diff --git a/tdd_intro/homework/00_intro/test.cpp b/tdd_intro/homework/00_intro/test.cpp
index be6959b..57c75af 100644
--- a/tdd_intro/homework/00_intro/test.cpp
+++ b/tdd_intro/homework/00_intro/test.cpp
@@ -7,3 +7,39 @@ For example: input: "cool" output: "looc"
 */
 
 #include <gtest/gtest.h>
+
+const std::string g_testStringCool = "cool";
+const std::string g_testReverseStringCool = "looc";
+const std::string g_testString12345 = "12345";
+const std::string g_testReverseString12345 = "54321";
+const std::string g_testString123456 = "123456";
+const std::string g_testReverseString123456 = "654321";
+const std::string g_testOutOfScopeCaseString = "some random input to cover more cases";
+const std::string g_testReverseOutOfScopeCaseString = "sesac erom revoc ot tupni modnar emos";
+
+std::string ReverseAString(const std::string& target)
+{
+    std::string result(target);
+    std::reverse(result.begin(), result.end());
+    return result;
+}
+
+TEST(reverse, CheckCoolString)
+{
+    ASSERT_EQ(g_testReverseStringCool, ReverseAString(g_testStringCool));
+}
+
+TEST(reverse, Check12345String)
+{
+    ASSERT_EQ(g_testReverseString12345, ReverseAString(g_testString12345));
+}
+
+TEST(reverse, Check123456String)
+{
+    ASSERT_EQ(g_testReverseString123456, ReverseAString(g_testString123456));
+}
+
+TEST(reverse, CheckOtherString)
+{
+    ASSERT_EQ(g_testReverseOutOfScopeCaseString, ReverseAString(g_testOutOfScopeCaseString));
+}
diff --git a/tdd_intro/homework/homework.pro b/tdd_intro/homework/homework.pro
index cf6c01b..07506ca 100644
--- a/tdd_intro/homework/homework.pro
+++ b/tdd_intro/homework/homework.pro
@@ -1,6 +1,7 @@
 TEMPLATE = subdirs
 
 SUBDIRS += \
+    00_intro \
     01_leap_year \
     02_ternary_numbers \
     03_bank_ocr \