interface ILengthAble {
  length: number;
}

interface ITinytestAssertions {
  ok(doc: Object): void;
  expect_fail(): void;
  fail(doc: Object): void;
  runId(): string;
  equal<T>(actual: T, expected: T, message?: string, not?: boolean): void;
  notEqual<T>(actual: T, expected: T, message?: string): void;
  instanceOf(obj: Object, klass: Function, message?: string): void;
  notInstanceOf(obj: Object, klass: Function, message?: string): void;
  matches(actual: any, regexp: RegExp, message?: string): void;
  notMatches(actual: any, regexp: RegExp, message?: string): void;
  throws(f: Function, expected?: string | RegExp): void;
  isTrue(v: boolean, msg?: string): void;
  isFalse(v: boolean, msg?: string): void;
  isNull(v: any, msg?: string): void;
  isNotNull(v: any, msg?: string): void;
  isUndefined(v: any, msg?: string): void;
  isNotUndefined(v: any, msg?: string): void;
  isNan(v: any, msg?: string): void;
  isNotNan(v: any, msg?: string): void;
  include<T>(s: Array<T> | Object | string, value: any, msg?: string, not?: boolean): void;

  notInclude<T>(s: Array<T> | Object | string, value: any, msg?: string, not?: boolean): void;
  length(obj: ILengthAble, expected_length: number, msg?: string): void;
  _stringEqual(actual: string, expected: string, msg?: string): void;
}

declare module Tinytest {
  function add(description: string, func: (test: ITinytestAssertions) => void): void;
  function addAsync(description: string, func: (test: ITinytestAssertions) => void): void;
}