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Use Argos with Playwright

Integrating Argos with your Playwright tests to enable visual testing on your application.

Playwright already offers a command to take screenshots. The official Argos Playwright integration uses it but also does several things:

  • Wait for all images to be loaded
  • Wait for all fonts to be loaded
  • Wait for no aria-busy (loader) elements to be present in the page
  • Hide scrollbars
  • Hide carets
  • Expose CSS helpers to help you hiding content

1. Setup​

npm install --save-dev @argos-ci/playwright @playwright/test

2. Use in your tests​

argosScreenshot command stabilizes the UI and takes a screenshot.

How to take a screenshot with argosScreenshot command

import { test } from "@playwright/test";
import { argosScreenshot } from "@argos-ci/playwright";

test.describe("Homepage", () => {
  test("take screenshot", async ({ page }) => {
    await page.goto(TEST_URL);
    await argosScreenshot(page, "homepage");
  });
});

Screenshots are stored in ./screenshots folder.

3. Upload screenshots to Argos​

Look at Argos doc to know how to configure your CI to send screenshots to Argos.

API​

argosScreenshot(page, name[, options])​

  • page - A playwright page instance
  • name - The screenshot name; must be unique
  • options - See Page.screenshot command options
  • options.element - Accept an ElementHandle or a string selector to screenshot an element

Helper attributes​

The data-visual-test attributes allow you to control how elements behave in the Argos screenshot.

It is often used to hide changing element like dates.

  • [data-visual-test="transparent"] - Make the element transparent (opacity: 0)
  • [data-visual-test="removed"] - Remove the element (display: none)

How to use an helper to hide a div from a screenshot

<div id="clock" data-visual-test="transparent">...</div>

Resources​