Deno.DenoTest | Runtime APIs

import { assertEquals } from "jsr:@std/assert";

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

Deno.test({
  name: "example ignored test",
  ignore: Deno.build.os === "windows",
  fn() {
    // 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");
  }
});

(name: string, fn: (t: TestContext) => void | Promise<void>): void

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 { assertEquals } from "jsr:@std/assert";

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

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

(fn: (t: TestContext) => void | Promise<void>): void

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. Declared function must have a name.

import { assertEquals } from "jsr:@std/assert";

Deno.test(function myTestName() {
  assertEquals("hello", "hello");
});

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

(

options: Omit<TestDefinition, "fn" | "name">,

fn: (t: TestContext) => void | Promise<void>,

): void

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 "jsr:@std/assert";

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

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

(options: Omit<TestDefinition, "fn" | "name">, fn: (t: TestContext) => void | Promise<void>): void

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 { assertEquals } from "jsr:@std/assert";

Deno.test(
  {
    name: "My test description",
    permissions: { read: true },
  },
  () => {
    assertEquals("hello", "hello");
  },
);

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

(options: Omit<TestDefinition, "fn">, fn: (t: TestContext) => void | Promise<void>): void

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. Declared function must have a name.

import { assertEquals } from "jsr:@std/assert";

Deno.test(
  { permissions: { read: true } },
  function myTestName() {
    assertEquals("hello", "hello");
  },
);

Deno.test(
  { permissions: { read: false } },
  async function myOtherTestName() {
    const decoder = new TextDecoder("utf-8");
    const data = await Deno.readFile("hello_world.txt");
    assertEquals(decoder.decode(data), "Hello world");
  },
);