143 lines
4.4 KiB
JavaScript
143 lines
4.4 KiB
JavaScript
'use strict';
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const { expect } = require('chai');
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const path = require('path');
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const fs = require('fs');
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const sinon = require('sinon');
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const { PDFKitTextMeasurer, QuickTextMeasurer } = require('./text-measurer');
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const { starRating } = require('./text-formatters');
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const defaults = require('./defaults');
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const testHelpers = require('./make-badge-test-helpers');
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const almostEqual = require('almost-equal');
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const EPSILON_PIXELS = 1e-3;
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describe('PDFKitTextMeasurer with DejaVu Sans', function () {
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it('should produce the same length as before', function () {
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const measurer = new PDFKitTextMeasurer(testHelpers.font.path);
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expect(measurer.widthOf('This is the dawning of the Age of Aquariums'))
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.to.equal(243.546875);
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});
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});
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function registerTests(fontPath, skip) {
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// Invoke `.skip()` within the `it`'s so we get logging of the skipped tests.
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const displayName = path.basename(fontPath, path.extname(fontPath));
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describe(`QuickTextMeasurer with ${displayName}`, function () {
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let quickMeasurer;
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if (! skip) {
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before(function () {
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// Since this is slow, share it across all tests.
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quickMeasurer = new QuickTextMeasurer(fontPath);
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});
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}
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let sandbox;
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let pdfKitWidthOf;
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let pdfKitMeasurer;
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if (! skip) {
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// Boo, the sandbox doesn't get cleaned up after a skipped test.
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beforeEach(function () {
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// This often times out: https://circleci.com/gh/badges/shields/2786
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this.timeout(5000);
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sandbox = sinon.sandbox.create();
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pdfKitWidthOf = sandbox.spy(PDFKitTextMeasurer.prototype, 'widthOf');
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pdfKitMeasurer = new PDFKitTextMeasurer(fontPath);
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});
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afterEach(function () {
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if (sandbox) {
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sandbox.restore();
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sandbox = null;
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}
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});
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}
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context('when given ASCII strings', function () {
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const strings = [
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'This is the dawning of the Age of Aquariums',
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'v1.2.511',
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'5 passed, 2 failed, 1 skipped',
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'[prismic "1.1"]',
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];
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strings.forEach(function (str) {
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it(`should measure '${str}' in parity with PDFKit`, function () {
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if (skip) { this.skip(); }
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expect(quickMeasurer.widthOf(str))
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.to.be.closeTo(pdfKitMeasurer.widthOf(str), EPSILON_PIXELS);
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});
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});
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strings.forEach(function (str) {
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it(`should measure '${str}' without invoking PDFKit`, function () {
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if (skip) { this.skip(); }
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quickMeasurer.widthOf(str);
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expect(pdfKitWidthOf).not.to.have.been.called;
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});
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});
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context('when the font includes a kerning pair', function () {
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const stringsWithKerningPairs = [
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'Q-tips', // In DejaVu, Q- is a kerning pair.
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'B-flat', // In Verdana, B- is a kerning pair.
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];
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function widthByMeasuringCharacters(str) {
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let result = 0;
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for (const char of str) {
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result += pdfKitMeasurer.widthOf(char);
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}
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return result;
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}
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it(`should apply a width correction`, function () {
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if (skip) { this.skip(); }
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const adjustedStrings = [];
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stringsWithKerningPairs.forEach(str => {
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const actual = quickMeasurer.widthOf(str);
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const unadjusted = widthByMeasuringCharacters(str);
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if (!almostEqual(actual, unadjusted, EPSILON_PIXELS)) {
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adjustedStrings.push(str);
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}
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});
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expect(adjustedStrings).to.be.an('array').that.is.not.empty;
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});
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});
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});
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context('when given non-ASCII strings', function () {
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const strings = [
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starRating(3.5),
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'\u2026',
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];
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strings.forEach(function (str) {
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it(`should measure '${str}' in parity with PDFKit`, function () {
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if (skip) { this.skip(); }
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expect(quickMeasurer.widthOf(str))
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.to.be.closeTo(pdfKitMeasurer.widthOf(str), EPSILON_PIXELS);
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});
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});
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strings.forEach(function (str) {
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it(`should invoke the base when measuring '${str}'`, function () {
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if (skip) { this.skip(); }
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quickMeasurer.widthOf(str);
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expect(pdfKitWidthOf).to.have.been.called;
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});
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});
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});
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});
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};
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// i.e. Verdana
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registerTests(defaults.font.path, !fs.existsSync(defaults.font.path));
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// i.e. DejaVu Sans
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registerTests(testHelpers.font.path);
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