diff --git a/cmake/ftxui_test.cmake b/cmake/ftxui_test.cmake
index 3ed3bfa9b47e19e0f3011bc69a9313a5e307f4e9..d9d112c849f2c7702b3ea72ac5530b709bff6ae1 100644
--- a/cmake/ftxui_test.cmake
+++ b/cmake/ftxui_test.cmake
@@ -30,6 +30,7 @@ add_executable(tests
   src/ftxui/component/input_test.cpp
   src/ftxui/component/menu_test.cpp
   src/ftxui/component/radiobox_test.cpp
+  src/ftxui/component/resizable_split_test.cpp
   src/ftxui/component/receiver_test.cpp
   src/ftxui/component/screen_interactive_test.cpp
   src/ftxui/component/terminal_input_parser_test.cpp
diff --git a/src/ftxui/component/menu_test.cpp b/src/ftxui/component/menu_test.cpp
index a49aa388b7ca540dbfc94fb7b8327ca9e2696224..8f43b9b90005fa4cbb545f039ffb16936994ded0 100644
--- a/src/ftxui/component/menu_test.cpp
+++ b/src/ftxui/component/menu_test.cpp
@@ -14,6 +14,8 @@
 
 namespace ftxui {
 
+using namespace std::chrono_literals;
+
 TEST(MenuTest, RemoveEntries) {
   int focused_entry = 0;
   int selected = 0;
@@ -90,6 +92,84 @@ TEST(MenuTest, Directions) {
   }
 }
 
+TEST(MenuTest, AnimationsHorizontal) {
+  int selected = 0;
+  std::vector<std::string> entries = {"1", "2", "3"};
+  auto option = MenuOption::HorizontalAnimated();
+  auto menu = Menu(&entries, &selected, &option);
+  {
+    Screen screen(4, 3);
+    Render(screen, menu->Render());
+    EXPECT_EQ(
+        screen.ToString(),
+        "\x1B[1m\x1B[7m1\x1B[22m\x1B[27m \x1B[2m2\x1B[22m "
+        "\r\n\x1B[97m\x1B[49m\xE2\x94\x80\x1B[90m\x1B["
+        "49m\xE2\x95\xB6\xE2\x94\x80\xE2\x94\x80\x1B[39m\x1B[49m\r\n    ");
+  }
+  selected = 1;
+  {
+    Screen screen(4, 3);
+    Render(screen, menu->Render());
+    EXPECT_EQ(
+        screen.ToString(),
+        "\x1B[7m1\x1B[27m \x1B[1m2\x1B[22m "
+        "\r\n\x1B[97m\x1B[49m\xE2\x94\x80\x1B[90m\x1B["
+        "49m\xE2\x95\xB6\xE2\x94\x80\xE2\x94\x80\x1B[39m\x1B[49m\r\n    ");
+  }
+  animation::Params params(2s);
+  menu->OnAnimation(params);
+  {
+    Screen screen(4, 3);
+    Render(screen, menu->Render());
+    EXPECT_EQ(
+        screen.ToString(),
+        "\x1B[7m1\x1B[27m \x1B[1m2\x1B[22m "
+        "\r\n\x1B[90m\x1B[49m\xE2\x94\x80\xE2\x95\xB4\x1B[97m\x1B["
+        "49m\xE2\x94\x80\x1B[90m\x1B[49m\xE2\x95\xB6\x1B[39m\x1B[49m\r\n    ");
+  }
+}
+
+TEST(MenuTest, AnimationsVertical) {
+  int selected = 0;
+  std::vector<std::string> entries = {"1", "2", "3"};
+  auto option = MenuOption::VerticalAnimated();
+  auto menu = Menu(&entries, &selected, &option);
+  {
+    Screen screen(10, 3);
+    Render(screen, menu->Render());
+    EXPECT_EQ(
+        screen.ToString(),
+        "\x1B[90m\x1B[49m\xE2\x94\x82\x1B[1m\x1B[7m\x1B[39m\x1B[49m1\x1B["
+        "22m\x1B[27m        "
+        "\r\n\x1B[97m\x1B[49m\xE2\x95\xB7\x1B[2m\x1B[39m\x1B[49m2\x1B[22m      "
+        "  \r\n\x1B[97m\x1B[49m\xE2\x94\x82\x1B[2m\x1B[39m\x1B[49m3\x1B[22m    "
+        "    ");
+  }
+  selected = 1;
+  {
+    Screen screen(10, 3);
+    Render(screen, menu->Render());
+    EXPECT_EQ(
+        screen.ToString(),
+        "\x1B[90m\x1B[49m\xE2\x94\x82\x1B[7m\x1B[39m\x1B[49m1\x1B[27m        "
+        "\r\n\x1B[97m\x1B[49m\xE2\x95\xB7\x1B[1m\x1B[39m\x1B[49m2\x1B[22m      "
+        "  \r\n\x1B[97m\x1B[49m\xE2\x94\x82\x1B[2m\x1B[39m\x1B[49m3\x1B[22m    "
+        "    ");
+  }
+  animation::Params params(2s);
+  menu->OnAnimation(params);
+  {
+    Screen screen(10, 3);
+    Render(screen, menu->Render());
+    EXPECT_EQ(
+        screen.ToString(),
+        "\x1B[97m\x1B[49m\xE2\x95\xB5\x1B[7m\x1B[39m\x1B[49m1\x1B[27m        "
+        "\r\n\x1B[90m\x1B[49m\xE2\x94\x82\x1B[1m\x1B[39m\x1B[49m2\x1B[22m      "
+        "  \r\n\x1B[97m\x1B[49m\xE2\x95\xB7\x1B[2m\x1B[39m\x1B[49m3\x1B[22m    "
+        "    ");
+  }
+}
+
 }  // namespace ftxui
 
