spy/stub: Add support for lastCall

Also added missing license file

LICENSE

@@ -0,0 +1,13 @@
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+                    Version 2, December 2004
+
+ Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
+
+ Everyone is permitted to copy and distribute verbatim or modified
+ copies of this license document, and changing it is allowed as long
+ as the name is changed.
+
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. You just DO WHAT THE FUCK YOU WANT TO.

lib/sinon.mjs

@@ -17,6 +17,7 @@ export function stub(returnFunc = null) {
   let func = function(...args) {
     func.called = true
     calls.push(args)
+    func.lastCall = args
     if (func.callCount < indexMap.length) {
       func[indexMap[func.callCount]] = args
     }
@@ -25,12 +26,14 @@ export function stub(returnFunc = null) {
       return returner(...args)
     }
   }
+  func.lastCall = null
   func.called = false
   func.callCount = 0
   func.onCall = function(i) {
     return calls[i]
   }
   func.reset = function() {
+    func.lastCall = null
     func.called = false
     func.callCount = 0
     for (let i = 0; i < indexMap.length; i++) {

package.json

@@ -30,6 +30,7 @@
     "index.mjs",
     "cli.mjs",
     "README.md",
+    "LICENSE",
     "lib"
   ]
 }

test/sinon.test.mjs

@@ -11,6 +11,7 @@ import { spy, stub } from '../index.mjs'
       assert.strictEqual(spyer.firstCall, null)
       assert.strictEqual(spyer.secondCall, null)
       assert.strictEqual(spyer.thirdCall, null)
+      assert.strictEqual(spyer.lastCall, null)
       
       spyer(1)
       spyer(2)
@@ -23,6 +24,8 @@ import { spy, stub } from '../index.mjs'
       assert.notStrictEqual(spyer.firstCall, null)
       assert.notStrictEqual(spyer.secondCall, null)
       assert.notStrictEqual(spyer.thirdCall, null)
+      assert.notStrictEqual(spyer.lastCall, null)
+      assert.strictEqual(spyer.lastCall[0], 5)
 
       spyer.reset()
       
@@ -31,6 +34,7 @@ import { spy, stub } from '../index.mjs'
       assert.strictEqual(spyer.firstCall, null)
       assert.strictEqual(spyer.secondCall, null)
       assert.strictEqual(spyer.thirdCall, null)
+      assert.strictEqual(spyer.lastCall, null)
     })
 
     t.test('should keep track of call count', function() {
@@ -74,8 +78,12 @@ import { spy, stub } from '../index.mjs'
       assert.notOk(spyer.called)
       
       spyer(assertFirstArgs)
+      assert.strictEqual(spyer.lastCall[0], assertFirstArgs)
       spyer(assertSecondArgs)
+      assert.strictEqual(spyer.lastCall[0], assertSecondArgs)
       spyer(assertThirdArgs[0], assertThirdArgs[1])
+      assert.strictEqual(spyer.lastCall[0], assertThirdArgs[0])
+      assert.strictEqual(spyer.lastCall[1], assertThirdArgs[1])
       assert.strictEqual(spyer.callCount, 3)
   
       assert.strictEqual(spyer.onCall(0)[0], assertFirstArgs)
@@ -226,6 +234,7 @@ t.describe('#stub()', function() {
     assert.strictEqual(s(3), 'test')
     assert.strictEqual(s(4), 'test')
     assert.strictEqual(s(5), 'test')
+    assert.strictEqual(s.lastCall[0], 5)
     
     assert.notStrictEqual(s.callCount, 0)
     assert.ok(s.called)