diff --git a/build.gradle.kts b/build.gradle.kts
index 6b54e47..7e1b236 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -3,6 +3,7 @@ import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 plugins {
     id("org.springframework.boot") version "3.3.4"
     id("io.spring.dependency-management") version "1.1.6"
+    id("org.jlleitschuh.gradle.ktlint") version "12.1.1"
     kotlin("jvm") version "1.9.25"
     kotlin("plugin.spring") version "1.9.25"
 }
@@ -26,6 +27,22 @@ dependencies {
     implementation("info.picocli:picocli-spring-boot-starter:4.7.6")
 
     testImplementation("org.springframework.boot:spring-boot-starter-test")
+
+    // Kotest
+    testImplementation("io.kotest:kotest-runner-junit5:5.9.1")
+    testImplementation("io.kotest:kotest-assertions-core:5.9.1")
+    testImplementation("io.kotest.extensions:kotest-extensions-spring:1.3.0")
+
+    // MockK
+    testImplementation("io.mockk:mockk:1.13.11")
+    testImplementation("com.ninja-squad:springmockk:4.0.2")
+
+    // WireMock
+    testImplementation("org.wiremock.integrations:wiremock-spring-boot:3.1.0")
+
+    // Testcontainers (versions managed by Spring Boot BOM)
+    testImplementation("org.springframework.boot:spring-boot-testcontainers")
+    testImplementation("org.testcontainers:testcontainers")
 }
 
 tasks.withType<KotlinCompile> {
diff --git a/src/main/kotlin/de/hoennig/gittally/GitTallyApplication.kt b/src/main/kotlin/de/hoennig/gittally/GitTallyApplication.kt
index f2c122e..0b5fe66 100644
--- a/src/main/kotlin/de/hoennig/gittally/GitTallyApplication.kt
+++ b/src/main/kotlin/de/hoennig/gittally/GitTallyApplication.kt
@@ -1,22 +1,32 @@
 package de.hoennig.gittally
 
 import org.springframework.boot.CommandLineRunner
+import org.springframework.boot.ExitCodeGenerator
+import org.springframework.boot.SpringApplication
 import org.springframework.boot.autoconfigure.SpringBootApplication
 import org.springframework.boot.runApplication
+import org.springframework.stereotype.Component
 import picocli.CommandLine
 import picocli.CommandLine.IFactory
 import kotlin.system.exitProcess
 
 @SpringBootApplication
-class GitTallyApplication(
+class GitTallyApplication
+
+@Component
+class CliRunner(
     private val factory: IFactory,
     private val rootCommand: GitTallyCommand,
-) : CommandLineRunner {
+) : CommandLineRunner, ExitCodeGenerator {
+    private var exitCode = 0
+
     override fun run(vararg args: String) {
-        exitProcess(CommandLine(rootCommand, factory).execute(*args))
+        exitCode = CommandLine(rootCommand, factory).execute(*args)
     }
+
+    override fun getExitCode() = exitCode
 }
 
 fun main(args: Array<String>) {
-    runApplication<GitTallyApplication>(*args)
+    exitProcess(SpringApplication.exit(runApplication<GitTallyApplication>(*args)))
 }
diff --git a/src/main/kotlin/de/hoennig/gittally/commands/ConfigPrintCommand.kt b/src/main/kotlin/de/hoennig/gittally/commands/ConfigPrintCommand.kt
index f5e724e..b7f372c 100644
--- a/src/main/kotlin/de/hoennig/gittally/commands/ConfigPrintCommand.kt
+++ b/src/main/kotlin/de/hoennig/gittally/commands/ConfigPrintCommand.kt
@@ -11,7 +11,6 @@ import picocli.CommandLine.Option
     mixinStandardHelpOptions = true,
 )
 class ConfigPrintCommand : Runnable {
-
     @Option(names = ["--full"], description = ["Include all defaults"])
     var full: Boolean = false
 
diff --git a/src/test/kotlin/de/hoennig/gittally/ApplicationContextTest.kt b/src/test/kotlin/de/hoennig/gittally/ApplicationContextTest.kt
new file mode 100644
index 0000000..1111b60
--- /dev/null
+++ b/src/test/kotlin/de/hoennig/gittally/ApplicationContextTest.kt
@@ -0,0 +1,36 @@
+package de.hoennig.gittally
+
+import de.hoennig.gittally.commands.ConfigPrintCommand
+import de.hoennig.gittally.commands.InitCommand
+import de.hoennig.gittally.commands.ServerCommand
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldNotBe
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.context.SpringBootTest
+
+@SpringBootTest
+class ApplicationContextTest : FunSpec() {
+    @Autowired
+    lateinit var rootCommand: GitTallyCommand
+
+    @Autowired
+    lateinit var initCommand: InitCommand
+
+    @Autowired
+    lateinit var serverCommand: ServerCommand
+
+    @Autowired
+    lateinit var configPrintCommand: ConfigPrintCommand
+
+    init {
+        test("application context loads") {
+            rootCommand shouldNotBe null
+        }
+
+        test("all subcommands are wired") {
+            initCommand shouldNotBe null
+            serverCommand shouldNotBe null
+            configPrintCommand shouldNotBe null
+        }
+    }
+}
diff --git a/src/test/kotlin/de/hoennig/gittally/KotestProjectConfig.kt b/src/test/kotlin/de/hoennig/gittally/KotestProjectConfig.kt
new file mode 100644
index 0000000..13f7379
--- /dev/null
+++ b/src/test/kotlin/de/hoennig/gittally/KotestProjectConfig.kt
@@ -0,0 +1,8 @@
+package de.hoennig.gittally
+
+import io.kotest.core.config.AbstractProjectConfig
+import io.kotest.extensions.spring.SpringExtension
+
+object KotestProjectConfig : AbstractProjectConfig() {
+    override fun extensions() = listOf(SpringExtension)
+}