 // Copyright 2022 Arthur Sonzogni. All rights reserved.
diff --git a/src/ftxui/component/resizable_split_test.cpp b/src/ftxui/component/resizable_split_test.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f9b9f110955b8df22f4fdba80dee722d74e614db
--- /dev/null
+++ b/src/ftxui/component/resizable_split_test.cpp
@@ -0,0 +1,111 @@
+#include <gtest/gtest-message.h>  // for Message
+#include <gtest/gtest-test-part.h>  // for TestPartResult, SuiteApiResolver, TestFactoryImpl
+#include <memory>  // for __shared_ptr_access, shared_ptr, allocator
+#include <string>  // for string, basic_string
+#include <vector>  // for vector
+
+#include "ftxui/component/captured_mouse.hpp"     // for ftxui
+#include "ftxui/component/component.hpp"          // for Radiobox
+#include "ftxui/component/component_base.hpp"     // for ComponentBase
+#include "ftxui/component/component_options.hpp"  // for RadioboxOption
+#include "ftxui/component/event.hpp"  // for Event, Event::Return, Event::ArrowDown, Event::ArrowUp, Event::Tab, Event::TabReverse
+#include "ftxui/util/ref.hpp"         // for Ref
+#include "gtest/gtest_pred_impl.h"    // for EXPECT_EQ, Test, TEST
+
+namespace ftxui {
+
+namespace {
+Component BasicComponent() {
+  return Renderer([] { return text(""); });
+}
+
+Event MousePressed(int x, int y) {
+  Mouse mouse;
+  mouse.button = Mouse::Left;
+  mouse.motion = Mouse::Pressed;
+  mouse.shift = false;
+  mouse.meta = false;
+  mouse.control = false;
+  mouse.x = x;
+  mouse.y = y;
+  return Event::Mouse("jjj", mouse);
+}
+
+Event MouseReleased(int x, int y) {
+  Mouse mouse;
+  mouse.button = Mouse::Left;
+  mouse.motion = Mouse::Released;
+  mouse.shift = false;
+  mouse.meta = false;
+  mouse.control = false;
+  mouse.x = x;
+  mouse.y = y;
+  return Event::Mouse("jjj", mouse);
+}
+}  // namespace
+
+TEST(ResizableSplit, BasicLeft) {
+  int position = 3;
+  auto component =
+      ResizableSplitLeft(BasicComponent(), BasicComponent(), &position);
+  auto screen = Screen(20, 20);
+  Render(screen, component->Render());
+  EXPECT_EQ(position, 3);
+  EXPECT_TRUE(component->OnEvent(MousePressed(3, 1)));
+  EXPECT_EQ(position, 3);
+  EXPECT_TRUE(component->OnEvent(MousePressed(10, 1)));
+  EXPECT_EQ(position, 10);
