code: изменили тест на пустой вектор

histogram.cpp

@@ -2,14 +2,20 @@
 #include <conio.h>
 #include <vector>
 #include <stdlib.h>
-using namespace std;
 #include "histogram.h"
 
-void
+using namespace std;
+
+bool
 find_minmax(const vector<double>& numbers, double& min, double& max){
+    if (numbers.empty()){
+        return false;
+    }
+
     min = numbers[0];
-    min = numbers[0];
-    for(size_t i=0; i < numbers.size(); i++){
+    max = numbers[0];
+    for(size_t i=0; i < numbers.size(); i++)
+    {
         if (numbers[i] < min)
         {
             min = numbers[i];
@@ -19,6 +25,8 @@ find_minmax(const vector<double>& numbers, double& min, double& max){
             max = numbers[i];
         }
     }
+
+    return true;
 }
 
 

histogram_internal.h

@@ -0,0 +1,8 @@
+#ifndef HISTOGRAM_INTERNAL_H_INCLUDED
+#define HISTOGRAM_INTERNAL_H_INCLUDED
+
+#include <vector>
+bool
+find_minmax(const std::vector<double>& numbers, double& min, double& max);
+
+#endif // HISTOGRAM_INTERNAL_H_INCLUDED

unittest.cpp

@@ -14,9 +14,7 @@ TEST_CASE("distinct positive numbers") {
 TEST_CASE("empty vector"){
     double min = 0;
     double max = 0;
-    find_minmax({ NULL }, min, max);
-    CHECK(min == 0);
-    CHECK(max == 0);
+    CHECK(!find_minmax({}, min, max));
 }
 
 TEST_CASE("same elements"){
@@ -24,7 +22,6 @@ TEST_CASE("same elements"){
     double max = 0;
     find_minmax({ 1, 1 }, min, max);
     CHECK(min == max);
-    CHECK(max == min);
 }
 
 TEST_CASE("only one number"){