diff --git a/unittest_personal.cpp b/unittest_personal.cpp
new file mode 100644
index 0000000..0844e90
--- /dev/null
+++ b/unittest_personal.cpp
@@ -0,0 +1,20 @@
+#define DOCTEST_CONFIG_NO_MULTITHREADING
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest.h"
+#include "input_colors_internal.h"
+
+TEST_CASE("Mistakes in spelling") {
+    std::string colors_stroke = "black";
+    std::string colors_fill = "green";
+    input_colors(colors_stroke, colors_fill);
+    CHECK(colors_stroke == "yellow");
+    CHECK(colors_fill == "pink");
+}
+
+TEST_CASE("The answer is No") {
+    std::string colors_stroke = "black";
+    std::string colors_fill = "green";
+    input_colors(colors_stroke, colors_fill);
+    CHECK(colors_stroke == "black");
+    CHECK(colors_fill == "green");
+}