Tests.

test/protocol/http2/framer.rb

@@ -9,6 +9,13 @@
 	let(:stream) {StringIO.new}
 	let(:framer) {subject.new(stream)}
 
+	with "#flush" do
+		it "flushes the underlying stream" do
+			expect(stream).to receive(:flush)
+			framer.flush
+		end
+	end
+
 	with "#closed?" do
 		it "reports the status of the underlying stream" do
 			expect(stream).to receive(:closed?).and_return(true)

test/protocol/http2/server.rb

@@ -42,6 +42,18 @@
 		expect(server.state).to be == :new
 	end
 
+	it "fails with protocol error if first frame is not settings frame" do
+		framer.write_connection_preface
+
+		data_frame = Protocol::HTTP2::DataFrame.new
+		data_frame.pack("Hello, World!")
+		framer.write_frame(data_frame)
+
+		expect do
+			server.read_connection_preface
+		end.to raise_exception(Protocol::HTTP2::ProtocolError, message: be =~ /First frame must be #{Protocol::HTTP2::SettingsFrame}/)
+	end
+
 	it "cannot read connection preface in open state" do
 		server.open!
 		expect do