Test that the host idna encoding in the handshake works

This ensures that the byte representation is idna encoded and that the
host is correctly decoded in the request instance.

Author: pgjones

test/test_handshake.py

@@ -23,6 +23,17 @@ def test_successful_handshake() -> None:
     assert repr(server) == "H11Handshake(client=False, state=ConnectionState.OPEN)"
 
 
+def test_host_encoding() -> None:
+    client = H11Handshake(CLIENT)
+    server = H11Handshake(SERVER)
+    data = client.send(Request(host="芝士汉堡", target="/"))
+    assert b"Host: xn--7ks3rz39bh7u" in data
+    server.receive_data(data)
+    request = next(server.events())
+    assert isinstance(request, Request)
+    assert request.host == "芝士汉堡"
+
+
 @pytest.mark.parametrize("http", [b"HTTP/1.0", b"HTTP/1.1"])
 def test_rejected_handshake(http: bytes) -> None:
     server = H11Handshake(SERVER)