+  EXPECT_TRUE(component->OnEvent(MouseReleased(10, 1)));
+  EXPECT_EQ(position, 10);
+}
+
+TEST(ResizableSplit, BasicRight) {
+  int position = 3;
+  auto component =
+      ResizableSplitRight(BasicComponent(), BasicComponent(), &position);
+  auto screen = Screen(20, 20);
+  Render(screen, component->Render());
+  EXPECT_EQ(position, 3);
+  EXPECT_TRUE(component->OnEvent(MousePressed(16, 1)));
+  EXPECT_EQ(position, 3);
+  EXPECT_TRUE(component->OnEvent(MousePressed(10, 1)));
+  EXPECT_EQ(position, 9);
+  EXPECT_TRUE(component->OnEvent(MouseReleased(10, 1)));
+  EXPECT_EQ(position, 9);
+}
+
+TEST(ResizableSplit, BasicTop) {
+  int position = 3;
+  auto component =
+      ResizableSplitTop(BasicComponent(), BasicComponent(), &position);
+  auto screen = Screen(20, 20);
+  Render(screen, component->Render());
+  EXPECT_EQ(position, 3);
+  EXPECT_TRUE(component->OnEvent(MousePressed(1, 3)));
+  EXPECT_EQ(position, 3);
+  EXPECT_TRUE(component->OnEvent(MousePressed(1, 10)));
+  EXPECT_EQ(position, 10);
+  EXPECT_TRUE(component->OnEvent(MouseReleased(1, 10)));
+  EXPECT_EQ(position, 10);
+}
+
+TEST(ResizableSplit, BasicBottom) {
+  int position = 3;
+  auto component =
+      ResizableSplitBottom(BasicComponent(), BasicComponent(), &position);
+  auto screen = Screen(20, 20);
+  Render(screen, component->Render());
+  EXPECT_EQ(position, 3);
+  EXPECT_TRUE(component->OnEvent(MousePressed(1, 16)));
+  EXPECT_EQ(position, 3);
+  EXPECT_TRUE(component->OnEvent(MousePressed(1, 10)));
+  EXPECT_EQ(position, 9);
+  EXPECT_TRUE(component->OnEvent(MouseReleased(1, 10)));
+  EXPECT_EQ(position, 9);
+}
+
+}  // namespace ftxui
+
+// Copyright 2022 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.
diff --git a/tools/iwyu.sh b/tools/iwyu.sh
index 88da55e35ce77514c794d3bc9a12b9ffa238405c..209fc8cab0088007f417906c1235e39c2fdd75fc 100755
--- a/tools/iwyu.sh
+++ b/tools/iwyu.sh
@@ -8,6 +8,7 @@ rm * -rf
 echo $CMAKE_CXX_INCLUDE_WHAT_YOU_USE
 cmake .. -DFTXUI_BUILD_TESTS=ON -DCMAKE_CXX_INCLUDE_WHAT_YOU_USE="include-what-you-use;-Xiwyu;--cxx17ns;-Xiwyu;--mapping_file=${mapping_dir}/iwyu.imp;-Xiwyu;--verbose=3"
 make -j 2>out
-fix_includes.py --comments < out
+#fix_includes.py --comments < out
+fix_include --comments < out
 
 ../tools/format.sh