diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..8697fef
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+*.dat binary
diff --git a/protocol/src/lib.rs b/protocol/src/lib.rs
index a8bb427..4347cd1 100644
--- a/protocol/src/lib.rs
+++ b/protocol/src/lib.rs
@@ -28,6 +28,7 @@ pub const PROTOCOL_VERSION: usize = 498;
 const STRING_MAX_LENGTH: u32 = 32_768;
 
 /// Possible errors while encoding packet.
+#[derive(Debug)]
 pub enum EncodeError {
     /// String length can't be more than provided value.
     StringTooLong {
@@ -57,6 +58,7 @@ impl From<JsonError> for EncodeError {
 }
 
 /// Possible errors while decoding packet.
+#[derive(Debug)]
 pub enum DecodeError {
     /// Packet was not recognized. Invalid data or wrong protocol version.
     UnknownPacketType {
@@ -171,7 +173,7 @@ impl<R: Read> PacketRead for R {
     }
 
     fn read_string(&mut self, max_length: u32) -> Result<String, DecodeError> {
-        let length = self.read_var_u32()?;
+        let length = self.read_var_i32()? as u32;
 
         if length > max_length as u32 {
             return Err(DecodeError::StringTooLong { length, max_length });
@@ -229,7 +231,7 @@ impl<W: Write> PacketWrite for W {
             return Err(EncodeError::StringTooLong { length, max_length });
         }
 
-        self.write_var_u32(value.len() as u32)?;
+        self.write_var_i32(value.len() as i32)?;
         self.write_all(value.as_bytes())?;
 
         Ok(())
diff --git a/protocol/src/login.rs b/protocol/src/login.rs
index 46d9872..8891408 100644
--- a/protocol/src/login.rs
+++ b/protocol/src/login.rs
@@ -106,7 +106,6 @@ impl LoginClientBoundPacket {
     }
 }
 
-#[derive(minecraft_protocol_derive::MinecraftPacket)]
 pub struct LoginStart {
     pub name: String,
 }
@@ -119,6 +118,20 @@ impl LoginStart {
     }
 }
 
+impl Packet for LoginStart {
+    type Output = Self;
+
+    fn encode<W: Write>(&self, writer: &mut W) -> Result<(), EncodeError> {
+        writer.write_string(&self.name, LOGIN_MAX_LENGTH)
+    }
+
+    fn decode<R: Read>(reader: &mut R) -> Result<Self::Output, DecodeError> {
+        let name = reader.read_string(LOGIN_MAX_LENGTH)?;
+
+        Ok(LoginStart { name })
+    }
+}
+
 pub struct EncryptionResponse {
     pub shared_secret: Vec<u8>,
     pub verify_token: Vec<u8>,
@@ -379,3 +392,66 @@ impl Packet for LoginPluginRequest {
         })
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::login::LoginPluginResponse;
+    use crate::login::LoginStart;
+    use crate::Packet;
+    use std::io::Cursor;
+
+    #[test]
+    fn test_login_start_packet_encode() {
+        let login_start = LoginStart {
+            name: String::from("Username"),
+        };
+
+        let mut vec = Vec::new();
+        login_start.encode(&mut vec).unwrap();
+
+        assert_eq!(
+            vec,
+            include_bytes!("../test/packet/login/login_start.dat").to_vec()
+        );
+    }
+
+    #[test]
+    fn test_login_start_packet_decode() {
+        let mut cursor =
+            Cursor::new(include_bytes!("../test/packet/login/login_start.dat").to_vec());
+        let login_start = LoginStart::decode(&mut cursor).unwrap();
+
+        assert_eq!(login_start.name, String::from("Username"));
+    }
+
+    #[test]
+    fn test_login_plugin_response_encode() {
+        let login_plugin_response = LoginPluginResponse {
+            message_id: 55,
+            successful: true,
+            data: vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
+        };
+
+        let mut vec = Vec::new();
+        login_plugin_response.encode(&mut vec).unwrap();
+
+        assert_eq!(
+            vec,
+            include_bytes!("../test/packet/login/login_plugin_response.dat").to_vec()
+        );
+    }
+
+    #[test]
+    fn test_login_plugin_response_decode() {
+        let mut cursor =
+            Cursor::new(include_bytes!("../test/packet/login/login_plugin_response.dat").to_vec());
+        let login_plugin_response = LoginPluginResponse::decode(&mut cursor).unwrap();
+
+        assert_eq!(login_plugin_response.message_id, 55);
+        assert!(login_plugin_response.successful);
+        assert_eq!(
+            login_plugin_response.data,
+            vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+        );
+    }
+}
diff --git a/protocol/test/packet/login/login_plugin_response.dat b/protocol/test/packet/login/login_plugin_response.dat
new file mode 100644
index 0000000..10c09e4
--- /dev/null
+++ b/protocol/test/packet/login/login_plugin_response.dat
@@ -0,0 +1 @@
+7

	
diff --git a/protocol/test/packet/login/login_start.dat b/protocol/test/packet/login/login_start.dat
new file mode 100644
index 0000000..81e0277
--- /dev/null
+++ b/protocol/test/packet/login/login_start.dat
@@ -0,0 +1 @@
+Username
\ No newline at end of file