diff --git a/src/proto.rs b/src/proto.rs
index ca6510a..f0c8f9b 100644
--- a/src/proto.rs
+++ b/src/proto.rs
@@ -376,5 +376,141 @@ mod tests {
                 Ok(())
             }
         }
+
+        mod query_count {
+            use super::super::super::*;
+
+            #[test]
+            fn zero() -> Result<(), DNSParseError> {
+                let dns_query = [
+                    0xff, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                ];
+                let parse_result = DNSHeader::from_udp_datagram(&dns_query);
+                assert_eq!(parse_result?.query_count, 0);
+                Ok(())
+            }
+
+            #[test]
+            fn one() -> Result<(), DNSParseError> {
+                let dns_query = [
+                    0xff, 0x00, 0x80, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                ];
+                let parse_result = DNSHeader::from_udp_datagram(&dns_query);
+                assert_eq!(parse_result?.query_count, 1);
+                Ok(())
+            }
+
+            #[test]
+            fn max_value() -> Result<(), DNSParseError> {
+                let dns_query = [
+                    0xff, 0x00, 0x80, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                ];
+                let parse_result = DNSHeader::from_udp_datagram(&dns_query);
+                assert_eq!(parse_result?.query_count, 65535);
+                Ok(())
+            }
+        }
+
+        mod answer_count {
+            use super::super::super::*;
+
+            #[test]
+            fn zero() -> Result<(), DNSParseError> {
+                let dns_query = [
+                    0xff, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                ];
+                let parse_result = DNSHeader::from_udp_datagram(&dns_query);
+                assert_eq!(parse_result?.answer_count, 0);
+                Ok(())
+            }
+
+            #[test]
+            fn one() -> Result<(), DNSParseError> {
+                let dns_query = [
+                    0xff, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
+                ];
+                let parse_result = DNSHeader::from_udp_datagram(&dns_query);
+                assert_eq!(parse_result?.answer_count, 1);
+                Ok(())
+            }
+
+            #[test]
+            fn max_value() -> Result<(), DNSParseError> {
+                let dns_query = [
+                    0xff, 0x00, 0x80, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00,
+                ];
+                let parse_result = DNSHeader::from_udp_datagram(&dns_query);
+                assert_eq!(parse_result?.answer_count, 65535);
+                Ok(())
+            }
+        }
+
+        mod name_server_count {
+            use super::super::super::*;
+
+            #[test]
+            fn zero() -> Result<(), DNSParseError> {
+                let dns_query = [
+                    0xff, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                ];
+                let parse_result = DNSHeader::from_udp_datagram(&dns_query);
+                assert_eq!(parse_result?.name_server_count, 0);
+                Ok(())
+            }
+
+            #[test]
+            fn one() -> Result<(), DNSParseError> {
+                let dns_query = [
+                    0xff, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00,
+                ];
+                let parse_result = DNSHeader::from_udp_datagram(&dns_query);
+                assert_eq!(parse_result?.name_server_count, 1);
+                Ok(())
+            }
+
+            #[test]
+            fn max_value() -> Result<(), DNSParseError> {
+                let dns_query = [
+                    0xff, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+                ];
+                let parse_result = DNSHeader::from_udp_datagram(&dns_query);
+                assert_eq!(parse_result?.name_server_count, 65535);
+                Ok(())
+            }
+        }
+
+        mod additional_count {
+            use super::super::super::*;
+
+            #[test]
+            fn zero() -> Result<(), DNSParseError> {
+                let dns_query = [
+                    0xff, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                ];
+                let parse_result = DNSHeader::from_udp_datagram(&dns_query);
+                assert_eq!(parse_result?.additional_count, 0);
+                Ok(())
+            }
+
+            #[test]
+            fn one() -> Result<(), DNSParseError> {
+                let dns_query = [
+                    0xff, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
+                ];
+                let parse_result = DNSHeader::from_udp_datagram(&dns_query);
+                assert_eq!(parse_result?.additional_count, 1);
+                Ok(())
+            }
+
+            #[test]
+            fn max_value() -> Result<(), DNSParseError> {
+                let dns_query = [
+                    0xff, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
+                ];
+                let parse_result = DNSHeader::from_udp_datagram(&dns_query);
+                assert_eq!(parse_result?.additional_count, 65535);
+                Ok(())
+            }
+        }
     }
 }