Nano Spy

A tiny Node.js library to spy and mock methods in tests
with great TypeScript support.

It will take only 6 KB
in your node_modules and have 0 dependencies.

``js
import { spyOn, restoreAll } from 'nanospy'

test.after.each(() => {
restoreAll()
})

test('calls increase', () => {
const spy = spyOn(counter, 'increase')
counter.increase(5)
assert.equal(spy.callCount, 1)
assert.equal(spy.calls, [[5]])
})
``

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Docs

Read full docs here.