babakfp•6mo ago

What does this library "assert" does?

Hi https://deno.land/std@0.215.0/assert/mod.ts What does it do in this example? https://docs.deno.com/runtime/manual/advanced/jsx_dom/deno_dom#basic-example

Using deno-dom with Deno | Deno Docs

deno-dom is an implementation of DOM and HTML

2 Replies

Deno AI Helper•6mo ago

Hello! The assert library in Deno provides a set of assertion functions that you can use in your tests to validate conditions. These assertions are used to ensure that your code behaves as expected during testing. In the context of the example you're referring to, the assert function is not directly used. However, I can explain how the assert function typically works based on the documentation. The assert method is a simple "truthy" assertion and can be used to assert any value which can be inferred as true. Here's a basic example from the documentation:

import { assert } from "https://deno.land/std@0.215.0/assert/mod.ts";

Deno.test("Test Assert", () => {
  assert(1); // Passes because 1 is truthy
  assert("Hello"); // Passes because a non-empty string is truthy
  assert(true); // Passes because true is truthy
});

import { assert } from "https://deno.land/std@0.215.0/assert/mod.ts";

Deno.test("Test Assert", () => {
  assert(1); // Passes because 1 is truthy
  assert("Hello"); // Passes because a non-empty string is truthy
  assert(true); // Passes because true is truthy
});

In this example, the assert function is used within a test case to check if the given expressions are truthy. If any of the expressions evaluate to a falsy value, the test will fail. The assert module provides several other assertion functions as well, such as assertEquals, assertNotEquals, assertStrictEquals, and more, which allow for more specific types of checks. If you have any more questions about testing or assertions in Deno, feel free to ask! 🦕

Helpful Links: Assertions | Deno Docs Documentation Tests | Deno Docs Using jsdom with Deno | Deno Docs Configuring JSX in Deno | Deno Docs

iuioiua•6mo ago

std/assert contains functions that ensure that particular conditions are met. If a condition isn’t met, an error is thrown. These functions are good for and mostly used in testing by ensuring APIs behave as expected.