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Playwright Test
Keep your Playwright tests and add danwo's emulators, invariants and fault matrix to them.
Already have a Playwright suite? You don't have to rewrite it. @danwo/playwright runs your
Playwright tests behind danwo's proxy and emulators, adds invariants, and runs the fault matrix
over a Playwright test.
Install it
npm install -D @danwo/playwrightIt works with @playwright/test 1.60 or newer, so you keep the version you have. The browser is
your own Playwright's, launched behind danwo's proxy. Install it the way you already do, with
npx playwright install chromium.
Point Playwright at your danwo config
import type { DanwoWorkerFixtures } from "@danwo/playwright"
import { defineConfig } from "@playwright/test"
export default defineConfig<object, Pick<DanwoWorkerFixtures, "danwoConfig">>({
use: { danwoConfig: "./danwo.config.ts" },
})Each Playwright worker starts the danwo config's environment() once. The browser runs behind its
proxy, and baseURL comes from it.
Write the test
Import testWith from @danwo/playwright and use it in place of Playwright's test function.
Everything Playwright gives you still works, plus a fixture named danwo:
import { expect, testWith } from "@danwo/playwright"
import type { StripeFixtures } from "@danwo/sdk"
const test = testWith<StripeFixtures>()
test("buys credits", async ({ page, danwo }) => {
await page.goto("/")
await page.getByRole("button", { name: "Buy 500 credits" }).click()
await page.getByTestId("checkout-pay").click()
await danwo.settle()
await expect(page.getByText("Credits: 500")).toBeVisible()
})danwo.settle() waits until Stripe's webhook has reached your app.
Add an invariant
test.invariant runs after every test in the file (or the describe block):
test.invariant(async ({ danwo, baseURL }) => {
const paid = await danwo.stripe.fetch(
new Request("https://api.stripe.com/v1/checkout/sessions?payment_status=paid"),
)
const { data } = await paid.json()
const granted = await (await fetch(`${baseURL}/api/credits`)).json()
expect(granted.credits).toBe(data.length * 500)
})What danwo holds
| Member | What it does |
|---|---|
danwo.stripe… | the environment's fixtures, by name |
settle() | waits for webhooks and the backend |
exchanges() | the calls recorded so far |
deliveries() | the webhooks delivered so far |
inject(label) | faults the next call or webhook matching the label |
clearFaults() | removes injected faults |
A failed test gets a danwo flight record attachment next to Playwright's trace.
Run the matrix
npx @danwo/playwright matrix tests/checkout.spec.tsclean run passed; 15 of 15 planned faults to run
PASS duplicate on webhook checkout.session.completed
PASS reset-after on POST api.stripe.com/v1/checkout/sessions
faults: 15 passedNarrow it with --grep (the test) and --faults (the fault labels).