openmct/e2e/tests/visual/default.spec.js

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/*
Collection of Visual Tests set to run in a default context. These should only use functional
expect statements to verify assumptions about the state in a test and not for functional
verification of correctness.
Note: Larger testsuite sizes are OK due to the setup time associated with these tests. Visual
tests are not supposed to "fail" on assertions.
*/

const { test, expect } = require('@playwright/test');
const percySnapshot = require('@percy/playwright');
const path = require('path');
const sinon = require('sinon');

const VISUAL_GRACE_PERIOD = 5 * 1000; //Lets the application "simmer" before the snapshot is taken

// Snippet from https://github.com/microsoft/playwright/issues/6347#issuecomment-965887758
// Will replace with cy.clock() equivalent
test.beforeEach(async ({ context }) => {
    await context.addInitScript({
        // eslint-disable-next-line no-undef
        path: path.join(__dirname, '../../..', './node_modules/sinon/pkg/sinon.js')
    });
    await context.addInitScript(() => {
        window.__clock = sinon.useFakeTimers(); //Set browser clock to UNIX Epoch
    });
});

test('Visual - Root and About', async ({ page }) => {
    // Go to baseURL
    await page.goto('/', { waitUntil: 'networkidle' });

    // Verify that Create button is actionable
    const createButtonLocator = page.locator('button:has-text("Create")');
    await expect(createButtonLocator).toBeEnabled();

    // Take a snapshot of the Dashboard
    await page.waitForTimeout(VISUAL_GRACE_PERIOD);
    await percySnapshot(page, 'Root');

    // Click About button
    await page.click('.l-shell__app-logo');

    // Modify the Build information in 'about' to be consistent run-over-run
    const versionInformationLocator = page.locator('ul.t-info.l-info.s-info');
    await expect(versionInformationLocator).toBeEnabled();
    await versionInformationLocator.evaluate(node => node.innerHTML = '<li>Version: visual-snapshot</li> <li>Build Date: Mon Nov 15 2021 08:07:51 GMT-0800 (Pacific Standard Time)</li> <li>Revision: 93049cdbc6c047697ca204893db9603b864b8c9f</li> <li>Branch: master</li>');

    // Take a snapshot of the About modal
    await page.waitForTimeout(VISUAL_GRACE_PERIOD);
    await percySnapshot(page, 'About');
});