Add first tests.

test/iterate-array.test.js

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+const { assert } = require('chai');
+const iterate = require('../index');
+
+describe('iterate arrays', function () {
+  it('should iterate all items in an array', function() {
+    const steps = [];
+    const testArr = ['a', 'b', 'c', 'd', 'e'];
+
+    iterate(testArr, (item, index, arr) => steps.push([item, index, arr]));
+
+    assert.deepEqual(steps, [
+      ['a', 0, testArr],
+      ['b', 1, testArr],
+      ['c', 2, testArr],
+      ['d', 3, testArr],
+      ['e', 4, testArr],
+    ]);
+  });
+});

test/iterate-strings.test.js

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+const { assert } = require('chai');
+const iterate = require('../index');
+
+describe('iterate string', function () {
+  it('should iterate all chars in a primative string', function() {
+    const steps = [];
+    const testStr = 'abcde';
+
+    iterate(testStr, (char, index, str) => steps.push([char, index, str]));
+
+    assert.deepEqual(steps, [
+      ['a', 0, testStr],
+      ['b', 1, testStr],
+      ['c', 2, testStr],
+      ['d', 3, testStr],
+      ['e', 4, testStr],
+    ]);
+  });
+
+  it('should iterate all chars in a string instance', function() {
+    const steps = [];
+    const testStr = new String('abcde');
+
+    iterate(testStr, (char, index, str) => steps.push([char, index, str]));
+
+    assert.deepEqual(steps, [
+      ['a', 0, testStr],
+      ['b', 1, testStr],
+      ['c', 2, testStr],
+      ['d', 3, testStr],
+      ['e', 4, testStr],
+    ]);
+  });
+});

test/iterate-typed-array.test.js

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+const { assert } = require('chai');
+const iterate = require('../index');
+
+describe('iterate typed arrays', function () {
+  it('should iterate all items in a typed array', function() {
+    const steps = [];
+    const testArr = new Int32Array([1, 2, 3, 4, 5]);
+
+    iterate(testArr, (number, index, arr) => steps.push([number, index, arr]));
+
+    assert.deepEqual(steps, [
+      [1, 0, testArr],
+      [2, 1, testArr],
+      [3, 2, testArr],
+      [4, 3, testArr],
+      [5, 4, testArr],
+    ]);
+  });
+});