OptionalafterRuns once after a group's tests, like Vitest's afterAll or
node:test's after. Needed only with cleanup.
Groups tests, like Vitest's or node:test's describe.
Checks values: Vitest's expect, or assertExpect on node:assert.
Adds a test, like Vitest's or node:test's it.
The test functions a contract registers its tests with. Vitest's
describe,it,expect, andafterAllfit, and so donode:test'sdescribe,it, andafterwithassertExpect.