diff --git a/unittest.cpp b/unittest.cpp
new file mode 100644
index 0000000..7ea135b
--- /dev/null
+++ b/unittest.cpp
@@ -0,0 +1,48 @@
+#define DOCTEST_CONFIG_NO_MULTITHREADING
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest.h"
+#include "histogram_internal.h"
+#include <vector>
+
+TEST_CASE("distinct positive numbers") {
+    double min = 0;
+    double max = 0;
+    find_minmax({1, 2}, min, max);
+    CHECK(min == 1);
+    CHECK(max == 2);
+    CHECK(find_minmax({1, 2}, min, max));
+}
+
+TEST_CASE("distinct negative numbers")
+{
+    double min = 0;
+    double max = 0;
+    find_minmax({-1, -2}, min, max);
+    CHECK(min == -2);
+    CHECK(max == -1);
+    CHECK(find_minmax({-1, -2}, min, max));
+}
+TEST_CASE("vector 1 element")
+{
+    double min = 0;
+    double max = 0;
+    find_minmax({1}, min, max);
+    CHECK(min == 1);
+    CHECK(max == 1);
+    CHECK(find_minmax({1}, min, max));
+}
+TEST_CASE("distinct equals numbers")
+{
+    double min = 0;
+    double max = 0;
+    find_minmax({1, 1}, min, max);
+    CHECK(min == 1);
+    CHECK(max == 1);
+    CHECK(find_minmax({1, 1}, min, max));
+}
+TEST_CASE("distinct empty vector")
+{
+    double min = -1;
+    double max = -1;
+    CHECK(!find_minmax({}, min, max));
+}