interface TestEnvironment {
  fetch: typeof globalThis.fetch
}
interface TestTargetResult<Outcome=unknown,Pointer=unknown> {
  type?: "TestResult"
  outcome: Outcome
  name: string
  pointer: Pointer
}
export interface TestResult <
  Input=unknown,
  Outcome=unknown,
  Pointer=unknown,
> {
  type?: "TestResult"
  info?: string
  outcome: Outcome
  source?: TestTargetResult<Outcome,Pointer>
}

export interface TestCase<
  Input=unknown,
  Outcome=unknown,
> {
  applicability?: string // https://www.w3.org/TR/act-rules-format/#applicability
  assumptions?: string // https://www.w3.org/TR/act-rules-format/#assumptions
  attributedTo?: Array<string|{ name: string, url?: URL }>
  description: string
  expectations?: string // https://www.w3.org/TR/act-rules-format/#expectations
  failedCases?: Iterable<TestCaseExample<"failed">>
  inapplicableCases?: Iterable<TestCaseExample<"inapplicable">>
  input: { [I in keyof Input]: InputDescription}
  isPartOf?: Iterable<URL>
  markdown?: string
  name: string
  passedCases?: Iterable<TestCaseExample<"passed">>
  requirementReference?: Iterable<{ id: URL, url?: URL }>
  run: (inputs: Input, env?: TestEnvironment) => Promise<TestResult<Outcome>>
  slug: string
  testCases?: Iterable<TestCaseExample<Input>>
  url: URL
  uuid: string
}

interface InputDescription {
  help: string
  required?: boolean
  default?: unknown
  type?: string | string[]
  rangeIncludes?: string[]
  constraints?: unknown[]
}

interface TestCaseExample <
Input=unknown,
Outcome=unknown,
> {
  name: string
  id?: string
  input: Input
  result: TestResult<Outcome>
  targets?: unknown
}