diff --git a/milli/src/search/mod.rs b/milli/src/search/mod.rs
index 95e26b594..0d33d9042 100644
--- a/milli/src/search/mod.rs
+++ b/milli/src/search/mod.rs
@@ -398,4 +398,67 @@ mod test {
         search.authorize_typos(true);
         assert!(!search.is_typo_authorized().unwrap());
     }
+
+    #[test]
+    fn test_one_typos_tolerance() {
+        let fst = fst::Set::from_iter(["zealand"].iter()).unwrap().map_data(Cow::Owned).unwrap();
+        let mut cache = HashMap::new();
+        let found = word_derivations("zealend", false, 1, &fst, &mut cache).unwrap();
+
+        assert_eq!(found, &[("zealand".to_string(), 1)]);
+    }
+
+    #[test]
+    fn test_one_typos_first_letter() {
+        let fst = fst::Set::from_iter(["zealand"].iter()).unwrap().map_data(Cow::Owned).unwrap();
+        let mut cache = HashMap::new();
+        let found = word_derivations("sealand", false, 1, &fst, &mut cache).unwrap();
+
+        assert_eq!(found, &[]);
+    }
+
+    #[test]
+    fn test_two_typos_tolerance() {
+        let fst = fst::Set::from_iter(["zealand"].iter()).unwrap().map_data(Cow::Owned).unwrap();
+        let mut cache = HashMap::new();
+        let found = word_derivations("zealemd", false, 2, &fst, &mut cache).unwrap();
+
+        assert_eq!(found, &[("zealand".to_string(), 2)]);
+    }
+
+    #[test]
+    fn test_two_typos_first_letter() {
+        let fst = fst::Set::from_iter(["zealand"].iter()).unwrap().map_data(Cow::Owned).unwrap();
+        let mut cache = HashMap::new();
+        let found = word_derivations("sealand", false, 2, &fst, &mut cache).unwrap();
+
+        assert_eq!(found, &[("zealand".to_string(), 2)]);
+    }
+
+    #[test]
+    fn test_prefix() {
+        let fst = fst::Set::from_iter(["zealand"].iter()).unwrap().map_data(Cow::Owned).unwrap();
+        let mut cache = HashMap::new();
+        let found = word_derivations("ze", true, 0, &fst, &mut cache).unwrap();
+
+        assert_eq!(found, &[("zealand".to_string(), 0)]);
+    }
+
+    #[test]
+    fn test_bad_prefix() {
+        let fst = fst::Set::from_iter(["zealand"].iter()).unwrap().map_data(Cow::Owned).unwrap();
+        let mut cache = HashMap::new();
+        let found = word_derivations("se", true, 0, &fst, &mut cache).unwrap();
+
+        assert_eq!(found, &[]);
+    }
+
+    #[test]
+    fn test_prefix_with_typo() {
+        let fst = fst::Set::from_iter(["zealand"].iter()).unwrap().map_data(Cow::Owned).unwrap();
+        let mut cache = HashMap::new();
+        let found = word_derivations("zae", true, 1, &fst, &mut cache).unwrap();
+
+        assert_eq!(found, &[("zealand".to_string(), 1)]);
+    }
 }