diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 41f75403..af859179 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -26,3 +26,4 @@ add_subdirectory(blocks)
 add_subdirectory(scratchconfiguration)
 add_subdirectory(assets)
 add_subdirectory(script)
+add_subdirectory(extensions)
diff --git a/test/extensions/CMakeLists.txt b/test/extensions/CMakeLists.txt
new file mode 100644
index 00000000..6b4d320b
--- /dev/null
+++ b/test/extensions/CMakeLists.txt
@@ -0,0 +1,17 @@
+# iextension_test
+add_executable(
+  iextension_test
+  iextension_test.cpp
+  testextension.cpp
+  testextension.h
+)
+
+target_link_libraries(
+  iextension_test
+  GTest::gtest_main
+  GTest::gmock_main
+  scratchcpp
+  scratchcpp_mocks
+)
+
+gtest_discover_tests(iextension_test)
diff --git a/test/extensions/iextension_test.cpp b/test/extensions/iextension_test.cpp
new file mode 100644
index 00000000..663553f4
--- /dev/null
+++ b/test/extensions/iextension_test.cpp
@@ -0,0 +1,37 @@
+#include <enginemock.h>
+
+#include "../common.h"
+#include "testextension.h"
+
+using namespace libscratchcpp;
+
+class IExtensionTest : public testing::Test
+{
+    public:
+        void SetUp() override { m_extension = std::make_unique<TestExtension>(); };
+
+        std::unique_ptr<IExtension> m_extension;
+        EngineMock m_engine;
+};
+
+TEST_F(IExtensionTest, Name)
+{
+    ASSERT_EQ(m_extension->name(), "Test");
+}
+
+TEST_F(IExtensionTest, Description)
+{
+    ASSERT_EQ(m_extension->description(), "Test extension");
+}
+
+TEST_F(IExtensionTest, IncludeByDefault)
+{
+    ASSERT_FALSE(m_extension->includeByDefault());
+}
+
+TEST_F(IExtensionTest, RegisterSections)
+{
+    std::shared_ptr<IBlockSection> section = nullptr;
+    EXPECT_CALL(m_engine, registerSection(section)).Times(1);
+    m_extension->registerSections(&m_engine);
+}
diff --git a/test/extensions/testextension.cpp b/test/extensions/testextension.cpp
new file mode 100644
index 00000000..20e3bb26
--- /dev/null
+++ b/test/extensions/testextension.cpp
@@ -0,0 +1,25 @@
+#include <scratchcpp/iengine.h>
+
+#include "testextension.h"
+
+using namespace libscratchcpp;
+
+std::string TestExtension::name() const
+{
+    return "Test";
+}
+
+std::string TestExtension::description() const
+{
+    return "Test extension";
+}
+
+bool TestExtension::includeByDefault() const
+{
+    return IExtension::includeByDefault();
+}
+
+void TestExtension::registerSections(IEngine *engine)
+{
+    engine->registerSection(nullptr);
+}
diff --git a/test/extensions/testextension.h b/test/extensions/testextension.h
new file mode 100644
index 00000000..7237f9e8
--- /dev/null
+++ b/test/extensions/testextension.h
@@ -0,0 +1,19 @@
+#pragma once
+
+#include <scratchcpp/iextension.h>
+
+namespace libscratchcpp
+{
+
+class TestExtension : public IExtension
+{
+    public:
+        std::string name() const override;
+        std::string description() const override;
+
+        bool includeByDefault() const override;
+
+        void registerSections(IEngine *engine) override;
+};
+
+} // namespace libscratchcpp