         
         let synthPlayExpectation = expectationWithDescription("Synthesize Audio")
         
-        service!.synthesize(testString, oncompletion: {
+        service!.synthesize(testString) {
             data, error in
             
             if let data = data {

        let playExpectation = expectationWithDescription("Synthesize German Audio")
        let dieterVoice = "de-DE_DieterVoice"
        
        service!.synthesize(germanString, voice: dieterVoice,
            oncompletion: {
            data, error in
            
            if let data = data {

                
            }
            
        }
        
        waitForExpectationsWithTimeout(timeout, handler: { error in XCTAssertNil(error, "Timeout") })
    }
