Server-specific tests should run w/ Jest testEnvironment: 'node'

[ziir]

Uncovered in https://github.com/mozilla/addons-frontend/pull/11593#discussion_r899031000. Some server-specific tests run w/ Jest's testEnvironment: 'jsdom', which is the project's Jest config default. As a result, some globals are missing or extraneous & test environment is not suited. This can be solved by either:

• splitting jsdom & node test environments w/ their own test command
• using testEnvironment: 'node' by default, and using the @jest-environment jsdom docblock when needed
• keeping testEnvironment: 'jsdom' by default, and using the @jest-environment node docblock when needed

See also:

• https://testing-library.com/docs/react-testing-library/setup#jest-28
• https://jestjs.io/docs/configuration#testenvironment-string

┆Issue is synchronized with this Jira Task

[KevinMind]

Old Jira Ticket: https://mozilla-hub.atlassian.net/browse/ADDFRNT-84