feat: Enhance test coverage (#4847)

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>

core/domain/src/commonTest/kotlin/org/meshtastic/core/domain/usecase/settings/SetLocaleUseCaseTest.kt

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2026 Meshtastic LLC
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.meshtastic.core.domain.usecase.settings
+
+import dev.mokkery.answering.returns
+import dev.mokkery.every
+import dev.mokkery.matcher.any
+import dev.mokkery.mock
+import dev.mokkery.verify
+import org.meshtastic.core.common.UiPreferences
+import kotlin.test.BeforeTest
+import kotlin.test.Test
+
+class SetLocaleUseCaseTest {
+
+    private val uiPreferences: UiPreferences = mock()
+    private lateinit var useCase: SetLocaleUseCase
+
+    @BeforeTest
+    fun setUp() {
+        useCase = SetLocaleUseCase(uiPreferences)
+    }
+
+    @Test
+    fun `invoke calls setLocale on uiPreferences`() {
+        every { uiPreferences.setLocale(any()) } returns Unit
+        useCase("en")
+        verify { uiPreferences.setLocale("en") }
+    }
+}

core/domain/src/commonTest/kotlin/org/meshtastic/core/domain/usecase/settings/SetNotificationSettingsUseCaseTest.kt

@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2026 Meshtastic LLC
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.meshtastic.core.domain.usecase.settings
+
+import dev.mokkery.answering.returns
+import dev.mokkery.every
+import dev.mokkery.matcher.any
+import dev.mokkery.mock
+import dev.mokkery.verify
+import org.meshtastic.core.repository.NotificationPrefs
+import kotlin.test.BeforeTest
+import kotlin.test.Test
+
+class SetNotificationSettingsUseCaseTest {
+
+    private val notificationPrefs: NotificationPrefs = mock()
+    private lateinit var useCase: SetNotificationSettingsUseCase
+
+    @BeforeTest
+    fun setUp() {
+        useCase = SetNotificationSettingsUseCase(notificationPrefs)
+    }
+
+    @Test
+    fun `setMessagesEnabled calls notificationPrefs`() {
+        every { notificationPrefs.setMessagesEnabled(any()) } returns Unit
+        useCase.setMessagesEnabled(true)
+        verify { notificationPrefs.setMessagesEnabled(true) }
+    }
+
+    @Test
+    fun `setNodeEventsEnabled calls notificationPrefs`() {
+        every { notificationPrefs.setNodeEventsEnabled(any()) } returns Unit
+        useCase.setNodeEventsEnabled(false)
+        verify { notificationPrefs.setNodeEventsEnabled(false) }
+    }
+
+    @Test
+    fun `setLowBatteryEnabled calls notificationPrefs`() {
+        every { notificationPrefs.setLowBatteryEnabled(any()) } returns Unit
+        useCase.setLowBatteryEnabled(true)
+        verify { notificationPrefs.setLowBatteryEnabled(true) }
+    }
+}