change approach again

node_modules/array-back/test.js

@@ -0,0 +1,24 @@
+'use strict'
+const TestRunner = require('test-runner')
+const arrayify = require('./')
+const a = require('assert')
+
+const runner = new TestRunner()
+
+runner.test('if already array, do nothing', function () {
+  const arr = [ 1,2,3 ]
+  const result = arrayify(arr)
+  a.strictEqual(arr, result)
+})
+
+runner.test('arrayify()', function () {
+  a.deepStrictEqual(arrayify(undefined), [])
+  a.deepStrictEqual(arrayify(null), [ null ])
+  a.deepStrictEqual(arrayify(0), [ 0 ])
+  a.deepStrictEqual(arrayify([ 1, 2 ]), [ 1, 2 ])
+
+  function func () {
+    a.deepStrictEqual(arrayify(arguments), [ 1, 2, 3 ])
+  }
+  func(1, 2, 3)
+})