Jest
describe
test or it
expect
beforeEach
only, skip
複数のdescribeは直列実行される
複数のtestはデフォルトでは並列実行される(--runInBand オプションをつけると直列実行)
Please note that we currently don't support jest.mock in a clean way in ESM, but that is something we intend to add proper support for in the future. Follow this issue for updates.