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Possible to do slowMo for just a single test?

Test DebuggingPlaywright
dman777posted in #help-playwright
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dman777

The test code below only passes when I do slowMo=1000 in headless. I know I am not supposed to use slowMo, but I am going by all the recommendations by playwright and it still only passes with slowMo. Is there a way to do just slowMo for a single test so I do not have to slow down the whole test suite?

Note: I am using mock data, not live data, so there is no lag in that respect.

it('should update max value in input box from slide adjustment and save', async({ page }) => {
        const responsePromise = page.waitForResponse(apiUrl);
        const targetPosition = { x: 100, y: 10 };
        const el = page.getByText('Match is probable');
        const el0 = page.locator('#mat-input-1');
  
        await page.getByRole('slider').nth(1).dragTo(el, {targetPosition});
        await expect(el0).toHaveAttribute('ng-reflect-model', '75');
  
        const response = await responsePromise;
        expect(response.url()).toContain('3924');
      });

This thread is trying to answer question "Is there a way to apply slowMo to a single test instead of the entire test suite?"

6 replies
butchmayhew
butchmayhew

If you are using the Playwright Test runner you can do this, along with overwriting the default timeout for your suite.

test("slow test", async ({ page }) => {
    test.slow();
    test.setTimeout(120_000);
    page.goto("url")
    ...
  });
dman777

thank you, I am using p test runner

dman777

it.slow(); isn't really helping. and I am not supposed to use waitForTimeout. Any ideas why?

it.only('should exit when save and exit button is pressed', async ({ page }) => {
        it.slow();
        await page.getByRole('button', { name: 'EDIT' }).click();                     
        await page.getByText('SAVE AND EXIT', { exact: true }).click();               
        expect(page.url()).toContain('http://127.0.0.1:8080/home');                   
      });
butchmayhew
butchmayhew

Can you link the docs for p test runner, first I’ve heard of this.

dman777

https://playwright.dev/docs/api/class-frame#frame-wait-for-timeout

Never wait for timeout in production. Tests that wait for time are inherently flaky. Use Locator actions and web assertions that wait automatically.

I am using locator actions and web assertions that wait. And it's what I been told on here before from @mxschmitt

dman777

I think playwright might have issues with the page transition animations in Angular ... if I was to guess some of these race condition issues? Or maybe just with Angular in general?

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Related Ask AI answer for "How do I apply the slowMo setting to a single test in Playwright?".

Answer

Sure, you can apply slowmo to just one test in Playwright! You can use the test.slow() method to mark a specific test as "slow". This gives it triple the default timeout. Here's how you do it:

import { test } from '@playwright/test';

test('slow test', async ({ page }) => {
  test.slow();
  // Your test code goes here
});

By using test.slow() in your test function, it gets more time to complete before timing out. But remember, you can't use test.slow() in a beforeAll or afterAll hook.

If you want to apply slowmo to all tests in a file or a test.describe() group, you can use the conditional version of test.slow(). Here's how:

import { test } from '@playwright/test';

test.slow(({ browserName }) => browserName === 'webkit');

test('slow in WebKit 1', async ({ page }) => {
  // Your code goes here
});

test('skip in WebKit 2', async ({ page }) => {
  // Your code goes here
});

In this case, all tests in this file or group will be "slow" if the condition browserName === 'webkit' is true. This lets you apply slowmo to specific tests based on certain conditions. So, with test.slow(), you can mark a specific test as "slow" or apply it conditionally to multiple tests.

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