diff --git a/test/unit_test/static/quantity_test.cpp b/test/unit_test/static/quantity_test.cpp
index 164bf533..db046b65 100644
--- a/test/unit_test/static/quantity_test.cpp
+++ b/test/unit_test/static/quantity_test.cpp
@@ -304,6 +304,8 @@ concept invalid_dimensionless_operation = requires()
 };
 static_assert(invalid_dimensionless_operation<int>);
 
+static_assert(std::is_same_v<decltype(10q_km / 5q_km), quantity<dim_one, unitless, std::int64_t>>);
+
 static_assert(quantity_cast<percent>(50.q_m / 100.q_m).count() == 50);
 static_assert(50.q_m / 100.q_m == dimensionless<percent>(50));
 
diff --git a/test/unit_test/static/si_test.cpp b/test/unit_test/static/si_test.cpp
index ae4a00e3..16e9196c 100644
--- a/test/unit_test/static/si_test.cpp
+++ b/test/unit_test/static/si_test.cpp
@@ -104,6 +104,7 @@ static_assert(120 / 1q_min == 2q_Hz);
 static_assert(1000 / 1q_s == 1q_kHz);
 static_assert(1 / 1q_ms == 1q_kHz);
 static_assert(3.2q_GHz == 3'200'000'000q_Hz);
+static_assert((10q_Hz * 1q_min).count() == 10);
 static_assert(10q_Hz * 1q_min == dimensionless<scaled_unit<ratio(60), unitless>>(10));
 static_assert(10q_Hz * 1q_min == dimensionless<unitless>(600));
 static_assert(2 / 1q_Hz == 2q_s);