Adding #hijacked? method to connection (#30)

lib/protocol/http1/connection.rb

@@ -104,6 +104,13 @@ def write_connection_header(version)
 			def write_upgrade_header(upgrade)
 				@stream.write("connection: upgrade\r\nupgrade: #{upgrade}\r\n")
 			end
+
+			# Indicates whether the connection has been hijacked meaning its
+			# IO has been handed over and is not usable anymore.
+			# @return [Boolean] hijack status
+			def hijacked?
+				@stream.nil?
+			end
 
 			# Effectively close the connection and return the underlying IO.
 			# @return [IO] the underlying non-blocking IO.

test/protocol/http1/hijack.rb

@@ -19,11 +19,17 @@
 			server_wrapper = server.hijack!
 			expect(server.persistent).to be == false
 		end
+
+		it "should repord itself as #hijacked? after the hijack" do
+			expect(server.hijacked?).to be == false
+			server.hijack!
+			expect(server.hijacked?).to be == true
+		end
 
 		it "should use non-chunked output" do
 			expect(body).to receive(:ready?).and_return(false)
 			expect(body).to receive(:empty?).and_return(false)
-			expect(body).to receive(:length).and_return(nil)
+			expect(body).to receive(:length).twice.and_return(nil)
 			expect(body).to receive(:each).and_return(nil)
 
 			expect(server).to receive(:write_body_and_close)