Method TestLargeRecord

credentials/alts/internal/conn/record_test.go:196–211

TestLargeRecord writes a very large ALTS record and verifies that the server receives it correctly. The large ALTS record should cause the reader to expand it's read buffer to hold the entire record and store the decrypted message until the receiver reads all of the bytes.

(t *testing.T)

// expand it's read buffer to hold the entire record and store the decrypted
// message until the receiver reads all of the bytes.
func (s) TestLargeRecord(t *testing.T) {
	clientConn, serverConn := newConnPair(rekeyRecordProtocol, nil, nil)
	msg := []byte(strings.Repeat("a", 2*altsReadBufferInitialSize))
	// Increase the size of ALTS records written by the client.
	clientConn.payloadLengthLimit = math.MaxInt32
	if n, err := clientConn.Write(msg); n != len(msg) || err != nil {
		t.Fatalf("Write() = %v, %v; want %v, <nil>", n, err, len(msg))
	}
	rcvMsg := make([]byte, len(msg))
	if n, err := io.ReadFull(serverConn, rcvMsg); n != len(rcvMsg) || err != nil {
		t.Fatalf("Read() = %v, %v; want %v, <nil>", n, err, len(rcvMsg))
	}
	if !reflect.DeepEqual(msg, rcvMsg) {
		t.Fatalf("Write()/Server Read() = %v, want %v", rcvMsg, msg)
	}
}

// BenchmarkLargeMessage measures the performance of ALTS conns for sending and
// receiving a large message.