     // MARK: - Parameters and Constants
     
     // the PersonalityInsights service
-    var service: PersonalityInsights?
+    var service: PersonalityInsights!
     
     // sample text
-    var mobyDickIntro: String?
-    var kennedySpeech: String?
+    var mobyDickIntro: String!
+    var kennedySpeech: String!
     
     // timeout for asynchronous completion handlers
     let timeout: NSTimeInterval = 30.0

        let description = "Try to analyze text that is too short (less than 100 words)."
        let expectation = expectationWithDescription(description)
        
        service!.getProfile(mobyDickIntro!) { profile, error in
            // verify expected response
            XCTAssertNil(profile)
            XCTAssertNotNil(error)

        let expectation = expectationWithDescription(description)
        
        // analyze speech
        service.getProfile(kennedySpeech) { profile, error in
            
            // verify expected response
            XCTAssertNotNil(profile)
