test: unit-тесты функции find_minmax()

.gitignore

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+//
+//  Untitled.hpp
+//  Gistogramma
+//
+//  Created by MacBook Pro on 01.05.2025.
+//
+

histogram_internal.hpp

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+#ifndef histogram_internal_h
+#define histogram_internal_h
+#include <vector>
+
+void find_minmax(const std::vector<double>& numbers, double& minimum, double& maximum);
+
+#endif /* histogram_internal_h */

unittest.cpp

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+#define DOCTEST_CONFIG_NO_MULTITHREADING
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest.h"
+#include "histogram_internal.hpp"
+
+using namespace std;
+
+TEST_CASE("distinct positive numbers") {
+    double min = 0;
+    double max = 0;
+    find_minmax({1, 2}, min, max);
+    CHECK(min == 1);
+    CHECK(max == 2);
+}
+
+TEST_CASE("empty vector"){
+    double min = 0;
+    double max = 0;
+    vector<double> empty(3);
+    find_minmax(empty, min, max);
+    CHECK(min == 0);
+    CHECK(max == 0);
+}
+
+TEST_CASE("single vector"){
+    double min = 0;
+    double max = 0;
+    vector<double> single = {3};
+    find_minmax(single, min, max);
+    CHECK(min == 3);
+    CHECK(max == 3);
+}
+
+TEST_CASE("negative vector"){
+    double min = 0;
+    double max = 0;
+    vector<double> negative = {-1, -2};
+    find_minmax(negative, min, max);
+    CHECK(min == -2);
+    CHECK(max == -1);
+}
+
+TEST_CASE("identical vector"){
+    double min = 0;
+    double max = 0;
+    vector<double> identical = {1, 1};
+    find_minmax(identical, min, max);
+    CHECK(min == 1);
+    CHECK(max == 1);
+}