Create a Node.js built-in test for an async helper and wire it to `npm test`.
Write a first regression test for an async discount helper using Node's built-in test runner. Scenario -> act -> assert -> script. The novice move is to test that the function exists or to print the result. That proves almost nothing about the business behavior that broke. Step 1 Import test from node:test and assert from node:assert/strict. The built-in runner and assertion library are enough for a focused first test. Step 2 Name the behavior: test('applies returning customer discount once', async () => { ... }). The test name should describe the promise the code must keep. Step 3 Call…
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