diff --git a/test/dbus_util_unittest.cpp b/test/dbus_util_unittest.cpp
index 4896e03..09d1b5c 100644
--- a/test/dbus_util_unittest.cpp
+++ b/test/dbus_util_unittest.cpp
@@ -40,7 +40,11 @@
         std::make_tuple("margin", "9",
                         "/xyz/openbmc_project/sensors/temperature/9"),
         std::make_tuple("temp", "123",
-                        "/xyz/openbmc_project/sensors/temperature/123")));
+                        "/xyz/openbmc_project/sensors/temperature/123"),
+        std::make_tuple("power", "9000",
+                        "/xyz/openbmc_project/sensors/power/9000"),
+        std::make_tuple("powersum", "total",
+                        "/xyz/openbmc_project/sensors/power/total")));
 
 class FindSensorsTest : public ::testing::Test
 {
diff --git a/test/pid_thermalcontroller_unittest.cpp b/test/pid_thermalcontroller_unittest.cpp
index 4e71a3b..ab45661 100644
--- a/test/pid_thermalcontroller_unittest.cpp
+++ b/test/pid_thermalcontroller_unittest.cpp
@@ -152,6 +152,27 @@
     EXPECT_EQ(5.0, p->inputProc());
 }
 
+TEST(ThermalControllerTest, InputProc_MultipleInputsSummation)
+{
+    // This test verifies inputProc behaves as expected with multiple summation
+    // inputs.
+
+    ZoneMock z;
+
+    std::vector<std::string> inputs = {"fleeting0", "fleeting1"};
+    double setpoint = 10.0;
+    ec::pidinfo initial;
+
+    std::unique_ptr<PIDController> p = ThermalController::createThermalPid(
+        &z, "therm1", inputs, setpoint, initial, ThermalType::summation);
+    EXPECT_FALSE(p == nullptr);
+
+    EXPECT_CALL(z, getCachedValue(StrEq("fleeting0"))).WillOnce(Return(5.0));
+    EXPECT_CALL(z, getCachedValue(StrEq("fleeting1"))).WillOnce(Return(10.0));
+
+    EXPECT_EQ(15.0, p->inputProc());
+}
+
 TEST(ThermalControllerTest, NegHysteresis_BehavesAsExpected)
 {