diff --git a/unittest.cpp b/unittest.cpp
index a317f71..13ed78d 100644
--- a/unittest.cpp
+++ b/unittest.cpp
@@ -1,7 +1,9 @@
 #define DOCTEST_CONFIG_NO_MULTITHREADING
 #define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
 #include "doctest.h"
+#include <vector>
 #include "histogram_internal.h"
+using namespace std;
 
 TEST_CASE("distinct positive numbers") {
     double min = 0;
@@ -9,4 +11,45 @@ TEST_CASE("distinct positive numbers") {
     FindMinMax({ 1, 2 }, min, max);
     CHECK(min == 1);
     CHECK(max == 2);
+}
+
+/*
+Если вектор пуст, искусственно добавляем в него значения
+Проверяем, равны ли min и max этим искусственным значениям
+*/
+TEST_CASE("empty vector") {
+    double min = 0;
+    double max = 0;
+    vector <double> fortest;
+    if (fortest.size() == 0) {
+        fortest.push_back(90);
+        fortest.push_back(100);
+    }
+    FindMinMax(fortest, min, max);
+    CHECK(min != 90);
+    CHECK(max != 100);
+}
+
+TEST_CASE("one element") {
+    double min = 0;
+    double max = 0;
+    FindMinMax({ 1 }, min, max);
+    CHECK(min == 1);
+    CHECK(max == 1);
+}
+
+TEST_CASE("negative elements") {
+    double min = 0;
+    double max = 0;
+    FindMinMax({ -81, 2 }, min, max);
+    CHECK(min == -81);
+    CHECK(max == 2);
+}
+
+TEST_CASE("simular elements") {
+    double min = 0;
+    double max = 0;
+    FindMinMax({ 23, 23, 23 }, min, max);
+    CHECK(min == 23);
+    CHECK(max == 23);
 }
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