diff --git a/test_pipelineTracker.cpp b/test_pipelineTracker.cpp
new file mode 100644
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--- /dev/null
+++ b/test_pipelineTracker.cpp
@@ -0,0 +1,164 @@
+/*
+ * Copyright (c) 2026 Mykhailo Mamedov. All rights reserved.
+ *
+ * RESEARCH PREVIEW / REFERENCE ONLY:
+ * This source code is provided solely for the purpose of reviewing
+ * the author's research methods and implementation.
+ *
+ * NO LICENSE GRANTED:
+ * This code is NOT for distribution, modification, or use in any
+ * project (commercial or otherwise). Unauthorized copying or
+ * use of this code is strictly prohibited.
+ *
+ * For inquiries regarding use or licensing, contact: ua.modin@gmail.com
+ * 
+ * Minimal test.
+ * 
+ */
+
+#include "pch.h"
+#include "common.h"
+#include "pipelineTracker.hpp"
+
+using namespace M_CORE;
+
+// Fake hardware state registries
+static std::unordered_map<VkSemaphore, uint64_t> g_mockSems;
+static uint64_t g_nextMockHandle = 0x1000;
+
+// --- VULKAN OVERRIDES VIA HOOKING
+extern "C" {
+    VkResult vkGetSemaphoreCounterValue(VkDevice device, VkSemaphore semaphore, uint64_t* pValue) {
+        if (pValue && g_mockSems.count(semaphore)) {
+            *pValue = g_mockSems[semaphore];
+        }
+        else if (pValue) {
+            *pValue = 0; // Default fallback
+        }
+        return VK_SUCCESS;
+    }
+
+    VkResult vkSignalSemaphore(VkDevice device, const VkSemaphoreSignalInfo* pSignalInfo) {
+        if (pSignalInfo && pSignalInfo->semaphore) {
+            g_mockSems[pSignalInfo->semaphore] = pSignalInfo->value;
+        }
+        return VK_SUCCESS;
+    }
+
+    VkResult vkCreateSemaphore(VkDevice device, const VkSemaphoreCreateInfo* pCreateInfo, 
+        const VkAllocationCallbacks* pAllocator, VkSemaphore* pSemaphore) {
+            if (!pSemaphore) return VK_ERROR_INITIALIZATION_FAILED;
+
+            // Generate a fake handle.
+            g_nextMockHandle += 8;
+            VkSemaphore fakeHandle = reinterpret_cast<VkSemaphore>(g_nextMockHandle);
+
+            // Parse the initial value.
+            uint64_t initialValue = 0;
+            if (pCreateInfo && pCreateInfo->pNext) {
+                auto* typeInfo = reinterpret_cast<const VkSemaphoreTypeCreateInfo*>(pCreateInfo->pNext);
+                if (typeInfo->sType == VK_STRUCTURE_TYPE_SEMAPHORE_TYPE_CREATE_INFO) {
+                    initialValue = typeInfo->initialValue;
+                }
+            }
+
+            // Register into map.
+            g_mockSems[fakeHandle] = initialValue;
+
+            *pSemaphore = fakeHandle;
+            return VK_SUCCESS;
+    }
+
+    void vkDestroySemaphore(
+        VkDevice device,
+        VkSemaphore semaphore,
+        const VkAllocationCallbacks* pAllocator) {}
+
+    VkResult vkCreateQueryPool(VkDevice device, const VkQueryPoolCreateInfo* pCreateInfo,
+        const VkAllocationCallbacks* pAllocator, VkQueryPool* pQueryPool) {
+            *pQueryPool = (VkQueryPool)0x00123;
+            return VK_SUCCESS;
+    }
+}
+
+class PipelineTrackerTestFixture : public ::testing::Test {
+protected:
+    VulkanPipelineTracker* tracker = nullptr;
+    mCore m_vkCore;
+    mDevice devA;
+    mDevice devB;
+
+    void SetUp() override {
+        g_mockSems.clear();
+        devA.virtualDevice = (VkDevice)0x1;
+        devB.virtualDevice = (VkDevice)0x2;
+        std::vector<StageConfig> stageMapping = {
+            {&devA, nullptr,    "Stage0"},
+            {&devA, &devB ,     "Stage1"},
+            {&devB, &devA,      "Stage2"},
+            {&devB, nullptr,    "Stage3"}
+        };
+        tracker = new VulkanPipelineTracker(&m_vkCore, stageMapping);
+    }
+
+    void TearDown() override {
+        delete tracker;
+        g_mockSems.clear();
+    }
+};
+
+/**
+ * @brief Verifies stage completion status and sem evaluations.
+ *          Validates that the tracking matrix accurately catches matching,
+ *          mismatched, or uninitialized host counters against mock
+ *          GPU exec timeline registers before flagging readiness.
+ */
+TEST_F(PipelineTrackerTestFixture, VerifyStageCompletion) {
+    u32 stageId = 0;
+    u32 consumerStageId = 1;
+    u64 latestStageSignaled = 0;
+    EXPECT_TRUE(tracker->IsStageComplete(stageId, latestStageSignaled));
+
+    StageContext* context0 = tracker->GetStageContext(stageId);
+    context0->m_gpuExecutionCounter = 1;
+    g_mockSems[context0->localTimelineSem.semaphore] = 1;
+    EXPECT_TRUE(tracker->IsStageComplete(stageId, latestStageSignaled));
+
+    context0->m_gpuExecutionCounter = 2;
+    EXPECT_FALSE(tracker->IsStageComplete(stageId, latestStageSignaled));
+
+    EXPECT_TRUE(tracker->IsIndexSafeToWrite(consumerStageId, 0));
+    u64 targetLocalTimelineValue = 0;
+    sem* localSemaphore = nullptr;
+    tracker->AdvanceStageSync(stageId, targetLocalTimelineValue, localSemaphore, 0);
+    EXPECT_EQ(targetLocalTimelineValue, 3);
+
+    EXPECT_EQ(tracker->GetStageDevice(stageId), devA.virtualDevice);
+
+    u64 latestProducerFrame = 0;
+    EXPECT_EQ(tracker->getSafeIndex(stageId, latestProducerFrame), 1);
+    EXPECT_EQ(latestProducerFrame, 1);
+ 
+}
+
+/**
+ * @brief Verifies cross-device value replication.
+ *          Validates that a multi-value producer jump forces the CPU
+ *          mirroring loop to step the consumer timeline forward strictly
+ *          by exactly +1 per call/frame without skipping.
+ */
+TEST_F(PipelineTrackerTestFixture, VerifySignalMirroring) {    
+    u32 consumerStageId = 1;
+    StageContext* context1 = tracker->GetStageContext(consumerStageId);
+    g_mockSems[context1->localTimelineSem.semaphore] = 3;
+    tracker->MirrorSignals();
+    tracker->MirrorSignals();
+    tracker->MirrorSignals();
+    EXPECT_EQ(g_mockSems[context1->localTimelineSem.semaphoreRemote], 3);
+}
+
+int main(int argc, char** argv) {
+    testing::InitGoogleTest(&argc, argv);
+    assert(putenv(cfgTest::envSetting) == 0);
+    return RUN_ALL_TESTS();
+}