diff --git a/app/src/main/java/com/placeholder/ringhealth/feature/device/DeviceScreen.kt b/app/src/main/java/com/placeholder/ringhealth/feature/device/DeviceScreen.kt
index 6dbb58d..9be0a7d 100644
--- a/app/src/main/java/com/placeholder/ringhealth/feature/device/DeviceScreen.kt
+++ b/app/src/main/java/com/placeholder/ringhealth/feature/device/DeviceScreen.kt
@@ -126,7 +126,7 @@ private fun DeviceInfoCard(state: DeviceUiState, modifier: Modifier = Modifier)
 
 /** 单行设置项（只读展示，开关在详情页操作）。 */
 @Composable
-internal fun SettingRow(setting: DeviceFunctionSetting, modifier: Modifier = Modifier) {
+private fun SettingRow(setting: DeviceFunctionSetting, modifier: Modifier = Modifier) {
     HealthCard(modifier = modifier) {
         Row(
             modifier = Modifier.fillMaxWidth(),
diff --git a/app/src/test/java/com/placeholder/ringhealth/feature/device/DeviceViewModelTest.kt b/app/src/test/java/com/placeholder/ringhealth/feature/device/DeviceViewModelTest.kt
index 2a60c78..e83ef18 100644
--- a/app/src/test/java/com/placeholder/ringhealth/feature/device/DeviceViewModelTest.kt
+++ b/app/src/test/java/com/placeholder/ringhealth/feature/device/DeviceViewModelTest.kt
@@ -33,8 +33,9 @@ class DeviceViewModelTest {
     }
 
     @Test
-    fun `输出设备状态与五个功能开关`() = runTest(dispatcher) {
-        val viewModel = DeviceViewModel(MockRingDeviceRepository())
+    fun `输出设备状态与五个功能开关，且仓库变化会回流到 UI 状态`() = runTest(dispatcher) {
+        val repository = MockRingDeviceRepository()
+        val viewModel = DeviceViewModel(repository)
         backgroundScope.launch { viewModel.uiState.collect {} }
 
         advanceUntilIdle()
@@ -43,6 +44,14 @@ class DeviceViewModelTest {
         assertEquals(78, state.device.batteryPercent)
         assertEquals("1.0.5", state.device.firmwareVersion)
         assertEquals(5, state.settings.size)
+
+        // 上面三个值恰好与 stateIn 的 initialValue 相同（DeviceViewModel 的 initialValue
+        // 直接取仓库当前值），所以**单靠它们无法区分「combine 发射过」与「一直停在 initialValue」**
+        // （ledger Ruling R30，审查者指出）。这里绕开 ViewModel 直接改仓库，再断言状态跟着变 ——
+        // 只有 combine 真的在发射，这一条才可能成立。
+        repository.setFunctionEnabled("stress", true)
+        advanceUntilIdle()
+        assertTrue(viewModel.uiState.value.settings.first { it.id == "stress" }.enabled)
     }
 
     @Test