diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8fe4dc8..dc27c3d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,6 +20,8 @@ enable_testing()
 include(GoogleTest)
 enable_fuzz_testing()
 
-add_subdirectory(src/simple_examples)
-add_subdirectory(src/state_example)
-add_subdirectory(src/advanced_examples)
+# add_subdirectory(src/simple_examples)
+# add_subdirectory(src/state_example)
+# add_subdirectory(src/advanced_examples)
+# add_subdirectory(src/cpp-inheritance)
+add_subdirectory(src/complex_test_fixture)
diff --git a/src/complex_test_fixture/CMakeLists.txt b/src/complex_test_fixture/CMakeLists.txt
new file mode 100644
index 0000000..c5cb5f4
--- /dev/null
+++ b/src/complex_test_fixture/CMakeLists.txt
@@ -0,0 +1,6 @@
+add_subdirectory(metrics)
+add_subdirectory(publishers)
+add_subdirectory(subscribers)
+add_subdirectory(base)
+add_subdirectory(child)
+add_subdirectory(test)
\ No newline at end of file
diff --git a/src/complex_test_fixture/base/Activity.cpp b/src/complex_test_fixture/base/Activity.cpp
new file mode 100644
index 0000000..92ed93a
--- /dev/null
+++ b/src/complex_test_fixture/base/Activity.cpp
@@ -0,0 +1,16 @@
+#include "Activity.h"
+
+#include <iostream>
+
+void Activity::Init() {
+    std::cout << "Activity::Init()" << std::endl;
+}
+
+void Activity::Step() {
+    std::cout << "Activity::Step()" << std::endl;
+    step_count_++;
+    if (step_count_ > 10) {
+        *(char *)0xdeadc0de = 0;
+    }
+    processStep();
+}
diff --git a/src/complex_test_fixture/base/Activity.h b/src/complex_test_fixture/base/Activity.h
new file mode 100644
index 0000000..03a7814
--- /dev/null
+++ b/src/complex_test_fixture/base/Activity.h
@@ -0,0 +1,15 @@
+#pragma once
+
+class Activity {
+public:
+    Activity() = default;
+    virtual ~Activity() = default;
+
+    void Init();
+    void Step();
+
+protected:
+    virtual void processStep() = 0; // Pure virtual function
+private:
+    int step_count_ = 0;
+};
diff --git a/src/complex_test_fixture/base/CMakeLists.txt b/src/complex_test_fixture/base/CMakeLists.txt
new file mode 100644
index 0000000..27b44cf
--- /dev/null
+++ b/src/complex_test_fixture/base/CMakeLists.txt
@@ -0,0 +1,3 @@
+add_library(activity STATIC Activity.cpp)
+
+target_include_directories(activity PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
\ No newline at end of file
diff --git a/src/complex_test_fixture/child/CMakeLists.txt b/src/complex_test_fixture/child/CMakeLists.txt
new file mode 100644
index 0000000..aa0d0dc
--- /dev/null
+++ b/src/complex_test_fixture/child/CMakeLists.txt
@@ -0,0 +1,5 @@
+add_library(child_activity STATIC ChildActivity.cpp)
+
+target_include_directories(child_activity PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+
+target_link_libraries(child_activity PUBLIC activity)
diff --git a/src/complex_test_fixture/child/ChildActivity.cpp b/src/complex_test_fixture/child/ChildActivity.cpp
new file mode 100644
index 0000000..3f0282f
--- /dev/null
+++ b/src/complex_test_fixture/child/ChildActivity.cpp
@@ -0,0 +1,9 @@
+#include "ChildActivity.h"
+
+#include <iostream>
+
+ChildActivity::ChildActivity() {}
+
+void ChildActivity::processStep() {
+    std::cout << "ChildActivity::processStep()" << std::endl; 
+}
diff --git a/src/complex_test_fixture/child/ChildActivity.h b/src/complex_test_fixture/child/ChildActivity.h
