diff, expected, received)].join('\n\n');
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}
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};
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} |