diff --git a/services/inputflinger/tests/CursorInputMapper_test.cpp b/services/inputflinger/tests/CursorInputMapper_test.cpp
index 18e0b30..594ee3b 100644
--- a/services/inputflinger/tests/CursorInputMapper_test.cpp
+++ b/services/inputflinger/tests/CursorInputMapper_test.cpp
@@ -141,9 +141,9 @@
  */
 class CursorInputMapperUnitTestBase : public InputMapperUnitTest {
 protected:
-    void SetUp() override { SetUpWithBus(BUS_USB); }
-    void SetUpWithBus(int bus) override {
-        InputMapperUnitTest::SetUpWithBus(bus);
+    void SetUp() override { SetUp(BUS_USB, /*isExternal=*/false); }
+    void SetUp(int bus, bool isExternal) override {
+        InputMapperUnitTest::SetUp(bus, isExternal);
 
         // Current scan code state - all keys are UP by default
         setScanCodeState(KeyState::UP,
@@ -1142,7 +1142,9 @@
 
 class BluetoothCursorInputMapperUnitTest : public CursorInputMapperUnitTestBase {
 protected:
-    void SetUp() override { SetUpWithBus(BUS_BLUETOOTH); }
+    void SetUp() override {
+        CursorInputMapperUnitTestBase::SetUp(BUS_BLUETOOTH, /*isExternal=*/true);
+    }
 };
 
 TEST_F(BluetoothCursorInputMapperUnitTest, TimestampSmoothening) {
diff --git a/services/inputflinger/tests/InputMapperTest.cpp b/services/inputflinger/tests/InputMapperTest.cpp
index 8235c90..77f42f2 100644
--- a/services/inputflinger/tests/InputMapperTest.cpp
+++ b/services/inputflinger/tests/InputMapperTest.cpp
@@ -30,7 +30,7 @@
 using testing::Return;
 using testing::ReturnRef;
 
-void InputMapperUnitTest::SetUpWithBus(int bus) {
+void InputMapperUnitTest::SetUp(int bus, bool isExternal) {
     mFakePolicy = sp<FakeInputReaderPolicy>::make();
 
     EXPECT_CALL(mMockInputReaderContext, getPolicy()).WillRepeatedly(Return(mFakePolicy.get()));
@@ -46,8 +46,9 @@
         return mPropertyMap;
     });
 
-    mDevice = std::make_unique<NiceMock<MockInputDevice>>(&mMockInputReaderContext, DEVICE_ID,
-                                                          /*generation=*/2, mIdentifier);
+    mDevice =
+            std::make_unique<NiceMock<MockInputDevice>>(&mMockInputReaderContext, DEVICE_ID,
+                                                        /*generation=*/2, mIdentifier, isExternal);
     ON_CALL((*mDevice), getConfiguration).WillByDefault(ReturnRef(mPropertyMap));
     mDeviceContext = std::make_unique<InputDeviceContext>(*mDevice, EVENTHUB_ID);
 }
diff --git a/services/inputflinger/tests/InputMapperTest.h b/services/inputflinger/tests/InputMapperTest.h
index 10ef6f1..edc87a3 100644
--- a/services/inputflinger/tests/InputMapperTest.h
+++ b/services/inputflinger/tests/InputMapperTest.h
@@ -40,8 +40,8 @@
 protected:
     static constexpr int32_t EVENTHUB_ID = 1;
     static constexpr int32_t DEVICE_ID = END_RESERVED_ID + 1000;
-    virtual void SetUp() override { SetUpWithBus(0); }
-    virtual void SetUpWithBus(int bus);
+    virtual void SetUp() override { SetUp(/*bus=*/0, /*isExternal=*/false); }
+    virtual void SetUp(int bus, bool isExternal);
 
     void setupAxis(int axis, bool valid, int32_t min, int32_t max, int32_t resolution,
                    int32_t flat = 0, int32_t fuzz = 0);
diff --git a/services/inputflinger/tests/InterfaceMocks.h b/services/inputflinger/tests/InterfaceMocks.h
index 5910238..dce5472 100644
--- a/services/inputflinger/tests/InterfaceMocks.h
+++ b/services/inputflinger/tests/InterfaceMocks.h
@@ -196,14 +196,14 @@
 class MockInputDevice : public InputDevice {
 public:
     MockInputDevice(InputReaderContext* context, int32_t id, int32_t generation,
-                    const InputDeviceIdentifier& identifier)
-          : InputDevice(context, id, generation, identifier) {}
+                    const InputDeviceIdentifier& identifier, bool isExternal)
+          : InputDevice(context, id, generation, identifier), mIsExternal(isExternal) {}
 
     MOCK_METHOD(uint32_t, getSources, (), (const, override));
     MOCK_METHOD(std::optional<DisplayViewport>, getAssociatedViewport, (), (const));
     MOCK_METHOD(KeyboardType, getKeyboardType, (), (const, override));
     MOCK_METHOD(bool, isEnabled, (), ());
-    MOCK_METHOD(bool, isExternal, (), (override));
+    bool isExternal() override { return mIsExternal; }
 