new file mode 100644
index 0000000..b592a6a
--- /dev/null
+++ b/src/complex_test_fixture/child/ChildActivity.h
@@ -0,0 +1,10 @@
+#pragma once
+#include "Activity.h"
+
+class ChildActivity final : public Activity {
+public:
+    ChildActivity();  
+
+protected:
+    void processStep() override;
+};
diff --git a/src/complex_test_fixture/metrics/CMakeLists.txt b/src/complex_test_fixture/metrics/CMakeLists.txt
new file mode 100644
index 0000000..5a5cb5a
--- /dev/null
+++ b/src/complex_test_fixture/metrics/CMakeLists.txt
@@ -0,0 +1,3 @@
+add_library(metrics STATIC metricA.cpp metricB.cpp)
+
+target_include_directories(metrics PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
\ No newline at end of file
diff --git a/src/complex_test_fixture/metrics/metric.h b/src/complex_test_fixture/metrics/metric.h
new file mode 100644
index 0000000..eb0d2fc
--- /dev/null
+++ b/src/complex_test_fixture/metrics/metric.h
@@ -0,0 +1,9 @@
+#pragma once
+
+class Metric {
+ public:
+  virtual ~Metric() = default;
+  virtual void Set(int value) = 0;
+  virtual int Get() const = 0;
+  virtual void Reset() = 0;
+};
\ No newline at end of file
diff --git a/src/complex_test_fixture/metrics/metricA.cpp b/src/complex_test_fixture/metrics/metricA.cpp
new file mode 100644
index 0000000..afc00a0
--- /dev/null
+++ b/src/complex_test_fixture/metrics/metricA.cpp
@@ -0,0 +1,13 @@
+#include "metricA.h"
+
+void MetricA::Set(int value) {
+  value_ = value;
+}
+
+int MetricA::Get() const {
+  return value_;
+}
+
+void MetricA::Reset() {
+  value_ = 0;
+}
\ No newline at end of file
diff --git a/src/complex_test_fixture/metrics/metricA.h b/src/complex_test_fixture/metrics/metricA.h
new file mode 100644
index 0000000..d829708
--- /dev/null
+++ b/src/complex_test_fixture/metrics/metricA.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include "metric.h"
+
+class MetricA : public Metric {
+ public:
+  explicit MetricA(int value) : value_(value) {};
+  virtual ~MetricA() = default;
+  void Set(int value) override;
+  int Get() const override;
+  void Reset() override;
+
+ private:
+    int value_{0};
+};
\ No newline at end of file
diff --git a/src/complex_test_fixture/metrics/metricB.cpp b/src/complex_test_fixture/metrics/metricB.cpp
new file mode 100644
index 0000000..2e3eae9
--- /dev/null
+++ b/src/complex_test_fixture/metrics/metricB.cpp
@@ -0,0 +1,13 @@
+#include "metricB.h"
+
+void MetricB::Set(int value) {
+  value_ = value;
+}
+
+int MetricB::Get() const {
+  return value_;
+}
+
+void MetricB::Reset() {
+  value_ = 0;
+}
\ No newline at end of file
diff --git a/src/complex_test_fixture/metrics/metricB.h b/src/complex_test_fixture/metrics/metricB.h
new file mode 100644
index 0000000..e1ab5d8
--- /dev/null
+++ b/src/complex_test_fixture/metrics/metricB.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include "metric.h"
+
+class MetricB : public Metric {
+ public:
+  explicit MetricB(int value) : value_(value) {};
+  virtual ~MetricB() = default;
+  void Set(int value) override;
+  int Get() const override;
+  void Reset() override;
+
+ private:
+    int value_{0};
+};
\ No newline at end of file
diff --git a/src/complex_test_fixture/publishers/CMakeLists.txt b/src/complex_test_fixture/publishers/CMakeLists.txt
new file mode 100644
index 0000000..3d6e298
--- /dev/null
