Add helper for waiting for evaluated string

test/app.js

@@ -75,11 +75,8 @@ describe('Darkwire', () => {
           browser.click('span#send-message-btn', done);
         });
 
-        it('should send message', () => {
-          browser.tabs.current = 0;
-          browser.wait('1s', () => {
-            browser.assert.text('.messageBody', /Hello world/);
-          });
+        it('should send message', (done) => {
+          helpers.zombie.waitFor(browser, '$(".messageBody").text() === "Hello world"', done);
         });
 
       });

test/helpers.js

@@ -44,6 +44,16 @@ var helpers = {
         return [1,2,3,4];
       }
     };
+  },
+  zombie: {
+    waitFor: (browser, str, cb) => {
+      let int = setInterval(() => {
+        if (browser.evaluate(str)) {
+          clearInterval(int);
+          cb();
+        }
+      }, 50);
+    }
   }
 };