diff --git a/sem2_lab1/sem2_lab1.vcxproj b/sem2_lab1/sem2_lab1.vcxproj
index f8d47d6..e229c97 100644
--- a/sem2_lab1/sem2_lab1.vcxproj
+++ b/sem2_lab1/sem2_lab1.vcxproj
@@ -137,7 +137,6 @@
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="histogram.h" />
-    <ClInclude Include="histogram_internal.h" />
     <ClInclude Include="show_histogram.h" />
     <ClInclude Include="svg.h" />
   </ItemGroup>
diff --git a/sem2_lab1/sem2_lab1.vcxproj.filters b/sem2_lab1/sem2_lab1.vcxproj.filters
index 46a52d6..d5b05fc 100644
--- a/sem2_lab1/sem2_lab1.vcxproj.filters
+++ b/sem2_lab1/sem2_lab1.vcxproj.filters
@@ -35,13 +35,10 @@
     <ClInclude Include="histogram.h">
       <Filter>Файлы заголовков</Filter>
     </ClInclude>
-    <ClInclude Include="show_histogram.h">
-      <Filter>Файлы заголовков</Filter>
-    </ClInclude>
-    <ClInclude Include="histogram_internal.h">
+    <ClInclude Include="svg.h">
       <Filter>Файлы заголовков</Filter>
     </ClInclude>
-    <ClInclude Include="svg.h">
+    <ClInclude Include="show_histogram.h">
       <Filter>Файлы заголовков</Filter>
     </ClInclude>
   </ItemGroup>
diff --git a/sem2_lab1/svg.cpp b/sem2_lab1/svg.cpp
index 4eaf174..37241d4 100644
--- a/sem2_lab1/svg.cpp
+++ b/sem2_lab1/svg.cpp
@@ -21,6 +21,13 @@ void svg_rect(double x, double y, double width, double height,string stroke = "b
 {
     cout << "<rect x='" << x << "' y='" << y << "' width='" << width << "' height='" << height << "' fill='" << fill << "' stroke='" << stroke << "' />";
 }
+int GetProc(int number_cnt, int bin)
+{
+    if (number_cnt <= 0) return 0;
+    if (bin < 0) return 0;
+    return 100.0 * bin / number_cnt;
+}
+
 void show_histogram_svg(const vector<double>& bins, int number_cnt) {
     const auto IMAGE_WIDTH = 400;
     const auto IMAGE_HEIGHT = 300;
@@ -40,7 +47,7 @@ void show_histogram_svg(const vector<double>& bins, int number_cnt) {
     for (size_t bin : bins) {
         const double bin_width = k * bin;
         svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
-        svg_text(IMAGE_WIDTH - TEXT_WIDTH + TEXT_LEFT, top + TEXT_BASELINE, to_string((int)((100.0 / (double)number_cnt) * (double)bin)) + "%");
+        svg_text(IMAGE_WIDTH - TEXT_WIDTH + TEXT_LEFT, top + TEXT_BASELINE, to_string(GetProc(number_cnt,bin)) + "%");
         svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT,"black",colors[color_ptr]);
         top += BIN_HEIGHT;
         color_ptr++;
diff --git a/sem2_lab1/histogram_internal.h b/unittest/histogram_internal.h
similarity index 100%
rename from sem2_lab1/histogram_internal.h
rename to unittest/histogram_internal.h
diff --git a/unittest/svg_internal.h b/unittest/svg_internal.h
new file mode 100644
index 0000000..f12ca1b
--- /dev/null
+++ b/unittest/svg_internal.h
@@ -0,0 +1,2 @@
+#pragma once
+int GetProc(int number_cnt, int bin);
\ No newline at end of file
diff --git a/unittest/unittest.cpp b/unittest/unittest.cpp
index 33bc40c..4a8a610 100644
--- a/unittest/unittest.cpp
+++ b/unittest/unittest.cpp
@@ -4,7 +4,8 @@
 #define DOCTEST_CONFIG_NO_MULTITHREADING
 #define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
 #include "doctest.h"
-#include "../sem2_lab1/histogram_internal.h"
+#include "histogram_internal.h"
+#include "svg_internal.h"
 
 TEST_CASE("distinct positive numbers") {
     double min = 0;
@@ -44,6 +45,35 @@ TEST_CASE("equal items") {
     CHECK(max == -6);
 
 }
+
+TEST_CASE("Test SVG normal") {
+    int numb_cnt = 100;
+    int bin = 44;
+    int Proc = GetProc(numb_cnt, bin);
+    CHECK(Proc == 44);
+}
+
+TEST_CASE("Test SVG zero") {
+    int numb_cnt = 0;
+    int bin = 33;
+    int Proc = GetProc(numb_cnt, bin);
+    CHECK(Proc == 0);
+}
+
+TEST_CASE("Test SVG less zero 1") {
+    int numb_cnt = -23;
+    int bin = 55;
+    int Proc = GetProc(numb_cnt, bin);
+    CHECK(Proc == 0);
+}
+
+TEST_CASE("Test SVG less zero 2") {
+    int numb_cnt = 100;
+    int bin = -23;
+    int Proc = GetProc(numb_cnt, bin);
+    CHECK(Proc == 0);
+}
+
 // Запуск программы: CTRL+F5 или меню "Отладка" > "Запуск без отладки"
 // Отладка программы: F5 или меню "Отладка" > "Запустить отладку"
 
diff --git a/unittest/unittest.vcxproj b/unittest/unittest.vcxproj
index a7bdf39..e14b82f 100644
--- a/unittest/unittest.vcxproj
+++ b/unittest/unittest.vcxproj
@@ -128,11 +128,13 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="..\sem2_lab1\histogram.cpp" />
+    <ClCompile Include="..\sem2_lab1\svg.cpp" />
     <ClCompile Include="unittest.cpp" />
   </ItemGroup>
   <ItemGroup>
-    <ClInclude Include="..\sem2_lab1\histogram_internal.h" />
     <ClInclude Include="doctest.h" />
+    <ClInclude Include="histogram_internal.h" />
+    <ClInclude Include="svg_internal.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
diff --git a/unittest/unittest.vcxproj.filters b/unittest/unittest.vcxproj.filters
index 75d3831..b482a01 100644
--- a/unittest/unittest.vcxproj.filters
+++ b/unittest/unittest.vcxproj.filters
@@ -21,12 +21,18 @@
     <ClCompile Include="..\sem2_lab1\histogram.cpp">
       <Filter>Исходные файлы</Filter>
     </ClCompile>
+    <ClCompile Include="..\sem2_lab1\svg.cpp">
+      <Filter>Исходные файлы</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
-    <ClInclude Include="..\sem2_lab1\histogram_internal.h">
+    <ClInclude Include="doctest.h">
       <Filter>Файлы заголовков</Filter>
     </ClInclude>
-    <ClInclude Include="doctest.h">
+    <ClInclude Include="svg_internal.h">
+      <Filter>Файлы заголовков</Filter>
+    </ClInclude>
+    <ClInclude Include="histogram_internal.h">
       <Filter>Файлы заголовков</Filter>
     </ClInclude>
   </ItemGroup>