Add konsist tests for management service to avoid missing Either

android/test/arch/src/test/kotlin/net/mullvad/mullvadvpn/test/arch/ManagementServiceTest.kt

@@ -0,0 +1,30 @@
+package net.mullvad.mullvadvpn.test.arch
+
+import com.lemonappdev.konsist.api.Konsist
+import com.lemonappdev.konsist.api.ext.list.modifierprovider.withPublicOrDefaultModifier
+import com.lemonappdev.konsist.api.verify.assertTrue
+import org.junit.jupiter.api.Test
+
+class ManagementServiceTest {
+
+    @Test
+    fun `ensure all public functions are returning Either`() {
+        managementServiceClass()
+            .functions()
+            .withPublicOrDefaultModifier()
+            .filter { excludedFunctions().contains(it.name).not() }
+            .assertTrue { it.returnType?.name?.startsWith(EITHER_CLASS_NAME) == true }
+    }
+
+    private fun managementServiceClass() =
+        Konsist.scopeFromProject().classes().first { it.name == MANAGEMENT_SERVICE_CLASS_NAME }
+
+    private fun excludedFunctions() = setOf(START, STOP)
+
+    companion object {
+        private const val MANAGEMENT_SERVICE_CLASS_NAME = "ManagementService"
+        private const val START = "start"
+        private const val STOP = "stop"
+        private const val EITHER_CLASS_NAME = "Either"
+    }
+}