Better way of setting it maybe?

AndroidCompat/Config/src/main/java/xyz/nulldev/ts/config/ConfigManager.kt

@@ -11,7 +11,6 @@ import com.typesafe.config.Config
 import com.typesafe.config.ConfigFactory
 import com.typesafe.config.ConfigRenderOptions
 import mu.KotlinLogging
-import net.harawata.appdirs.AppDirsFactory
 import java.io.File
 
 /**
@@ -47,7 +46,7 @@ open class ConfigManager {
 
         //Load user config
         val userConfig =
-            File(System.getProperty("ir.armor.tachidesk.rootDir"), "server.conf").let {
+            File(tachideskRootDir(), "server.conf").let {
                 ConfigFactory.parseFile(it)
             }
 

AndroidCompat/Config/src/main/java/xyz/nulldev/ts/config/RootDir.kt

@@ -0,0 +1,17 @@
+package xyz.nulldev.ts.config
+
+import net.harawata.appdirs.AppDirsFactory
+
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+fun tachideskRootDir(): String {
+    return System.getProperty(
+            "ir.armor.tachidesk.rootDir",
+            AppDirsFactory.getInstance().getUserDataDir("Tachidesk", null, null)
+    )
+}

server/src/main/kotlin/ir/armor/tachidesk/server/ServerSetup.kt

@@ -8,29 +8,27 @@ package ir.armor.tachidesk.server
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 import ch.qos.logback.classic.Level
-import com.typesafe.config.Config
 import eu.kanade.tachiyomi.App
 import ir.armor.tachidesk.Main
 import ir.armor.tachidesk.model.dataclass.makeDataBaseTables
 import ir.armor.tachidesk.server.util.systemTray
 import mu.KotlinLogging
-import net.harawata.appdirs.AppDirsFactory
 import org.kodein.di.DI
 import org.kodein.di.bind
 import org.kodein.di.conf.global
-import org.kodein.di.instance
 import org.kodein.di.singleton
 import org.slf4j.Logger
 import xyz.nulldev.androidcompat.AndroidCompat
 import xyz.nulldev.androidcompat.AndroidCompatInitializer
 import xyz.nulldev.ts.config.ConfigKodeinModule
 import xyz.nulldev.ts.config.GlobalConfigManager
+import xyz.nulldev.ts.config.tachideskRootDir
 import java.io.File
 
 private val logger = KotlinLogging.logger {}
 
 class ApplicationDirs(
-    val dataRoot: String = AppDirsFactory.getInstance().getUserDataDir("Tachidesk", null, null)
+    val dataRoot: String = tachideskRootDir()
 ) {
     val extensionsRoot = "$dataRoot/extensions"
     val thumbnailsRoot = "$dataRoot/thumbnails"
@@ -44,21 +42,18 @@ val systemTray by lazy { systemTray() }
 val androidCompat by lazy { AndroidCompat() }
 
 fun applicationSetup() {
-    val rootDir: String? = System.getProperty("ir.armor.tachidesk.rootDir")
-    val dirs = if (rootDir != null) {
-        ApplicationDirs(rootDir)
-    } else {
-        ApplicationDirs().also {
-            System.setProperty("ir.armor.tachidesk.rootDir", it.dataRoot)
-        }
-    }
+    // Application dirs
+    val applicationDirs = ApplicationDirs()
+    DI.global.addImport(DI.Module("Server") {
+        bind<ApplicationDirs>() with singleton { applicationDirs }
+    })
 
     // make dirs we need
     listOf(
-        dirs.dataRoot,
-        dirs.extensionsRoot,
-        dirs.extensionsRoot + "/icon",
-        dirs.thumbnailsRoot
+        applicationDirs.dataRoot,
+        applicationDirs.extensionsRoot,
+        applicationDirs.extensionsRoot + "/icon",
+        applicationDirs.thumbnailsRoot
     ).forEach {
         File(it).mkdirs()
     }
@@ -67,10 +62,6 @@ fun applicationSetup() {
         ServerConfig.register(GlobalConfigManager.config)
     )
 
-    // Application dirs
-    DI.global.addImport(DI.Module("Server") {
-        bind<ApplicationDirs>() with singleton { dirs }
-    })
     // Load config API
     DI.global.addImport(ConfigKodeinModule().create())
     // Load Android compatibility dependencies
@@ -85,7 +76,7 @@ fun applicationSetup() {
 
     // create conf file if doesn't exist
     try {
-        val dataConfFile = File("${dirs.dataRoot}/server.conf")
+        val dataConfFile = File("${applicationDirs.dataRoot}/server.conf")
         if (!dataConfFile.exists()) {
             Main::class.java.getResourceAsStream("/server-reference.conf").use { input ->
                 dataConfFile.outputStream().use { output ->

server/src/test/kotlin/ir/armor/tachidesk/TestExtensions.kt

@@ -44,6 +44,7 @@ class TestExtensions {
         System.setProperty("ir.armor.tachidesk.rootDir", dataRoot)
         applicationSetup()
         setLoggingEnabled(false)
+
         runBlocking {
             extensions = getExtensionList()
             extensions.forEach {