diff --git a/docker/run_tasks/run_style_check.sh b/docker/run_tasks/run_style_check.sh
new file mode 100644
index 0000000..9a41364
--- /dev/null
+++ b/docker/run_tasks/run_style_check.sh
@@ -0,0 +1,6 @@
+# get the current directory
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+# go up two directories
+cd $DIR/../..
+
+cpplint --extensions=h,hpp,cpp,c --exclude=build --exclude=cmake-build-debug --recursive --linelength=120 --filter=-build/include_subdir,-legal/copyright --output=vs7 .
diff --git a/docs/ide.md b/docs/ide.md
new file mode 100644
index 0000000..41fd459
--- /dev/null
+++ b/docs/ide.md
@@ -0,0 +1,8 @@
+# Если у вас Clion
+1. Установите самую свежую версию [CLion](https://www.jetbrains.com/ru-ru/clion/). CLion поддерживает тулчейн Docker начиная с версии 2021.3.
+2. Установите [Docker](https://www.docker.com/).
+3. Откройте проект в CLion.
+4. Создайте docker-toolchain в CLion.
+![toolchains.png](toolchains.png)
+5. Если все будет хорошо Clion сама подтянет все пути
+![toolchains2.png](toolchains2.png)
\ No newline at end of file
diff --git a/docs/toolchains.png b/docs/toolchains.png
new file mode 100644
index 0000000..f8562b3
Binary files /dev/null and b/docs/toolchains.png differ
diff --git a/docs/toolchains2.png b/docs/toolchains2.png
new file mode 100644
index 0000000..acea680
Binary files /dev/null and b/docs/toolchains2.png differ
diff --git a/tasks/CMakeLists.txt b/tasks/CMakeLists.txt
index b308d86..a3ee107 100644
--- a/tasks/CMakeLists.txt
+++ b/tasks/CMakeLists.txt
@@ -1,2 +1 @@
-
 add_subdirectory(task_basic_c)
diff --git a/tasks/task_basic_c/task_str2int/str2int_tests.cpp b/tasks/task_basic_c/task_str2int/str2int_tests.cpp
index 1f072ab..5ec93d1 100644
--- a/tasks/task_basic_c/task_str2int/str2int_tests.cpp
+++ b/tasks/task_basic_c/task_str2int/str2int_tests.cpp
@@ -14,14 +14,20 @@ TEST(str2int, BasicTestZeroNext) {
     EXPECT_DEATH(str2int("-"), "");
 }
 
-//    TEST(str2int, BasicTest1) {
-//        EXPECT_EQ(str2int("1"), 1);
-//    }
-//
-//    TEST(str2int, BasicTestPlus1) {
-//        EXPECT_EQ(str2int("+1"), 1);
-//    }
-//
-//    TEST(str2int, BasicTestMinus1) {
-//        EXPECT_EQ(str2int("-1"), -1);
-//    }
+TEST(str2int, BasicTestEmptyString) {
+    EXPECT_DEATH(str2int(""), "");
+}
+
+TEST(str2int, BasicTestNumbers) {
+    EXPECT_EQ(str2int("-5"), -5);
+    EXPECT_EQ(str2int("-66"), -66);
+    EXPECT_EQ(str2int("-123"), -123);
+    EXPECT_EQ(str2int("2147483647"), 2147483647);
+    EXPECT_EQ(str2int("-2147483648"), -2147483648);
+}
+
+TEST(str2int, BasicTestDeath) {
+    EXPECT_DEATH(str2int("-2147483649"), "");
+    EXPECT_DEATH(str2int("2147483648"), "");
+    EXPECT_DEATH(str2int("214748364999"), "");
+}