Table of contents

Degraded state with soft assertions

If you want to monitor your API for non-critical errors or performance degradations you can use the degraded check state. This allows you to signal that parts of a Multistep check performed slower than expected, or that it triggered assertions that are of lower criticality.

The degraded state does not affect your check’s success ratio like a failed state does. You can configure alert channels to notifiy you when a check has degraded.

To catch errors that are relevant for a degraded scenario you can use soft assertions. Soft assertions keeps your Playwright test running after it has encountered an error, unlike regular assertions which terminate the test. See the playwright docs for more information on soft assertions.

To trigger a degraded state, checks use a helper library, @checkly/playwright-helpers, which is included in runtimes 2023.09 and later. The helper library contains two methods, markCheckAsDegraded and getAPIResponseTime.

Installing and importing

npm i @checkly/playwright-helpers

import { getAPIResponseTime, markCheckAsDegraded } from '@checkly/playwright-helpers'

const { getAPIResponseTime, markCheckAsDegraded } = require('@checkly/playwright-helpers')

markCheckAsDegraded

Marks a check as degraded if:

• The check is failing with soft assertions, or
• The check has no failures

Usage

    if (foo.length > 100) {
      markCheckAsDegraded('Foo is too long.')
    }

Arguments

• reason String (optional). Logged when the method is called. Used to identify which method caused the degradation.

getAPIResponseTime

Gets the request response time.

Usage

    if (getAPIResponseTime(response) > 100) {
      markCheckAsDegraded('Response was too slow.')
    }

Arguments

• response APIResponse (required). A response from a Playwright API request.

A check is marked as degraded when markCheckAsDegraded is called and there are no regular assertions triggered.

In this example we trigger a soft assertion if the API responsetime is too slow. We can get the response time by calling getAPIResponseTime with the request response as the parameter. At the end of the check we mark the check as degraded if any errors have been triggered during the test.

import { test, expect } from "@playwright/test"
import { getAPIResponseTime, markCheckAsDegraded } from "@checkly/playwright-helpers"

const baseUrl = "https://api.spacexdata.com/v3"

test("SpaceX-API Dragon Capsules & Next Launch", async ({ request }) => {
  await test.step("get all capsules", async () => {
    const response = await request.get(`${baseUrl}/dragons`)

    // Check 200 status code
    expect(response).toBeOK()
    
    // Check degraded status
    expect.soft(getAPIResponseTime(response), 'GET /dragons too slow').toBeLessThanOrEqual(200)

    return response.json()
  })

  // Trigger degraded state if check failed due to soft assertion
  if (test.info().errors.length) {
    markCheckAsDegraded('Check degraded due to soft assertion failure.')
  }
})

Note that if the check had used expect(getAPIResponseTime) instead of expect.soft it would have been considered failing instead of degraded. Similarly, if we use a soft assertion in the test, but remove the markCheckAsDegraded method at the end, the check would also be considered failing.

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Last updated on September 2, 2024. You can contribute to this documentation by editing this page on Github