import { assertRejects } from "https://deno.land/x/oak@v14.1.1/test_deps.ts";
Executes a function which returns a promise, expecting it to reject.
To assert that a synchronous function throws, use assertThrows
.
Examples
Example 1
Example 1
import { assertRejects } from "https://deno.land/std@0.224.0/assert/assert_rejects.ts";
await assertRejects(async () => Promise.reject(new Error())); // Doesn't throw
await assertRejects(async () => console.log("Hello world")); // Throws
Executes a function which returns a promise, expecting it to reject. If it does not, then it throws. An error class and a string that should be included in the error message can also be asserted.
To assert that a synchronous function throws, use assertThrows
.
Examples
Example 1
Example 1
import { assertRejects } from "https://deno.land/std@0.224.0/assert/assert_rejects.ts";
await assertRejects(async () => Promise.reject(new Error()), Error); // Doesn't throw
await assertRejects(async () => Promise.reject(new Error()), SyntaxError); // Throws
Parameters
ErrorClass: new (...args: any[]) => E