+++ b/src/complex_test_fixture/publishers/CMakeLists.txt
@@ -0,0 +1,5 @@
+add_library(publishers STATIC PublisherA.cpp PublisherB.cpp)
+
+target_link_libraries(publishers PUBLIC metrics)
+
+target_include_directories(publishers PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
\ No newline at end of file
diff --git a/src/complex_test_fixture/publishers/Publisher.h b/src/complex_test_fixture/publishers/Publisher.h
new file mode 100644
index 0000000..fb3321c
--- /dev/null
+++ b/src/complex_test_fixture/publishers/Publisher.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <string>
+
+
+class Publisher {
+  public:
+    Publisher() = default;
+    virtual ~Publisher() = default;
+
+    virtual void Init() = 0;
+    virtual void Step() = 0;
+};
diff --git a/src/complex_test_fixture/publishers/PublisherA.cpp b/src/complex_test_fixture/publishers/PublisherA.cpp
new file mode 100644
index 0000000..2963b25
--- /dev/null
+++ b/src/complex_test_fixture/publishers/PublisherA.cpp
@@ -0,0 +1,14 @@
+#include "PublisherA.h"
+#include <iostream>
+
+void PublisherA::Init() {
+    std::cout << "PublisherA.Init(" << topic_ << ")" << std::endl;
+}
+
+void PublisherA::Step() {
+    std::cout << "PublisherA.Step(" << topic_ << ")" << std::endl;
+}
+
+void PublisherA::PublishInput(const MetricA& metric, const std::string& message) {
+    std::cout << "PublisherA.PublishInput(" << topic_ << ", " << message << ")" << std::endl;
+}
diff --git a/src/complex_test_fixture/publishers/PublisherA.h b/src/complex_test_fixture/publishers/PublisherA.h
new file mode 100644
index 0000000..d87babd
--- /dev/null
+++ b/src/complex_test_fixture/publishers/PublisherA.h
@@ -0,0 +1,22 @@
+#pragma once
+#include <string>
+#include <utility>
+
+#include "Publisher.h"
+#include "metricA.h"
+
+class PublisherA final : public Publisher {
+public:
+    // Constructor
+    explicit PublisherA(std::string topic) : topic_(std::move(topic)) {}
+
+    void Init() override;
+
+    void Step() override;
+
+    void PublishInput(const MetricA& metric, const std::string& message);
+
+private:
+    // Member variables
+    std::string topic_;
+};
diff --git a/src/complex_test_fixture/publishers/PublisherB.cpp b/src/complex_test_fixture/publishers/PublisherB.cpp
new file mode 100644
index 0000000..90fe20d
--- /dev/null
+++ b/src/complex_test_fixture/publishers/PublisherB.cpp
@@ -0,0 +1,14 @@
+#include "PublisherB.h"
+#include <iostream>
+
+void PublisherB::Init() {
+    std::cout << "PublisherB.init(" << topic_ << ")" << std::endl;
+}
+
+void PublisherB::Step() {
+    std::cout << "PublisherB.step(" << topic_ << ")" << std::endl;
+}
+
+void PublisherB::PublishInput(const MetricB& metric, const std::string& message) {
+    std::cout << "PublisherB.publish(" << topic_ << ", " << message << ")" << std::endl;
+}
diff --git a/src/complex_test_fixture/publishers/PublisherB.h b/src/complex_test_fixture/publishers/PublisherB.h
new file mode 100644
index 0000000..059654e
--- /dev/null
+++ b/src/complex_test_fixture/publishers/PublisherB.h
@@ -0,0 +1,22 @@
+#pragma once
+#include <string>
+#include <utility>
+
+#include "Publisher.h"
+#include "metricB.h"
+
+class PublisherB final : public Publisher {
+public:
+    // Constructor
+    explicit PublisherB(std::string topic) : topic_(std::move(topic)) {}
+
