diff --git a/src/core/src/encodings.rs b/src/core/src/encodings.rs
index 56077c80e1..06af5d03c1 100644
--- a/src/core/src/encodings.rs
+++ b/src/core/src/encodings.rs
@@ -520,6 +520,7 @@ impl<'a> Iterator for Indices<'a> {
 #[cfg(test)]
 mod test {
     use super::*;
+    use std::convert::TryFrom;
 
     #[test]
     fn colors_update() {
@@ -587,4 +588,94 @@ mod test {
 
         assert_eq!(colors.len(), 2);
     }
+
+    #[test]
+    fn test_dna_method() {
+        assert!(HashFunctions::Murmur64Dna.dna());
+        assert!(!HashFunctions::Murmur64Protein.dna());
+        assert!(!HashFunctions::Murmur64Dayhoff.dna());
+    }
+
+    #[test]
+    fn test_protein_method() {
+        assert!(HashFunctions::Murmur64Protein.protein());
+        assert!(!HashFunctions::Murmur64Dna.protein());
+        assert!(!HashFunctions::Murmur64Dayhoff.protein());
+    }
+
+    #[test]
+    fn test_dayhoff_method() {
+        assert!(HashFunctions::Murmur64Dayhoff.dayhoff());
+        assert!(!HashFunctions::Murmur64Dna.dayhoff());
+        assert!(!HashFunctions::Murmur64Protein.dayhoff());
+    }
+
+    #[test]
+    fn test_hp_method() {
+        assert!(HashFunctions::Murmur64Hp.hp());
+        assert!(!HashFunctions::Murmur64Dna.hp());
+        assert!(!HashFunctions::Murmur64Protein.hp());
+    }
+
+    #[test]
+    fn test_skipm1n3_method() {
+        assert!(HashFunctions::Murmur64Skipm1n3.skipm1n3());
+        assert!(!HashFunctions::Murmur64Dna.skipm1n3());
+        assert!(!HashFunctions::Murmur64Protein.skipm1n3());
+    }
+
+    #[test]
+    fn test_skipm2n3_method() {
+        assert!(HashFunctions::Murmur64Skipm2n3.skipm2n3());
+        assert!(!HashFunctions::Murmur64Dna.skipm2n3());
+        assert!(!HashFunctions::Murmur64Protein.skipm2n3());
+    }
+
+    #[test]
+    fn test_display_hashfunctions() {
+        assert_eq!(HashFunctions::Murmur64Dna.to_string(), "DNA");
+        assert_eq!(HashFunctions::Murmur64Protein.to_string(), "protein");
+        assert_eq!(HashFunctions::Murmur64Dayhoff.to_string(), "dayhoff");
+        assert_eq!(HashFunctions::Murmur64Hp.to_string(), "hp");
+        assert_eq!(HashFunctions::Murmur64Skipm1n3.to_string(), "skipm1n3");
+        assert_eq!(HashFunctions::Murmur64Skipm2n3.to_string(), "skipm2n3");
+        assert_eq!(
+            HashFunctions::Custom("custom_string".into()).to_string(),
+            "custom_string"
+        );
+    }
+
+    #[test]
+    fn test_try_from_str_valid() {
+        assert_eq!(
+            HashFunctions::try_from("dna").unwrap(),
+            HashFunctions::Murmur64Dna
+        );
+        assert_eq!(
+            HashFunctions::try_from("protein").unwrap(),
+            HashFunctions::Murmur64Protein
+        );
+        assert_eq!(
+            HashFunctions::try_from("dayhoff").unwrap(),
+            HashFunctions::Murmur64Dayhoff
+        );
+        assert_eq!(
+            HashFunctions::try_from("hp").unwrap(),
+            HashFunctions::Murmur64Hp
+        );
+        assert_eq!(
+            HashFunctions::try_from("skipm1n3").unwrap(),
+            HashFunctions::Murmur64Skipm1n3
+        );
+        assert_eq!(
+            HashFunctions::try_from("skipm2n3").unwrap(),
+            HashFunctions::Murmur64Skipm2n3
+        );
+    }
+
+    #[test]
+    #[should_panic(expected = "not implemented: unknown")]
+    fn test_try_from_str_invalid() {
+        HashFunctions::try_from("unknown").unwrap();
+    }
 }
diff --git a/src/core/src/signature.rs b/src/core/src/signature.rs
index 5cc60ca299..7fdb9b7f2d 100644
--- a/src/core/src/signature.rs
+++ b/src/core/src/signature.rs
@@ -995,6 +995,7 @@ impl TryInto<KmerMinHash> for Signature {
 #[cfg(test)]
 mod test {
 
+    use core::num;
     use std::fs::File;
     use std::io::{BufReader, Read};
     use std::path::PathBuf;
@@ -1003,8 +1004,7 @@ mod test {
 
     use crate::cmd::ComputeParameters;
     use crate::encodings::HashFunctions;
-    use crate::signature::SeqToHashes;
-    use crate::signature::SigsTrait;
+    use crate::signature::{ReadingFrame, SeqToHashes, SigsTrait};
 
     use super::Signature;
 
@@ -1432,6 +1432,15 @@ mod test {
         }
     }
 
+    #[test]
+    fn test_readingframe_dna() {
+        let sequence = b"AGTCGT";
+        let frame = ReadingFrame::new_dna(sequence);
+
+        assert_eq!(frame.fw(), sequence.as_slice());
+        assert_eq!(frame.rc(), b"ACGACT".as_slice());
+    }
+
     #[test]
     fn test_seqtohashes_frames_dna() {
         let sequence = b"AGTCGT";
@@ -1465,6 +1474,16 @@ mod test {
         assert_eq!(frames[0].fw(), sequence.as_slice());
     }
 
+    #[test]
+    fn test_readingframe_protein() {
+        let sequence = b"MVLSPADKTNVKAAW";
+        let hash_function = HashFunctions::Murmur64Protein;
+        let frame =
+            ReadingFrame::new_protein(sequence, hash_function.dayhoff(), hash_function.hp());
+
+        assert_eq!(frame.fw(), sequence.as_slice());
+    }
+
     #[test]
     #[should_panic]
     fn test_seqtohashes_frames_is_protein_try_access_rc() {
@@ -1537,6 +1556,17 @@ mod test {
         assert_eq!(frames[5].fw(), b"LDD".as_slice());
     }
 
+    #[test]
+    #[should_panic(expected = "Skipmer frame number must be < n")]
+    fn test_readingframe_skipmer() {
+        let sequence = b"AGTCGT";
+        let m = 2;
+        let n = 3;
+        let num_frames = 4; // four frames but n is only 3
+
+        ReadingFrame::new_skipmer(sequence, num_frames, m, n);
+    }
+
     #[test]
     fn test_seqtohashes_frames_skipmer_m1n3() {
         let sequence = b"AGTCGTCGAGCT";