one more test test

unittest.cpp

@@ -34,3 +34,11 @@ TEST_CASE("negative elements") {
     CHECK(min == -81);
     CHECK(max == 2);
 }
+
+TEST_CASE("same element") {
+    double min = 0;
+    double max = 0;
+    find_minmax({ 1, 1, 1, 1, 1, 1, 1, 1, 1 }, min, max);
+    CHECK(min == 1);
+    CHECK(max == 1);
+}