+    void Init() override;
+
+    void Step() override;
+
+    void PublishInput(const MetricB& metric, const std::string& message);
+
+private:
+    // Member variables
+    std::string topic_;
+};
diff --git a/src/complex_test_fixture/subscribers/CMakeLists.txt b/src/complex_test_fixture/subscribers/CMakeLists.txt
new file mode 100644
index 0000000..1089157
--- /dev/null
+++ b/src/complex_test_fixture/subscribers/CMakeLists.txt
@@ -0,0 +1,3 @@
+add_library(subscribers STATIC SubscriberA.cpp)
+
+target_include_directories(subscribers PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
\ No newline at end of file
diff --git a/src/complex_test_fixture/subscribers/Subscriber.h b/src/complex_test_fixture/subscribers/Subscriber.h
new file mode 100644
index 0000000..f9d02cb
--- /dev/null
+++ b/src/complex_test_fixture/subscribers/Subscriber.h
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <string>
+
+class Subscriber {
+public:
+    Subscriber() = default;
+    virtual ~Subscriber() = default;
+
+    virtual void Init() = 0;
+    virtual void Step() = 0;
+    virtual void ReceiveInput(const std::string& message) = 0;
+
+};
\ No newline at end of file
diff --git a/src/complex_test_fixture/subscribers/SubscriberA.cpp b/src/complex_test_fixture/subscribers/SubscriberA.cpp
new file mode 100644
index 0000000..735c12f
--- /dev/null
+++ b/src/complex_test_fixture/subscribers/SubscriberA.cpp
@@ -0,0 +1,15 @@
+#include "SubscriberA.h"
+
+#include <iostream>
+
+void SubscriberA::Init() {
+    std::cout << "SubscriberA.init(" << topic_ << ")" << std::endl;
+}
+
+void SubscriberA::Step() {
+    std::cout << "SubscriberA.step(" << topic_ << ")" << std::endl;
+}
+
+void SubscriberA::ReceiveInput(const std::string& message) {
+    std::cout << "SubscriberA.receive(" << topic_ << ", " << message << ")" << std::endl;
+}
\ No newline at end of file
diff --git a/src/complex_test_fixture/subscribers/SubscriberA.h b/src/complex_test_fixture/subscribers/SubscriberA.h
new file mode 100644
index 0000000..64fd517
--- /dev/null
+++ b/src/complex_test_fixture/subscribers/SubscriberA.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include "Subscriber.h"
+
+class SubscriberA : public Subscriber {
+public:
+    SubscriberA(std::string topic) : topic_(std::move(topic)) {};
+    virtual ~SubscriberA() = default;
+
+    void Init() override;
+
+    void Step() override;
+
+    void ReceiveInput(const std::string& message) override;
+private:
+    std::string topic_;
+};
+
+
+
diff --git a/src/complex_test_fixture/test/CMakeLists.txt b/src/complex_test_fixture/test/CMakeLists.txt
new file mode 100644
index 0000000..cdeb3c0
--- /dev/null
+++ b/src/complex_test_fixture/test/CMakeLists.txt
@@ -0,0 +1,12 @@
+add_executable(child_activity_test ChildActivityTest.cpp ChildActivityFixture.cpp)
+
+# Link libraries
+target_link_libraries(child_activity_test PRIVATE
+    child_activity
+    publishers
+    subscribers
+    GTest::gtest_main
+)
+
+# Add test to CTest
+add_test(NAME ChildActivityTest COMMAND child_activity_test)
diff --git a/src/complex_test_fixture/test/ChildActivityFixture.cpp b/src/complex_test_fixture/test/ChildActivityFixture.cpp
new file mode 100644
index 0000000..645feed
--- /dev/null
+++ b/src/complex_test_fixture/test/ChildActivityFixture.cpp
@@ -0,0 +1,34 @@
