diff --git a/include/sta/tasty/config.hpp b/include/sta/tasty/config.hpp
index 9baa6f7..3561410 100644
--- a/include/sta/tasty/config.hpp
+++ b/include/sta/tasty/config.hpp
@@ -2,6 +2,6 @@
 #ifndef STA_TASTY_CONFIG_HPP
 #define STA_TASTY_CONFIG_HPP
 
-#define TASTY_CASE_9
+#define TASTY_CASE_12
 
 #endif // STA_TASTY_CONFIG_HPP  
diff --git a/src/cases/case12.cpp b/src/cases/case12.cpp
new file mode 100644
index 0000000..9607305
--- /dev/null
+++ b/src/cases/case12.cpp
@@ -0,0 +1,123 @@
+/**
+ * @file case12.cpp
+ * @author Dario van den Boom
+ * @brief 
+ * @version 0.1
+ * @date 2024-04-18
+ * 
+ * @copyright Copyright (c) 2024
+ * 
+ */
+
+/**
+ * Tests if the barrier is working correctly.
+ */
+#include <sta/tasty/config.hpp>
+#ifdef TASTY_CASE_12
+
+#include <sta/tacos.hpp>
+#include <sta/tasty/utils.hpp>
+
+#include <sta/rtos/patterns/barrier.hpp>
+#include <sta/time.hpp>
+
+
+namespace sta
+{
+    namespace tasty
+    {
+        Barrier * barrier;
+
+        class BarrierThread : public tacos::TacosThread
+        {
+        public:
+            BarrierThread(const char * name, uint32_t duration, osPriority_t priority = osPriorityNormal)
+                : tacos::TacosThread{name, priority, 512},
+                  duration_{duration}
+            {
+                STA_ASSERT(name != nullptr);
+            }
+
+            void init() override
+            {
+                barrier->subscribe();
+            }
+
+            void func() override
+            {
+                sleep(duration_);
+
+                barrier->wait();
+            }
+        private:
+            uint32_t duration_;
+        };
+
+    	class Observer : public tacos::TacosThread
+		{
+		public:
+			Observer()
+				: tacos::TacosThread{"Observer", osPriorityAboveNormal}
+			{
+
+			}
+
+			void func() override
+			{
+                sleep(10);
+				STA_TASTY_ASSERT(barrier->getNumSubscribedThreads() == 4);
+                STA_TASTY_ASSERT(barrier->getNumEntered() == 0);
+                STA_TASTY_ASSERT(barrier->getNumLeft() == 4);
+
+                // Wait until B and D enter the barrier.
+                sleep(11);
+                STA_TASTY_ASSERT(barrier->getNumEntered() == 2);
+                STA_TASTY_ASSERT(barrier->getNumLeft() == 0);
+
+                sleep(50);
+                STA_TASTY_ASSERT(barrier->getNumEntered() == 3);
+                STA_TASTY_ASSERT(barrier->getNumLeft() == 0);
+
+                uint32_t before = now();
+                barrier->externalWait();
+                uint32_t after = now();
+
+                // The time until A reached the barrier and opened it should have been less than 40 ticks.
+                STA_TASTY_ASSERT(after - before < 40);
+                STA_TASTY_ASSERT(barrier->getNumLeft() == 0);
+                STA_TASTY_ASSERT(barrier->getNumEntered() == 4);
+
+                // Force the barrier to stay closed for at least 200 ticks.
+                barrier->setMinimumWaitDuration(200);
+
+                sleep(5);
+                STA_TASTY_ASSERT(barrier->getNumLeft() == 4);
+                STA_TASTY_ASSERT(barrier->getNumEntered() == 0);
+
+                sleep(150);
+                STA_TASTY_ASSERT(barrier->getNumLeft() == 4);
+                STA_TASTY_ASSERT(barrier->getNumEntered() == 4);
+
+                sleep(55);
+                STA_TASTY_ASSERT(barrier->getNumLeft() == 4);
+                STA_TASTY_ASSERT(barrier->getNumEntered() == 0);
+
+				STA_TASTY_TERMINATE();
+			}
+		};
+
+        void onTastyInit()
+        {
+            barrier = new Barrier("Test Barrier");
+
+            tacos::addThread<BarrierThread>(ALL_STATES, "A", 100);
+            tacos::addThread<BarrierThread>(ALL_STATES, "B", 10);
+            tacos::addThread<BarrierThread>(ALL_STATES, "C", 50);
+            tacos::addThread<BarrierThread>(ALL_STATES, "D", 10);
+
+            tacos::addThread<Observer>(ALL_STATES);            
+        }
+    } // namespace tasty
+}
+
+#endif // TASTY_CASE_12
diff --git a/src/startup.cpp b/src/startup.cpp
index 5452f27..38edcf0 100644
--- a/src/startup.cpp
+++ b/src/startup.cpp
@@ -10,6 +10,10 @@
 #include <sta/debug/debug.hpp>
 #include <sta/tasty/utils.hpp>
 
+#include <FreeRTOS.h>
+#include <task.h>
+
+
 namespace sta
 {
 	namespace tasty
@@ -30,3 +34,9 @@ namespace sta
 	} // namespace tacos
 } // namespace sta
 
+
+void vApplicationStackOverflowHook(xTaskHandle xTask, signed char *pcTaskName)
+{
+	// Dummy assert to signal test failure due to stack overflow.
+   	STA_TASTY_ASSERT(false);
+}