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function assertThrows
assertThrows(fn: () => unknown,msg?: string): unknownDeprecated
(will be removed after 1.0.0) Import from https://deno.land/std/assert/assert_throws.ts instead.
Executes a function, expecting it to throw. If it does not, then it throws.
Examples
Example 1
Example 1
import { assertThrows } from "@std/testing/asserts"; assertThrows(() => { throw new TypeError("hello world!"); }); // Doesn't throw assertThrows(() => console.log("hello world!")); // Throws
Parameters
fn: () => unknownoptional
msg: stringReturn Type
unknownassertThrows<E extends Error = Error>(): EDeprecated
(will be removed after 1.0.0) Import from https://deno.land/std/assert/assert_throws.ts instead.
Executes a function, expecting it to throw. 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.
Examples
Example 1
Example 1
import { assertThrows } from "@std/testing/asserts"; assertThrows(() => { throw new TypeError("hello world!"); }, TypeError); // Doesn't throw assertThrows(() => { throw new TypeError("hello world!"); }, RangeError); // Throws