diff --git a/meilidb-core/src/criterion/exact.rs b/meilidb-core/src/criterion/exact.rs
index b038b9076..bde3ca733 100644
--- a/meilidb-core/src/criterion/exact.rs
+++ b/meilidb-core/src/criterion/exact.rs
@@ -41,3 +41,25 @@ impl Criterion for Exact {
         "Exact"
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // typing: "soulier"
+    //
+    // doc0: "Soulier bleu"
+    // doc1: "souliereres rouge"
+    #[test]
+    fn easy_case() {
+        let query_index0 = &[0];
+        let is_exact0 = &[true];
+
+        let query_index1 = &[0];
+        let is_exact1 = &[false];
+
+        let doc0 = number_exact_matches(query_index0, is_exact0);
+        let doc1 = number_exact_matches(query_index1, is_exact1);
+        assert_eq!(doc0.cmp(&doc1).reverse(), Ordering::Less);
+    }
+}
diff --git a/meilidb-core/src/criterion/sum_of_words_attribute.rs b/meilidb-core/src/criterion/sum_of_words_attribute.rs
index f5a3c3576..d5787ef3a 100644
--- a/meilidb-core/src/criterion/sum_of_words_attribute.rs
+++ b/meilidb-core/src/criterion/sum_of_words_attribute.rs
@@ -40,3 +40,25 @@ impl Criterion for SumOfWordsAttribute {
         "SumOfWordsAttribute"
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // typing: "soulier"
+    //
+    // doc0: { 0. "Soulier bleu", 1. "bla bla bla" }
+    // doc1: { 0. "Botte rouge", 1. "Soulier en cuir" }
+    #[test]
+    fn title_vs_description() {
+        let query_index0 = &[0];
+        let attribute0 = &[0];
+
+        let query_index1 = &[0];
+        let attribute1 = &[1];
+
+        let doc0 = sum_matches_attributes(query_index0, attribute0);
+        let doc1 = sum_matches_attributes(query_index1, attribute1);
+        assert_eq!(doc0.cmp(&doc1), Ordering::Less);
+    }
+}
diff --git a/meilidb-core/src/criterion/sum_of_words_position.rs b/meilidb-core/src/criterion/sum_of_words_position.rs
index e365aef3b..13f26774c 100644
--- a/meilidb-core/src/criterion/sum_of_words_position.rs
+++ b/meilidb-core/src/criterion/sum_of_words_position.rs
@@ -40,3 +40,25 @@ impl Criterion for SumOfWordsPosition {
         "SumOfWordsPosition"
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // typing: "soulier"
+    //
+    // doc0: "Soulier bleu"
+    // doc1: "Botte rouge et soulier noir"
+    #[test]
+    fn easy_case() {
+        let query_index0 = &[0];
+        let word_index0 = &[0];
+
+        let query_index1 = &[0];
+        let word_index1 = &[3];
+
+        let doc0 = sum_matches_attribute_index(query_index0, word_index0);
+        let doc1 = sum_matches_attribute_index(query_index1, word_index1);
+        assert_eq!(doc0.cmp(&doc1), Ordering::Less);
+    }
+}