diff --git a/unittest.cpp b/unittest.cpp
index 4f8dc54..97ab3f9 100644
--- a/unittest.cpp
+++ b/unittest.cpp
@@ -2,7 +2,7 @@
 #define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
 #include "doctest.h"
 #include "histogram_internal.h"
-
+#include "verif.h"
 TEST_CASE("distinct positive numbers") {
     double min = 0;
     double max = 0;
@@ -38,3 +38,20 @@ TEST_CASE("identical elements") {
     CHECK (min == 1);
     CHECK (max == 1);
 }
+
+TEST_CASE("distinct interval1") {
+    double interval = 5;
+    bool check;
+    verification(check);
+    CHECK (check == true);
+
+}
+
+TEST_CASE("distinct interval2") {
+    double interval = 10;
+    bool check;
+    verification(check);
+    CHECK (check == false);
+
+}
+