Add `happy-dom` option to `unit-test` runner when using Vitest

[yjaaidi]

Command

test

Description

It would be nice to provide happy-dom as an environment option.

During the migration from karma, some might go with browser mode directly, some might transition through jsdom. When using jsdom, they might encounter issues that do not exist in happy-dom. (A typical example is event view verification, cf. vitest-dev/vitest#4685).
Also, some Jest users might be already using happy-dom so providing it as an option could make the migration smoother.

Describe the solution you'd like

No response

Describe alternatives you've considered

No response

[angular-robot]

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