diff --git a/firmware/development/engine_sniffer.cpp b/firmware/development/engine_sniffer.cpp
index 191ae08dc3..1c18e5290d 100644
--- a/firmware/development/engine_sniffer.cpp
+++ b/firmware/development/engine_sniffer.cpp
@@ -115,6 +115,10 @@ bool WaveChart::isFull() const {
 	return counter >= CONFIG(engineChartSize);
 }
 
+int WaveChart::getSize() {
+	return counter;
+}
+
 #if ! EFI_UNIT_TEST
 static void printStatus(void) {
 	scheduleMsg(&logger, "engine chart: %s", boolToString(engineConfiguration->isEngineChartEnabled));
diff --git a/firmware/development/engine_sniffer.h b/firmware/development/engine_sniffer.h
index 17e8cfd6c2..ad1deea51b 100644
--- a/firmware/development/engine_sniffer.h
+++ b/firmware/development/engine_sniffer.h
@@ -31,6 +31,7 @@ public:
 	bool isStartedTooLongAgo() const;
 	// looks like this is only used by functional tests on real hardware
 	efitick_t pauseEngineSnifferUntilNt = 0;
+	int getSize();
 
 private:
 	Logging logging;
diff --git a/unit_tests/tests/trigger/test_cam_vvt_input.cpp b/unit_tests/tests/trigger/test_cam_vvt_input.cpp
index 6b1b8c34e6..2a5e8347cf 100644
--- a/unit_tests/tests/trigger/test_cam_vvt_input.cpp
+++ b/unit_tests/tests/trigger/test_cam_vvt_input.cpp
@@ -8,6 +8,9 @@
 #include "engine_test_helper.h"
 extern WarningCodeState unitTestWarningCodeState;
 
+#include "engine_sniffer.h"
+extern WaveChart waveChart;
+
 TEST(trigger, testNoStartUpWarningsNoSyncronizationTrigger) {
 	WITH_ENGINE_TEST_HELPER(TEST_ENGINE);
 	// one tooth does not need synchronization it just counts tooth
@@ -163,4 +166,6 @@ TEST(sensors, testNB2CamInput) {
 	ASSERT_NEAR(-67.6 - 720 - 720, engine->triggerCentral.getVVTPosition(0, 0), EPS3D);
 	// actually position based on VVT!
 	ASSERT_EQ(totalRevolutionCountBeforeVvtSync + 2, engine->triggerCentral.triggerState.getTotalRevolutionCounter());
+
+	ASSERT_EQ(28, waveChart.getSize());
 }