feat(mstest,nunit): add LaunchOptionsAsync override#3321
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Allow overriding browser launch options from test code, mirroring the xUnit.v3 harness. Adds a virtual LaunchOptionsAsync() to BrowserTest and threads the result through BrowserService so it takes precedence over PlaywrightSettingsProvider.LaunchOptions when set. Fixes microsoft#3315
pavelfeldman
approved these changes
Jun 4, 2026
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Summary
LaunchOptionsAsync()to the MSTest and NUnitBrowserTestharnesses, letting tests override browser launch options from code (e.g. toggle headed/headless) instead of only via env vars /.runsettings.BrowserServiceand takes precedence overPlaywrightSettingsProvider.LaunchOptionswhen non-null.Playwright.MSTest.v4picks this up automatically since it compiles the MSTest sources.Fixes #3315