Discovering the Bnlang Test Runner

The Bnlang Test Runner is the official tool for writing and running tests in the Bnlang ecosystem.
It provides a simple API for defining tests, assertions, and hooks, ensuring reliable and maintainable code.
With the test runner, you can automate quality checks and confidently refactor projects.

Writing a Simple Test

const { test } = require("bnl_test");

test("addition works", (t) => {
  t.equal(2 + 2, 4);
});

Assertions

Assertions are checks that confirm expected outcomes.
Common methods include t.equal, t.notEqual, t.ok, and t.fail.

Hooks

The runner supports lifecycle hooks:

• before → Runs once before all tests.
• after → Runs once after all tests.
• beforeEach → Runs before each test.
• afterEach → Runs after each test.

Example with Hooks

const { test } = require("bnl_test");

test.before(() => console.log("Setup"));
test.after(() => console.log("Teardown"));

test("check value", (t) => {
  const x = 10;
  t.ok(x > 5);
});

Best Practices

• Group related tests for readability.
• Keep test functions small and focused.
• Use hooks for setup/teardown logic.
• Automate tests in CI/CD pipelines for reliability.