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

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

        let voice = "No voice"
        let synthIncorrectExpectation = expectationWithDescription("Synthesize Incorrect Voice Audio")
        
        service!.synthesize(testString, voice: voice) {
            data, error in
            
            XCTAssertNotNil(error)
