diff --git a/unit_tests/tests/tests.mk b/unit_tests/tests/tests.mk
index a869c13903..cb32a93306 100644
--- a/unit_tests/tests/tests.mk
+++ b/unit_tests/tests/tests.mk
@@ -9,6 +9,7 @@ TESTS_SRC_CPP = \
 	tests/trigger/test_real_cranking_miata_NA.cpp \
 	tests/trigger/test_real_cranking_miata_na6.cpp \
 	tests/trigger/test_real_volkswagen.cpp \
+	tests/trigger/test_rpm_multiplier.cpp \
 	tests/trigger/test_quad_cam.cpp \
 	tests/trigger/test_override_gaps.cpp \
 	tests/trigger/test_injection_scheduling.cpp \
diff --git a/unit_tests/tests/trigger/test_rpm_multiplier.cpp b/unit_tests/tests/trigger/test_rpm_multiplier.cpp
new file mode 100644
index 0000000000..817a030625
--- /dev/null
+++ b/unit_tests/tests/trigger/test_rpm_multiplier.cpp
@@ -0,0 +1,41 @@
+/*
+ * @file test_rpm_multiplier.cpp
+ *
+ * Four different cases of operation_mode_e and getRpmMultiplier
+ *
+ * @date Jun 26, 2021
+ * @author Andrey Belomutskiy, (c) 2012-2021
+ */
+
+#include "engine_test_helper.h"
+
+static void runRpmTest(operation_mode_e mode, int expected) {
+	WITH_ENGINE_TEST_HELPER(TEST_ENGINE);
+	engineConfiguration->ambiguousOperationMode = mode;
+	eth.setTriggerType(TT_ONE PASS_ENGINE_PARAMETER_SUFFIX);
+
+	eth.smartFireTriggerEvents2(/*count*/200, /*delay*/ 40);
+	ASSERT_EQ(expected, GET_RPM());
+}
+
+// todo: google test profiles one day?
+
+TEST(engine, testRpmOfCamSensor) {
+	runRpmTest(FOUR_STROKE_CAM_SENSOR, 1500);
+}
+
+TEST(engine, testRpmOfSymmetricalCrank) {
+	runRpmTest(FOUR_STROKE_SYMMETRICAL_CRANK_SENSOR, 375);
+}
+
+TEST(engine, testRpmOfTwoStroke) {
+	runRpmTest(TWO_STROKE, 750);
+}
+
+TEST(engine, testRpmOfCrankOnly) {
+	runRpmTest(FOUR_STROKE_CRANK_SENSOR, 750);
+}
+
+TEST(engine, testRpmOfThreeTimesCrank) {
+	runRpmTest(FOUR_STROKE_THREE_TIMES_CRANK_SENSOR, 375);
+}