diff --git a/src/tests/index_test.rs b/src/tests/index_test.rs
index b5012fc..a6972c1 100644
--- a/src/tests/index_test.rs
+++ b/src/tests/index_test.rs
@@ -29,4 +29,53 @@ mod index_test {
             println!("Found Row: {}", pretty_print.unwrap());
         }
     }
+
+    #[test]
+    fn should_create_reverse_index() {
+        let indexes = hashmap!["race" => Index::new("race".to_string(), Some(true), Some(false))];
+        let mut table: Table = Table::new("Cats", "id", Some(indexes));
+        let _ = table.insert_row(row!["id" => 1, "name" => "Ozzy", "race" => "cat"]);
+        _ = table.insert_row(row!["id" => 2, "name" => "Simon", "race" => "cat"]);
+        _ = table.insert_row(row!["id" => 3, "name" => "Gosa", "race" => "dog"]);
+
+        let result = table.get_pks_by_index("race".to_string(), json!("cat"));
+
+        assert_eq!(result.is_ok(), true);
+
+        let ids = result.unwrap();
+        assert_eq!(ids, vec![2, 1]);
+    }
+
+    #[test]
+    fn should_create_unique_index_and_fail_insert() {
+        let indexes = hashmap!["race" => Index::new("race".to_string(), Some(false), Some(true))];
+        let mut table: Table = Table::new("Cats", "id", Some(indexes));
+        let _ = table.insert_row(row!["id" => 1, "name" => "Ozzy", "race" => "cat"]);
+        _ = table.insert_row(row!["id" => 3, "name" => "Gosa", "race" => "dog"]);
+
+        let err = table.insert_row(row!["id" => 2, "name" => "Simon", "race" => "cat"]);
+        assert_eq!(err.is_err(), true);
+    }
+
+    #[test]
+    fn should_create_unique_index() {
+        let indexes = hashmap!["race" => Index::new("race".to_string(), Some(false), Some(true))];
+        let mut table: Table = Table::new("Cats", "id", Some(indexes));
+        let _ = table.insert_row(row!["id" => 1, "name" => "Ozzy", "race" => "cat"]);
+        _ = table.insert_row(row!["id" => 3, "name" => "Gosa", "race" => "dog"]);
+
+        let result = table.get_pks_by_index("race".to_string(), json!("cat"));
+
+        assert_eq!(result.is_ok(), true);
+
+        let ids = result.unwrap();
+        assert_eq!(ids, vec![1]);
+
+        let result = table.get_pks_by_index("race".to_string(), json!("dog"));
+
+        assert_eq!(result.is_ok(), true);
+
+        let ids = result.unwrap();
+        assert_eq!(ids, vec![3]);
+    }
 }