code: сделал тест на пустой вектор

project/histogram.cpp

@@ -6,17 +6,24 @@ using namespace std;
 
 void find_minmax(vector<double> numbers, double& min, double& max)
 {
-    min = numbers[0];
-    max = numbers[0];
-    for (double x : numbers)
+    if (numbers.empty())
     {
-        if (x < min)
-        {
-            min = x;
-        }
-        else if (x > max)
+        min = max = 0;
+    }
+    else
+    {
+        min = numbers[0];
+        max = numbers[0];
+        for (double x : numbers)
         {
-            max = x;
+            if (x < min)
+            {
+                min = x;
+            }
+            else if (x > max)
+            {
+                max = x;
+            }
         }
     }
     return;

unittest.cpp

@@ -34,7 +34,8 @@ TEST_CASE("vector with same elements") {
 TEST_CASE("void vector") {
     double min = 0;
     double max = 0;
-    find_minmax({0}, min, max);
+    std::vector<double> numbers {};
+    find_minmax( numbers, min, max);
     CHECK(min == 0);
     CHECK(max == 0);
 }