chore: convert @packages/launcher tests from mocha to vitest

[AtofStryker]

• Closes N/A

Additional details

Converts the @packages/launcher tests to vitest from mocha.

Snapshots

snapshots should mostly be 1:1 but the vitest snapshots do include the versionRegex. The findAppParams snapshot values in the windows snapshot are not present because we do not actually calculate these values in the code for windows. They look like they came from the MacOS detector at some point due to the values populated in the snapshot, all to say these are not expected to be carried over into the new snapshots.

Tests

A lot of the detector tests needed to be reworked as we can longer leverage withArgs or callsArgAsync, so many of the mocking around the child process leverages callback handlers that are defined in the test to get a specific outcome from the yielding process.

We no longer stub utils.getOutput or helper methods and instead mock the libraries they are consuming, such as 'child_process' or 'win-version-info' to more accurately test our implementation.

This tests the same functionality, except maybe slightly deeper, but overall the tests are the same

Implementation

Only thing that has really changed with the implementation is to always prioritize 64-bit browser installs over 32-bit. Before, the priority was mixed and this makes the prioritization consistent

Steps to test

How has the user experience changed?

PR Tasks

• Have tests been added/updated?
• Has a PR for user-facing changes been opened in cypress-documentation?
• Have API changes been updated in the type definitions?

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Note

Migrates @packages/launcher tests to Vitest with new snapshots/config, refactors darwin/windows utilities, and updates CI/browser-tools and docs.

• @packages/launcher (tests):
  • Migrate unit tests from mocha/chai/sinon to vitest; add vitest.config.ts and new __snapshots__ under test/unit/**.
  • Remove legacy mocha.opts, spec_helper.ts, and old snapshot files.
  • Update package.json scripts (test-unit -> vitest run, add test-debug) and devDeps (add vitest, drop mocha/chai/sinon).
• Launcher utilities:
  • lib/darwin/util.ts: switch to default imports for fs-extra, path, plist.
  • lib/windows/index.ts: use fs-extra default import; reorder Chrome/Chromium path preferences; use fs.pathExists; call local getVersionString directly.
• CI:
  • Bump CircleCI browser-tools orb to 2.3.1; for Chrome install set replace_existing: true.
  • Adjust unit test Mocha results expectation from 10 to 9.
• Docs:
  • Update ESM migration guide to mark packages/launcher as completed.

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[cypress]

cypress    Run #66230

Run Properties:   Failed #66230  •  1b1de360d5: chore: fix detect spec to use actual implementation of cp.spawn

Project	cypress
Branch Review	chore/launcher_vitest
Run status	Failed #66230
Run duration	19m 59s
Commit	1b1de360d5: chore: fix detect spec to use actual implementation of cp.spawn
Committer	Bill Glesias
View all properties for this run ↗︎

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Test results
Failures	1
Flaky	9
Pending	1102
Skipped	4
Passing	26690
View all changes introduced in this branch ↗︎

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Warning

Partial Report: The results for the Application Quality reports may be incomplete.

UI Coverage  45.24%
Untested elements	185
Tested elements	157

Accessibility  97.96%
Failed rules	4 critical   8 serious   2 moderate   2 minor
Failed elements	101

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Tests for review

  cypress/e2e/studio/studio.cy.ts • 1 failed test • app-e2e

View Output

Test		Artifacts
Cypress Studio > creates a new test from an empty spec		Test Replay Screenshots

  issues/28527.cy.ts • 1 flaky test • 5x-driver-electron

View Output

Test		Artifacts
issue 28527 > fails and then retries and verifies about:blank is not displayed		Test Replay Screenshots

  commands/files.cy.js • 1 flaky test • 5x-driver-firefox

View Output

Test		Artifacts
src/cy/commands/files > #readFile > retries to read when ENOENT		</td> </tr></table>   e2e/origin/config_env.cy.ts • 1 flaky test • 5x-driver-firefox View Output Test Artifacts cy.origin- Cypress.config() > serializable > overwrites different values in secondary if one exists in the primary </td> </tr></table>   issues/28527.cy.ts • 1 flaky test • 5x-driver-firefox View Output Test Artifacts issue 28527 > fails and then retries and verifies about:blank is not displayed Screenshots   issues/28527.cy.ts • 1 flaky test • 5x-driver-chrome View Output Test Artifacts issue 28527 > fails and then retries and verifies about:blank is not displayed Test Replay Screenshots The first 5 flaky specs are shown, see all 9 specs in Cypress Cloud.