         let description = "Try to analyze text that is too short (less than 100 words)."
         let expectation = expectationWithDescription(description)
         
-        service!.getProfile(mobyDickIntro!) { profile, error in
+        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)

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