expect

import { expect } from "https://deno.land/x/expect/mod.ts";

expect(10).toEqual(10);
expect(Promise.resolve(20)).resolves.toEqual(20);

interface Expected {
  toBe(candidate: any, msg?: string): void;
  toEqual(candidate: any, msg?: string): void;
  toBeTruthy(msg?: string): void;
  toBeFalsy(msg?: string): void;
  toBeDefined(msg?: string): void;
  toBeInstanceOf(clazz: any, msg?: string): void;
  toBeUndefined(msg?: string): void;
  toBeNull(msg?: string): void;
  toBeNaN(msg?: string): void;
  toMatch(pattern: RegExp | string): void;
  toHaveProperty(propName: string, msg?: string): void;
  toHaveLength(length: number, msg?: string): void;
  toContain(item: any, msg?: string): void;
  toThrow(error?: RegExp | string, msg?: string): void;

  // comparison
  toBeGreaterThan(number: number, msg?: string): void;
  toBeGreaterThanOrEqual(number: number, msg?: string): void;
  toBeLessThan(number: number, msg?: string): void;
  toBeLessThanOrEqual(number: number, msg?: string): void;

  // mock calls
  toHaveBeenCalled(): void;
  toHaveBeenCalledTimes(times: number): void;
  toHaveBeenCalledWith(...args: any[]): void;
  toHaveBeenLastCalledWith(...args: any[]): void;
  toHaveBeenNthCalledWith(nth: number, ...args: any[]): void;
  toHaveReturnedWith(expected: any): void;
  toHaveReturned(): void;
  toHaveLastReturnedWith(expected: any): void;
  toHaveReturnedTimes(times: number): void;
  toHaveNthReturnedWith(nth:number, expected: any): void;

  not: Expected;
  resolves: Expected;
  rejects: Expected;
}