     MOCK_METHOD(void, dump, (std::string& dump, const std::string& eventHubDevStr), ());
     MOCK_METHOD(void, addEmptyEventHubDevice, (int32_t eventHubId), ());
@@ -266,5 +266,6 @@
 
 private:
     int32_t mGeneration = 0;
+    const bool mIsExternal;
 };
 } // namespace android
diff --git a/services/inputflinger/tests/KeyboardInputMapper_test.cpp b/services/inputflinger/tests/KeyboardInputMapper_test.cpp
index 1dd32c4..17acdd4 100644
--- a/services/inputflinger/tests/KeyboardInputMapper_test.cpp
+++ b/services/inputflinger/tests/KeyboardInputMapper_test.cpp
@@ -1085,10 +1085,9 @@
 class KeyboardInputMapperTest_ExternalAlphabeticDevice : public KeyboardInputMapperUnitTest {
 protected:
     void SetUp() override {
-        InputMapperUnitTest::SetUp();
+        InputMapperUnitTest::SetUp(/*bus=*/0, /*isExternal=*/true);
         ON_CALL((*mDevice), getSources).WillByDefault(Return(AINPUT_SOURCE_KEYBOARD));
         ON_CALL((*mDevice), getKeyboardType).WillByDefault(Return(KeyboardType::ALPHABETIC));
-        ON_CALL((*mDevice), isExternal).WillByDefault(Return(true));
         EXPECT_CALL(mMockEventHub, getDeviceClasses(EVENTHUB_ID))
                 .WillRepeatedly(Return(InputDeviceClass::KEYBOARD | InputDeviceClass::ALPHAKEY |
                                        InputDeviceClass::EXTERNAL));
@@ -1102,10 +1101,9 @@
 class KeyboardInputMapperTest_ExternalNonAlphabeticDevice : public KeyboardInputMapperUnitTest {
 protected:
     void SetUp() override {
-        InputMapperUnitTest::SetUp();
+        InputMapperUnitTest::SetUp(/*bus=*/0, /*isExternal=*/true);
         ON_CALL((*mDevice), getSources).WillByDefault(Return(AINPUT_SOURCE_KEYBOARD));
         ON_CALL((*mDevice), getKeyboardType).WillByDefault(Return(KeyboardType::NON_ALPHABETIC));
-        ON_CALL((*mDevice), isExternal).WillByDefault(Return(true));
         EXPECT_CALL(mMockEventHub, getDeviceClasses(EVENTHUB_ID))
                 .WillRepeatedly(Return(InputDeviceClass::KEYBOARD | InputDeviceClass::EXTERNAL));
         mMapper = createInputMapper<KeyboardInputMapper>(*mDeviceContext, mReaderConfiguration,
diff --git a/services/inputflinger/tests/MultiTouchInputMapper_test.cpp b/services/inputflinger/tests/MultiTouchInputMapper_test.cpp
index d15048d..0ea22d4 100644
--- a/services/inputflinger/tests/MultiTouchInputMapper_test.cpp
+++ b/services/inputflinger/tests/MultiTouchInputMapper_test.cpp
@@ -53,8 +53,9 @@
  */
 class MultiTouchInputMapperUnitTest : public InputMapperUnitTest {
 protected:
-    void SetUp() override {
-        InputMapperUnitTest::SetUp();
+    void SetUp() override { SetUp(/*bus=*/0, /*isExternal=*/false); }
+    void SetUp(int bus, bool isExternal) override {
+        InputMapperUnitTest::SetUp(bus, isExternal);
 
         // Present scan codes
         expectScanCodes(/*present=*/true,
diff --git a/services/inputflinger/tests/RotaryEncoderInputMapper_test.cpp b/services/inputflinger/tests/RotaryEncoderInputMapper_test.cpp
index 157bee3..548df22 100644
--- a/services/inputflinger/tests/RotaryEncoderInputMapper_test.cpp
+++ b/services/inputflinger/tests/RotaryEncoderInputMapper_test.cpp
@@ -89,9 +89,9 @@
  */
 class RotaryEncoderInputMapperTest : public InputMapperUnitTest {
 protected:
-    void SetUp() override { SetUpWithBus(BUS_USB); }
-    void SetUpWithBus(int bus) override {
-        InputMapperUnitTest::SetUpWithBus(bus);
+    void SetUp() override { SetUp(/*bus=*/0, /*isExternal=*/false); }
+    void SetUp(int bus, bool isExternal) override {
+        InputMapperUnitTest::SetUp(bus, isExternal);
 
         EXPECT_CALL(mMockEventHub, hasRelativeAxis(EVENTHUB_ID, REL_WHEEL))
                 .WillRepeatedly(Return(true));