+#include "ChildActivityFixture.h"
+
+ChildActivityFixture::ChildActivityFixture() {
+    std::cerr << "ChildActivityFixture constructor" << std::endl;
+    unit_ = std::make_unique<ChildActivity>();
+}
+
+
+void ChildActivityFixture::SetUp() {
+    Init();
+}
+
+void ChildActivityFixture::Init() {
+    publisherA.Init();
+    publisherB.Init();
+    subscriberA.Init();
+    unit_->Init();
+}
+
+void ChildActivityFixture::Step() {
+    publisherA.Step();
+    publisherB.Step();
+    unit_->Step();
+    subscriberA.Step();
+}
+
+void ChildActivityFixture::SetPublisherInputMessages() {
+    publisherA.PublishInput(metricA, "messageA");
+    publisherB.PublishInput(metricB, "messageB");
+}
+
+void ChildActivityFixture::SetSomeFlagEnabled(bool enabled) {
+
+}
diff --git a/src/complex_test_fixture/test/ChildActivityFixture.h b/src/complex_test_fixture/test/ChildActivityFixture.h
new file mode 100644
index 0000000..6228c5e
--- /dev/null
+++ b/src/complex_test_fixture/test/ChildActivityFixture.h
@@ -0,0 +1,40 @@
+#pragma once
+
+#include <gtest/gtest.h>
+
+#include "metricA.h"
+#include "metricB.h"
+
+#include "PublisherA.h"
+#include "PublisherB.h"
+
+#include "SubscriberA.h"
+
+#include "ChildActivity.h"
+
+class ChildActivityFixture : public ::testing::Test {
+public:
+
+    explicit ChildActivityFixture();
+
+    void Init();
+    void Step();
+    void SetPublisherInputMessages();
+
+    void SetSomeFlagEnabled(bool enabled);
+
+     // Members of different publisher types
+    PublisherA publisherA{"topicA"};
+    PublisherB publisherB{"topicB"};
+
+    MetricA metricA{1};
+    MetricB metricB{2};
+
+    SubscriberA subscriberA{"topicA"};
+    
+
+    std::unique_ptr<ChildActivity> unit_{nullptr};
+
+protected:
+    void SetUp() override;
+};
\ No newline at end of file
diff --git a/src/complex_test_fixture/test/ChildActivityTest.cpp b/src/complex_test_fixture/test/ChildActivityTest.cpp
new file mode 100644
index 0000000..f7fb73e
--- /dev/null
+++ b/src/complex_test_fixture/test/ChildActivityTest.cpp
@@ -0,0 +1,27 @@
+#include "ChildActivityFixture.h"
+
+class ChildActivityTest : public ChildActivityFixture {
+protected:
+  void SetUp() override {
+    ChildActivityFixture::SetUp();
+  }
+
+  void CheckResults(int value) {
+    EXPECT_EQ(metricA.Get(), value);
+  }
+};
+
+TEST_F(ChildActivityTest, Test1) {
+    metricA.Set(1);
+    SetPublisherInputMessages();
+    Step();
+    CheckResults(1);
+}
+
+TEST_F(ChildActivityTest, Test2) {
+    metricA.Set(2);
+    metricA.Reset();
+    SetPublisherInputMessages();
+    Step();
+    CheckResults(0);
+}
\ No newline at end of file
diff --git a/src/cpp-inheritance/CMakeLists.txt b/src/cpp-inheritance/CMakeLists.txt
new file mode 100644
index 0000000..5b7e0c6
--- /dev/null
+++ b/src/cpp-inheritance/CMakeLists.txt
@@ -0,0 +1,6 @@
+add_subdirectory(base)
+add_subdirectory(child)
+
+add_executable(inheritance main.cpp)
+
+target_link_libraries(inheritance upper_case_processor)
\ No newline at end of file
diff --git a/src/cpp-inheritance/base/CMakeLists.txt b/src/cpp-inheritance/base/CMakeLists.txt
new file mode 100644
index 0000000..6a0a361
--- /dev/null
+++ b/src/cpp-inheritance/base/CMakeLists.txt
@@ -0,0 +1,3 @@
+add_library(data_processor STATIC data_processor.cpp)
+
+target_include_directories(data_processor PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
