diff --git a/.gitignore b/.gitignore
index e7910eb..95c1f92 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,5 +2,6 @@
 /obj
 /lab01.depend
 /lab01.layout
-/main.exe
 /main.o
+/main.exe
+/unittest.layout
diff --git a/lab01.cbp b/lab01.cbp
index cc05dde..2b92edc 100644
--- a/lab01.cbp
+++ b/lab01.cbp
@@ -33,9 +33,12 @@
 			<Add option="-fexceptions" />
 		</Compiler>
 		<Unit filename=".gitignore" />
-		<Unit filename="Header.cpp" />
-		<Unit filename="Header.h" />
+		<Unit filename="histogram.cpp" />
+		<Unit filename="histogram.h" />
+		<Unit filename="histogram_internal.h" />
 		<Unit filename="main.cpp" />
+		<Unit filename="svg.cpp" />
+		<Unit filename="svg.h" />
 		<Unit filename="text.cpp" />
 		<Unit filename="text.h" />
 		<Extensions>
diff --git a/main.cpp b/main.cpp
index 558fb56..0672980 100644
--- a/main.cpp
+++ b/main.cpp
@@ -6,23 +6,23 @@ struct Input {
     vector<double> vec;
     size_t korz{};
 };
-Input input_data() {
-    Input in;
+
+Input input_data(istream& in) {
+    Input lin;
     size_t n, korz;
 
     cerr << "Number of elements: ";
-    cin >> n;
-    in.vec.resize(n);
-    cerr << "Elements: ";
+    in >> n;
+    lin.vec.resize(n);
     for (size_t i = 0; i < n; i++)
-        cin >> in.vec[i];
+        in >> lin.vec[i];
     cerr << "Enter bin count: ";
-    cin >> in.korz;
-    return in;
+    in >> lin.korz;
+    return lin;
 }
 
 int main() {
-    auto in = input_data();
+    auto in = input_data(cin);
     auto bins = make_histogram(in.korz, in.vec);
     show_histogram_svg(bins);
 }
diff --git a/unittest.cbp b/unittest.cbp
index 6da4486..379d0a2 100644
--- a/unittest.cbp
+++ b/unittest.cbp
@@ -31,6 +31,10 @@
 		<Compiler>
 			<Add option="-Wall" />
 		</Compiler>
+		<Unit filename="doctest.h" />
+		<Unit filename="histogram.cpp" />
+		<Unit filename="histogram_internal.h" />
+		<Unit filename="unittest.cpp" />
 		<Extensions />
 	</Project>
 </CodeBlocks_project_file>