Foreach: add a missing test file.

I forgot a file in 5fcfa93, here it is.

test/asserts/foreach.js

@@ -0,0 +1,43 @@
+/* jshint qunit: true */
+/* global JSZip,JSZipTestUtils */
+'use strict';
+
+QUnit.module("forEach");
+
+test("forEach works on /", function (assert) {
+    var zip = JSZipTestUtils.createZipAll();
+    var count = 0;
+    var calls = [];
+
+    assert.equal(zip.root, "");
+
+    zip.forEach(function (path, elt) {
+        assert.equal(path, elt.name, "the full path is given on / for " + elt.name);
+        count++;
+        calls.push(path);
+    });
+
+    equal(count, 3, "the callback has been called the right number of times");
+    assert.deepEqual(calls, ["Hello.txt", "images/", "images/smile.gif"], "all paths have been called");
+});
+
+test("forEach works on a sub folder", function (assert) {
+    var zip = new JSZip();
+    var sub = zip.folder("subfolder");
+    sub.file("Hello.txt", "Hello World\n");
+    sub.folder("images").file("smile.gif", "R0lGODdhBQAFAIACAAAAAP/eACwAAAAABQAFAAACCIwPkWerClIBADs=", {base64: true});
+    var count = 0;
+    var calls = [];
+
+    assert.ok(zip.file("subfolder/Hello.txt"));
+    assert.equal(sub.root, "subfolder/");
+
+    sub.forEach(function (path, elt) {
+        assert.equal(path, elt.name.substr("subfolder/".length), "the full path is given on subfolder/ for " + path);
+        count++;
+        calls.push(path);
+    });
+
+    equal(count, 3, "the callback has been called the right number of times");
+    assert.deepEqual(calls, ["Hello.txt", "images/", "images/smile.gif"], "all paths have been called");
+});