\ No newline at end of file
diff --git a/src/cpp-inheritance/base/data_processor.cpp b/src/cpp-inheritance/base/data_processor.cpp
new file mode 100644
index 0000000..af4ea4c
--- /dev/null
+++ b/src/cpp-inheritance/base/data_processor.cpp
@@ -0,0 +1,22 @@
+#include "data_processor.h"
+
+void DataProcessor::process(const std::vector<std::string>& data) {
+    // Processed data storage
+    std::vector<std::string> processedData;
+
+    // Process each item using the virtual method
+    for (const auto& item : data) {
+        std::string result = processData(item);
+        processedData.push_back(result);
+    }
+
+    // Output the results
+    for (const auto& item : processedData) {
+        std::cout << item << std::endl;
+    }
+}
+
+std::string DataProcessor::processData(const std::string& input) {
+    // Default implementation (could be empty or provide basic processing)
+    return input;
+}
diff --git a/src/cpp-inheritance/base/data_processor.h b/src/cpp-inheritance/base/data_processor.h
new file mode 100644
index 0000000..f796bda
--- /dev/null
+++ b/src/cpp-inheritance/base/data_processor.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <vector>
+#include <string>
+#include <iostream>
+
+class DataProcessor {
+public:
+    void process(const std::vector<std::string>& data);
+
+protected:
+    virtual std::string processData(const std::string& input);
+};
diff --git a/src/cpp-inheritance/child/CMakeLists.txt b/src/cpp-inheritance/child/CMakeLists.txt
new file mode 100644
index 0000000..585515c
--- /dev/null
+++ b/src/cpp-inheritance/child/CMakeLists.txt
@@ -0,0 +1,5 @@
+add_library(upper_case_processor STATIC upper_case_processor.cpp)
+
+target_include_directories(upper_case_processor PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+
+target_link_libraries(upper_case_processor data_processor)
\ No newline at end of file
diff --git a/src/cpp-inheritance/child/upper_case_processor.cpp b/src/cpp-inheritance/child/upper_case_processor.cpp
new file mode 100644
index 0000000..020e1a9
--- /dev/null
+++ b/src/cpp-inheritance/child/upper_case_processor.cpp
@@ -0,0 +1,7 @@
+#include "upper_case_processor.h"
+
+std::string UpperCaseProcessor::processData(const std::string& input) {
+    std::string output = input;
+    std::transform(output.begin(), output.end(), output.begin(), ::toupper);
+    return output;
+}
\ No newline at end of file
diff --git a/src/cpp-inheritance/child/upper_case_processor.h b/src/cpp-inheritance/child/upper_case_processor.h
new file mode 100644
index 0000000..ce10d46
--- /dev/null
+++ b/src/cpp-inheritance/child/upper_case_processor.h
@@ -0,0 +1,9 @@
+#pragma once
+
+#include "data_processor.h"
+#include <algorithm>
+
+class UpperCaseProcessor : public DataProcessor {
+protected:
+    std::string processData(const std::string& input) override;
+};
diff --git a/src/cpp-inheritance/main.cpp b/src/cpp-inheritance/main.cpp
new file mode 100644
index 0000000..2f42241
--- /dev/null
+++ b/src/cpp-inheritance/main.cpp
@@ -0,0 +1,12 @@
+#include "upper_case_processor.h"
+#include <vector>
+#include <string>
+
+int main() {
+    std::vector<std::string> data = {"Hello", "World", "Data Processing"};
+
+    UpperCaseProcessor processor;
+    processor.process(data);
+
+    return 0;
+}