Better tests for btoa

test/specs/helpers/btoa.spec.js

@@ -0,0 +1,27 @@
+var __btoa = require('../../../lib/helpers/btoa');
+
+describe('btoa polyfill', function () {
+  it('should behave the same as native window.btoa', function () {
+    var data = 'Hello, world';
+    expect(__btoa(data)).toEqual(window.btoa(data));
+  });
+
+  it('should throw an error if char is out of range 0xFF', function () {
+    var err1, err2;
+    var data = 'I ♡ Unicode!';
+    
+    try {
+      window.btoa(data);
+    } catch (e) {
+      err1 = e;
+    }
+
+    try {
+      __btoa(data);
+    } catch (e) {
+      err2 = e;
+    }
+
+    expect(err1.message).toEqual(err2.message);
+  });
+});