102 lines
3.3 KiB
TypeScript
102 lines
3.3 KiB
TypeScript
/*
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Copyright 2022 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/// <reference types="cypress" />
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import "cypress-axe";
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import * as axe from "axe-core";
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import { Options } from "cypress-axe";
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import Chainable = Cypress.Chainable;
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function terminalLog(violations: axe.Result[]): void {
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cy.task(
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"log",
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`${violations.length} accessibility violation${violations.length === 1 ? "" : "s"} ${
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violations.length === 1 ? "was" : "were"
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} detected`,
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);
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// pluck specific keys to keep the table readable
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const violationData = violations.map(({ id, impact, description, nodes }) => ({
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id,
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impact,
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description,
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nodes: nodes.length,
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}));
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cy.task("table", violationData);
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}
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Cypress.Commands.overwrite(
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"checkA11y",
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(
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originalFn: Chainable["checkA11y"],
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context?: string | Node | axe.ContextObject | undefined,
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options: Options = {},
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violationCallback?: ((violations: axe.Result[]) => void) | undefined,
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skipFailures?: boolean,
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): void => {
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return originalFn(
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context,
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{
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...options,
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rules: {
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// Disable contrast checking for now as we have too many issues with it
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"color-contrast": {
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enabled: false,
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},
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...options.rules,
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},
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},
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violationCallback ?? terminalLog,
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skipFailures,
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);
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},
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);
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// Load axe-core into the window under test.
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//
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// The injectAxe in cypress-axe attempts to load axe via an `eval`. That conflicts with our CSP
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// which disallows "unsafe-eval". So, replace it with an implementation that loads it via an
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// injected <script> element.
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Cypress.Commands.overwrite("injectAxe", (originalFn: Chainable["injectAxe"]): void => {
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Cypress.log({ name: "injectAxe" });
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// load the minified axe source, and create an intercept to serve it up
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cy.readFile("node_modules/axe-core/axe.min.js", { log: false }).then((source) => {
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cy.intercept("/_axe", source);
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});
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// inject a script tag to load it
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cy.get("head", { log: false }).then(
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(head) =>
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new Promise((resolve, reject) => {
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const script = document.createElement("script");
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script.type = "text/javascript";
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script.async = true;
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script.onload = resolve;
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script.onerror = (_e) => {
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// Unfortunately there does not seem to be a way to get a reason for the error.
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// The error event is useless.
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reject(new Error("Unable to load axe"));
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};
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script.src = "/_axe";
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head.get()[0].appendChild(script);
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}),
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);
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});
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