eltro/test/sinon.test.mjs

import assert from '../lib/assert.mjs'
import t from '../lib/eltro.mjs'
import { spy, stub } from '../index.mjs'

[spy, stub].forEach(function(tester, i) {
  t.describe(`#${i === 0 ? 'spy' : 'stub'}()`, function() {
    t.test('should keep track of call count', function() {
      let spyer = tester()
      assert.strictEqual(spyer.callCount, 0)
      assert.notOk(spyer.called)
      assert.strictEqual(spyer.firstCall, null)
      assert.strictEqual(spyer.secondCall, null)
      assert.strictEqual(spyer.thirdCall, null)
  
      spyer()
      assert.strictEqual(spyer.callCount, 1)
      assert.ok(spyer.called)
      assert.deepStrictEqual(spyer.firstCall, [])
      assert.strictEqual(spyer.secondCall, null)
      assert.strictEqual(spyer.thirdCall, null)
  
      spyer()
      assert.strictEqual(spyer.callCount, 2)
      assert.ok(spyer.called)
      assert.deepStrictEqual(spyer.firstCall, [])
      assert.deepStrictEqual(spyer.secondCall, [])
      assert.strictEqual(spyer.thirdCall, null)
  
      spyer()
      assert.strictEqual(spyer.callCount, 3)
      assert.ok(spyer.called)
      assert.deepStrictEqual(spyer.firstCall, [])
      assert.deepStrictEqual(spyer.secondCall, [])
      assert.deepStrictEqual(spyer.thirdCall, [])
      
      spyer()
      assert.strictEqual(spyer.callCount, 4)
    })
  
    t.test('should keep track of arguments used to call', function() {
      const assertFirstArgs = 'asdf'
      const assertSecondArgs = { a: 1 }
      const assertThirdArgs = [{ b: 1 }, { c: 2 }]
      let spyer = tester()
      assert.notOk(spyer.called)
      
      spyer(assertFirstArgs)
      spyer(assertSecondArgs)
      spyer(assertThirdArgs[0], assertThirdArgs[1])
      assert.strictEqual(spyer.callCount, 3)
  
      assert.strictEqual(spyer.onCall(0)[0], assertFirstArgs)
      assert.strictEqual(spyer.onCall(1)[0], assertSecondArgs)
      assert.strictEqual(spyer.onCall(2)[0], assertThirdArgs[0])
      assert.strictEqual(spyer.onCall(2)[1], assertThirdArgs[1])
  
      assert.strictEqual(spyer.firstCall[0], assertFirstArgs)
      assert.strictEqual(spyer.secondCall[0], assertSecondArgs)
      assert.strictEqual(spyer.thirdCall[0], assertThirdArgs[0])
      assert.strictEqual(spyer.thirdCall[1], assertThirdArgs[1])
    })
  })
})

t.describe('#stub()', function() {
  t.test('should support returns', function() {
    const assertInput = { a : 1 }
    const assertReturns = { b: 3 }
    let s = stub()
    assert.strictEqual(s(), undefined)
    s.returns(assertReturns)
    assert.strictEqual(s(assertInput), assertReturns)
    assert.ok(s.called)
    assert.strictEqual(s.callCount, 2)
    assert.strictEqual(s.secondCall[0], assertInput)
  })
  
  t.test('should support throws', function() {
    const assertInput = { a : 1 }
    const assertThrows = new Error('testety test')
    let s = stub()
    assert.strictEqual(s(), undefined)
    s.throws(assertThrows)
    assert.throws(function() {
      s(assertInput)
    }, assertThrows)
    assert.ok(s.called)
    assert.strictEqual(s.callCount, 2)
    assert.strictEqual(s.secondCall[0], assertInput)
  })

  t.test('should support resolves', async function() {
    const assertInput = { a : 1 }
    const assertReturns = { b: 3 }
    let s = stub()
    assert.strictEqual(s(), undefined)
    s.resolves(assertReturns)
    let promiser = s(assertInput)
    assert.ok(promiser.then)
    assert.strictEqual(typeof(promiser.then), 'function')
    let output = await promiser
    assert.strictEqual(output, assertReturns)
  })
  
  t.test('should support rejects', async function() {
    const assertInput = { a : 1 }
    const assertReturns = { b: 3 }
    let s = stub()
    assert.strictEqual(s(), undefined)
    s.rejects(assertReturns)
    let promiser = s(assertInput)
    assert.ok(promiser.then)
    assert.strictEqual(typeof(promiser.then), 'function')
    let output = await assert.isRejected(promiser)
    assert.strictEqual(output, assertReturns)
  })
  
  t.test('should support custom function overwrite', async function() {
    const assertInput = { a : 1 }
    const assertReturns = { b: 3 }
    let ourCallCount = 50
    let s = stub(function(input) {
      ourCallCount++
      assert.strictEqual(input, assertInput)
      return assertReturns
    })
    assert.strictEqual(s(assertInput), assertReturns)
    assert.ok(s.called)
    assert.strictEqual(s.callCount, 1)
    assert.strictEqual(ourCallCount, 51)
    assert.strictEqual(s.firstCall[0], assertInput)
    
    assert.throws(function() {
      s(null)
    })
  })
  
  t.test('should support custom function overwrite after the fact', async function() {
    const assertInput = { a : 1 }
    const assertReturns = { b: 3 }
    let ourCallCount = 0
    let s = stub()
    assert.strictEqual(s(null), undefined)
    s.returnWith(function(input) {
      ourCallCount++
      assert.strictEqual(input, assertInput)
      return assertReturns
    })
    assert.strictEqual(s(assertInput), assertReturns)
    assert.ok(s.called)
    assert.strictEqual(s.callCount, 2)
    assert.strictEqual(ourCallCount, 1)
    assert.strictEqual(s.secondCall[0], assertInput)
    
    assert.throws(function() {
      s(null)
    })
  })

  t.test('should throw if parameter is something else than a function', function() {
    assert.ok(stub(null))
    assert.ok(stub(0))
    assert.ok(stub(''))
    assert.strictEqual(stub(null)(), undefined)
    assert.strictEqual(stub(0)(), undefined)
    assert.strictEqual(stub('')(), undefined)
    assert.throws(function() { stub([]) })
    assert.throws(function() { stub({}) })
    assert.throws(function() { stub(123) })
    assert.throws(function() { stub('asdf') })
  })

  t.test('should throw if returnWith is called with something else than a function', function() {
    assert.throws(function() { stub().returnWith(0) })
    assert.throws(function() { stub().returnWith('') })
    assert.throws(function() { stub().returnWith(null) })
    assert.throws(function() { stub().returnWith([]) })
    assert.throws(function() { stub().returnWith({}) })
    assert.throws(function() { stub().returnWith(123) })
    assert.throws(function() { stub().returnWith('asdf') })
  })
})