Add failing tests

tests/ruby/helpers/frontend_messages.rb

@@ -0,0 +1,145 @@
+
+class PostgresMessage
+  # Base class for common functionality
+
+  def encode_string(str)
+    "#{str}\0"  # Encode a string with a null terminator
+  end
+
+  def encode_int16(value)
+    [value].pack('n')  # Encode an Int16
+  end
+
+  def encode_int32(value)
+    [value].pack('N')  # Encode an Int32
+  end
+
+  def message_prefix(type, length)
+    "#{type}#{encode_int32(length)}"  # Message type and length prefix
+  end
+end
+
+class SimpleQueryMessage < PostgresMessage
+  attr_accessor :query
+
+  def initialize(query = "")
+    @query = query
+  end
+
+  def to_bytes
+    query_bytes = encode_string(@query)
+    length = 4 + query_bytes.size  # Length includes 4 bytes for length itself
+    message_prefix('Q', length) + query_bytes
+  end
+end
+
+class ParseMessage < PostgresMessage
+  attr_accessor :statement_name, :query, :parameter_types
+
+  def initialize(statement_name = "", query = "", parameter_types = [])
+    @statement_name = statement_name
+    @query = query
+    @parameter_types = parameter_types
+  end
+
+  def to_bytes
+    statement_name_bytes = encode_string(@statement_name)
+    query_bytes = encode_string(@query)
+    parameter_types_bytes = @parameter_types.pack('N*')
+    
+    length = 4 + statement_name_bytes.size + query_bytes.size + 2 + parameter_types_bytes.size
+    message_prefix('P', length) + statement_name_bytes + query_bytes + encode_int16(@parameter_types.size) + parameter_types_bytes
+  end
+end
+
+class BindMessage < PostgresMessage
+  attr_accessor :portal_name, :statement_name, :parameter_format_codes, :parameters, :result_column_format_codes
+
+  def initialize(portal_name = "", statement_name = "", parameter_format_codes = [], parameters = [], result_column_format_codes = [])
+    @portal_name = portal_name
+    @statement_name = statement_name
+    @parameter_format_codes = parameter_format_codes
+    @parameters = parameters
+    @result_column_format_codes = result_column_format_codes
+  end
+
+  def to_bytes
+    portal_name_bytes = encode_string(@portal_name)
+    statement_name_bytes = encode_string(@statement_name)
+    parameter_format_codes_bytes = @parameter_format_codes.pack('n*')
+    
+    parameters_bytes = @parameters.map do |param|
+      if param.nil?
+        encode_int32(-1)
+      else
+        encode_int32(param.bytesize) + param
+      end
+    end.join
+
+    result_column_format_codes_bytes = @result_column_format_codes.pack('n*')
+
+    length = 4 + portal_name_bytes.size + statement_name_bytes.size + 2 + parameter_format_codes_bytes.size + 2 + parameters_bytes.size + 2 + result_column_format_codes_bytes.size
+    message_prefix('B', length) + portal_name_bytes + statement_name_bytes + encode_int16(@parameter_format_codes.size) + parameter_format_codes_bytes + encode_int16(@parameters.size) + parameters_bytes + encode_int16(@result_column_format_codes.size) + result_column_format_codes_bytes
+  end
+end
+
+class DescribeMessage < PostgresMessage
+  attr_accessor :type, :name
+
+  def initialize(type = 'S', name = "")
+    @type = type
+    @name = name
+  end
+
+  def to_bytes
+    name_bytes = encode_string(@name)
+    length = 4 + 1 + name_bytes.size
+    message_prefix('D', length) + @type + name_bytes
+  end
+end
+
+
+class ExecuteMessage < PostgresMessage
+  attr_accessor :portal_name, :max_rows
+
+  def initialize(portal_name = "", max_rows = 0)
+    @portal_name = portal_name
+    @max_rows = max_rows
+  end
+
+  def to_bytes
+    portal_name_bytes = encode_string(@portal_name)
+    length = 4 + portal_name_bytes.size + 4
+    message_prefix('E', length) + portal_name_bytes + encode_int32(@max_rows)
+  end
+end
+
+class FlushMessage < PostgresMessage
+  def to_bytes
+    length = 4
+    message_prefix('H', length)
+  end
+end
+
+class SyncMessage < PostgresMessage
+  def to_bytes
+    length = 4
+    message_prefix('S', length)
+  end
+end
+
+class CloseMessage < PostgresMessage
+  attr_accessor :type, :name
+
+  def initialize(type = 'S', name = "")
+    @type = type
+    @name = name
+  end
+
+  def to_bytes
+    name_bytes = encode_string(@name)
+    length = 4 + 1 + name_bytes.size
+    message_prefix('C', length) + @type + name_bytes
+  end
+end
+