         let key = "key"
         let dictionary: NSDictionary = [key: NSNull()]
         // when
-        let string = try! dictionary => key as [String]?
+        let string = dictionary => key as [String]?
         // then
         XCTAssertNil(string)
     }

        let key = "key"
        let dictionary = NSDictionary()
        // when
        let string = try! dictionary => key as [String]?
        // then
        XCTAssertNil(string)
    }

        let value = ["value"]
        let dictionary: NSDictionary = [key: value]
        // when
        let string = dictionary => key as [String]?
        // then
        XCTAssertEqual(string!, value)
    }
