Testing / Playwright Interview questions
How do you run tests in parallel in Playwright?
Playwright Test parallelizes by default, splitting test files (not individual tests within a file, unless configured) across multiple worker processes, each with its own browser instance.
// playwright.config.ts export default defineConfig({ workers: 4, fullyParallel: true, });
The workers option caps how many processes run at once, and defaults to roughly half the available CPU cores locally, or 1 on CI unless overridden. Setting fullyParallel: true goes further and parallelizes individual tests within the same file too, rather than only across files, which speeds up suites where one file contains many independent tests.
Because each test gets its own isolated browser context by default, this parallelism doesn't introduce shared-state race conditions the way parallel Selenium suites often do without extra setup.
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