Register a test which will be run when deno test is used on the command line and the containing module looks like a test module. fn can be async if required.

import {assert, fail, assertEquals} from "https://deno.land/std/testing/asserts.ts";

Deno.test({
  name: "example test",
  fn(): void {
    assertEquals("world", "world");
  },
});

Deno.test({
  name: "example ignored test",
  ignore: Deno.build.os === "windows",
  fn(): void {
    // This test is ignored only on Windows machines
  },
});

Deno.test({
  name: "example async test",
  async fn() {
    const decoder = new TextDecoder("utf-8");
    const data = await Deno.readFile("hello_world.txt");
    assertEquals(decoder.decode(data), "Hello world");
  }
});

Register a test which will be run when deno test is used on the command line and the containing module looks like a test module. fn can be async if required.

import {assert, fail, assertEquals} from "https://deno.land/std/testing/asserts.ts";

Deno.test("My test description", ():void => {
  assertEquals("hello", "hello");
});

Deno.test("My async test description", async ():Promise<void> => {
  const decoder = new TextDecoder("utf-8");
  const data = await Deno.readFile("hello_world.txt");
  assertEquals(decoder.decode(data), "Hello world");
});