diff --git a/api/src/Dependencies.kt b/api/src/Dependencies.kt
new file mode 100644
index 0000000..c77fcd7
--- /dev/null
+++ b/api/src/Dependencies.kt
@@ -0,0 +1,21 @@
+package be.vandewalleh
+
+import be.vandewalleh.features.configurationModule
+import be.vandewalleh.migrations.Migration
+import be.vandewalleh.services.serviceModule
+import me.liuwj.ktorm.database.*
+import org.kodein.di.Kodein
+import org.kodein.di.generic.bind
+import org.kodein.di.generic.instance
+import org.kodein.di.generic.singleton
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+import javax.sql.DataSource
+
+val mainModule = Kodein.Module("main") {
+    import(serviceModule)
+    import(configurationModule)
+    bind<Logger>() with singleton { LoggerFactory.getLogger("Application") }
+    bind<Migration>() with singleton { Migration(this.kodein) }
+    bind<Database>() with singleton { Database.connect(this.instance<DataSource>()) }
+}
diff --git a/api/src/NotesApplication.kt b/api/src/NotesApplication.kt
index 7774f5f..e52d240 100644
--- a/api/src/NotesApplication.kt
+++ b/api/src/NotesApplication.kt
@@ -20,15 +20,13 @@ import org.slf4j.Logger
 import org.slf4j.LoggerFactory
 import javax.sql.DataSource
 
-val kodein = Kodein {
-    import(serviceModule)
-    import(configurationModule)
-    bind<Logger>() with singleton { LoggerFactory.getLogger("Application") }
-    bind<Migration>() with singleton { Migration(this.kodein) }
-    bind<Database>() with singleton { Database.connect(this.instance<DataSource>()) }
-}
 
 fun main() {
+
+    val kodein = Kodein{
+        import(mainModule)
+    }
+
     val config by kodein.instance<Config>()
     val logger by kodein.instance<Logger>()
     logger.info("Running application with configuration $config")
@@ -43,7 +41,7 @@ fun serve(kodein: Kodein) {
     val logger by kodein.instance<Logger>()
     val env = applicationEngineEnvironment {
         module {
-            module()
+            module(kodein)
         }
         log = logger
         connector {
@@ -55,7 +53,7 @@ fun serve(kodein: Kodein) {
 }
 
 
-fun Application.module() {
+fun Application.module(kodein: Kodein) {
     loadFeatures(kodein)
 
     routing {
diff --git a/api/src/auth/AuthenticationModule.kt b/api/src/auth/AuthenticationModule.kt
index cea8b90..33e3441 100644
--- a/api/src/auth/AuthenticationModule.kt
+++ b/api/src/auth/AuthenticationModule.kt
@@ -1,12 +1,12 @@
 package be.vandewalleh.auth
 
-import be.vandewalleh.kodein
 import io.ktor.application.*
 import io.ktor.auth.*
 import io.ktor.auth.jwt.*
+import org.kodein.di.Kodein
 import org.kodein.di.generic.instance
 
-fun Application.authenticationModule() {
+fun Application.authenticationModule(kodein: Kodein) {
     install(Authentication) {
         jwt {
             val simpleJwt by kodein.instance<SimpleJWT>(tag = "auth")
diff --git a/api/src/features/Features.kt b/api/src/features/Features.kt
index 22be429..cea8bd3 100644
--- a/api/src/features/Features.kt
+++ b/api/src/features/Features.kt
@@ -11,6 +11,6 @@ fun Application.loadFeatures(kodein: Kodein) {
         corsFeature()
     }
     contentNegotiationFeature()
-    authenticationModule()
+    authenticationModule(kodein)
     handleErrors()
 }
diff --git a/api/test/services/UserServiceTest.kt b/api/test/services/UserServiceTest.kt
index 3cfc9a4..d9a6c57 100644
--- a/api/test/services/UserServiceTest.kt
+++ b/api/test/services/UserServiceTest.kt
@@ -1,18 +1,16 @@
 package services
 
+import be.vandewalleh.mainModule
 import be.vandewalleh.migrations.Migration
-import be.vandewalleh.services.NotesService
 import be.vandewalleh.services.UserService
-import com.zaxxer.hikari.HikariConfig
-import com.zaxxer.hikari.HikariDataSource
-import me.liuwj.ktorm.database.*
 import org.amshove.kluent.*
 import org.junit.jupiter.api.*
 import org.kodein.di.Kodein
 import org.kodein.di.generic.bind
 import org.kodein.di.generic.instance
 import org.kodein.di.generic.singleton
-import org.testcontainers.containers.MariaDBContainer
+import utils.KMariadbContainer
+import utils.testContainerDataSource
 import javax.sql.DataSource
 
 
@@ -20,28 +18,11 @@ import javax.sql.DataSource
 @TestMethodOrder(MethodOrderer.OrderAnnotation::class)
 class UserServiceTest {
 
-    class KMariadbContainer : MariaDBContainer<KMariadbContainer>()
-
-    private val mariadb = KMariadbContainer().apply {
-        this.start()
-    }
-
-    private val hikariConfig = HikariConfig().apply {
-        jdbcUrl = mariadb.jdbcUrl
-        username = mariadb.username
-        password = mariadb.password
-    }
-
-    private val dataSource = HikariDataSource(hikariConfig)
-
-    private val db = Database.Companion.connect(dataSource)
+    private val mariadb = KMariadbContainer().apply { start() }
 
     private val kodein = Kodein {
-        bind<DataSource>() with singleton { dataSource }
-        bind<Database>() with singleton { db }
-        bind<Migration>() with singleton { Migration(this.kodein) }
-        bind<UserService>() with singleton { UserService(this.kodein) }
-        bind<NotesService>() with singleton { NotesService(this.kodein) }
+        import(mainModule, allowOverride = true)
+        bind<DataSource>(overrides = true) with singleton { testContainerDataSource(mariadb) }
     }
 
     private val migration by kodein.instance<Migration>()
diff --git a/api/test/utils/TestContainers.kt b/api/test/utils/TestContainers.kt
new file mode 100644
index 0000000..1254a68
--- /dev/null
+++ b/api/test/utils/TestContainers.kt
@@ -0,0 +1,18 @@
+package utils
+
+import com.zaxxer.hikari.HikariConfig
+import com.zaxxer.hikari.HikariDataSource
+import org.testcontainers.containers.MariaDBContainer
+import javax.sql.DataSource
+
+class KMariadbContainer : MariaDBContainer<KMariadbContainer>()
+
+fun testContainerDataSource(container: KMariadbContainer): DataSource {
+    val hikariConfig = HikariConfig().apply {
+        jdbcUrl = container.jdbcUrl
+        username = container.username
+        password = container.password
+    }
+
+    return HikariDataSource(hikariConfig)
+}