diff --git a/cargo.go b/cargo.go
index 68faffc..8935969 100644
--- a/cargo.go
+++ b/cargo.go
@@ -1,9 +1,5 @@
 package main
 
-import (
-	"os/exec"
-)
-
 type CargoManager struct{}
 
 func (c *CargoManager) Install(packages []string) error {
@@ -22,19 +18,19 @@ func (c *CargoManager) Name() string {
 }
 
 func (c *CargoManager) InstallManager() error {
-	if _, err := exec.LookPath("brew"); err != nil {
+	if _, err := execLookPath("brew"); err != nil {
 		installHomebrew()
 	}
 
-	if _, err := exec.LookPath("cargo"); err == nil {
+	if _, err := execLookPath("cargo"); err == nil {
 		return nil
 	}
 
-	cmd := exec.Command("brew", "install", "rust")
+	cmd := execCommand("brew", "install", "rust")
 	return cmd.Run()
 }
 
 func (c *CargoManager) InstallPackage(pkg string) error {
-	cmd := exec.Command("cargo", "install", pkg)
+	cmd := execCommand("cargo", "install", pkg)
 	return cmd.Run()
 }
diff --git a/cargo_test.go b/cargo_test.go
new file mode 100644
index 0000000..5129f56
--- /dev/null
+++ b/cargo_test.go
@@ -0,0 +1,45 @@
+// cargo_test.go
+package main
+
+import (
+	"os/exec"
+	"testing"
+)
+
+func TestCargoManager_Name(t *testing.T) {
+	cm := &CargoManager{}
+	if name := cm.Name(); name != "Cargo" {
+		t.Errorf("Expected name to be 'Cargo', got %s", name)
+	}
+}
+
+func TestCargoManager_InstallManager(t *testing.T) {
+	cm := &CargoManager{}
+
+	// Mock exec.LookPath
+	execLookPath = func(file string) (string, error) {
+		if file == "cargo" {
+			return "/usr/bin/cargo", nil
+		}
+		return "", exec.ErrNotFound
+	}
+	defer func() { execLookPath = exec.LookPath }()
+
+	if err := cm.InstallManager(); err != nil {
+		t.Errorf("Expected no error, got %v", err)
+	}
+}
+
+func TestCargoManager_InstallPackage(t *testing.T) {
+	cm := &CargoManager{}
+
+	// Mock exec.Command
+	execCommand = func(name string, arg ...string) *exec.Cmd {
+		return exec.Command("echo", "mocked cargo install")
+	}
+	defer func() { execCommand = exec.Command }()
+
+	if err := cm.InstallPackage("test-package"); err != nil {
+		t.Errorf("Expected no error, got %v", err)
+	}
+}
diff --git a/dotfiles.go b/dotfiles.go
index 08f3d52..849da76 100644
--- a/dotfiles.go
+++ b/dotfiles.go
@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"log"
 	"os"
-	"os/exec"
 	"path/filepath"
 )
 
@@ -14,18 +13,17 @@ type DotfilesConfig struct {
 }
 
 func setupDotfiles(config DotfilesConfig) error {
-	if _, err := exec.LookPath("git"); err != nil {
+	if _, err := execLookPath("git"); err != nil {
 		return fmt.Errorf("git ist nicht installiert")
 	}
 
-	if _, err := exec.LookPath("stow"); err != nil {
+	if _, err := execLookPath("stow"); err != nil {
 		return fmt.Errorf("gnu stow ist nicht installiert")
 	}
 
 	dotfilesDir := filepath.Join(os.Getenv("HOME"), "dotfiles")
 
-	// cmd := exec.Command("git", "clone", config.GitRepo)
-	cmd := exec.Command("git", "clone", config.GitRepo, dotfilesDir)
+	cmd := execCommand("git", "clone", config.GitRepo, dotfilesDir)
 	if err := cmd.Run(); err != nil {
 		return fmt.Errorf("fehler beim Klonen der Dotfiles: %v", err)
 	}
@@ -34,7 +32,7 @@ func setupDotfiles(config DotfilesConfig) error {
 		return fmt.Errorf("fehler beim Wechseln in das Dotfiles-Verzeichnis: %v", err)
 	}
 
-	cmd = exec.Command("stow", ".", "--override='*'")
+	cmd = execCommand("stow", ".", "--override='*'")
 	if err := cmd.Run(); err != nil {
 		log.Printf("Fehler beim Linken: %v", err)
 	}
diff --git a/flatpak.go b/flatpak.go
index 5e8d1a5..4f2bf4c 100644
--- a/flatpak.go
+++ b/flatpak.go
@@ -75,7 +75,7 @@ func installFlatpak(os *OS, sudoPassword string) error {
 
 func addFlatpakRemotes(remotes []Remote) error {
 	for _, remote := range remotes {
-		cmd := exec.Command("flatpak", "remote-add", "--if-not-exists", remote.Name, remote.URL)
+		cmd := execCommand("flatpak", "remote-add", "--if-not-exists", remote.Name, remote.URL)
 		if err := cmd.Run(); err != nil {
 			return fmt.Errorf("fehler beim Hinzufügen des Remotes %s: %v", remote.Name, err)
 		}
@@ -84,6 +84,6 @@ func addFlatpakRemotes(remotes []Remote) error {
 }
 
 func (f *FlatpakManager) InstallPackage(pkg string) error {
-	cmd := exec.Command("flatpak", "install", "-y", pkg)
+	cmd := execCommand("flatpak", "install", "-y", pkg)
 	return cmd.Run()
 }
diff --git a/flatpak_test.go b/flatpak_test.go
new file mode 100644
index 0000000..c99e2d5
--- /dev/null
+++ b/flatpak_test.go
@@ -0,0 +1,44 @@
+// flatpak_test.go
+package main
+
+import (
+	"os/exec"
+	"testing"
+)
+
+func TestFlatpakManager_Name(t *testing.T) {
+	fm := &FlatpakManager{}
+	if name := fm.Name(); name != "Flatpak" {
+		t.Errorf("Expected name to be 'Flatpak', got %s", name)
+	}
+}
+
+func TestFlatpakManager_InstallManager(t *testing.T) {
+	fm := &FlatpakManager{
+		OS:           &OS{PackageManager: "apt"},
+		SudoPassword: "testpass",
+		Config: FlatpakConfig{
+			Remotes: []Remote{{Name: "test", URL: "http://test.com"}},
+		},
+	}
+
+	// Mock exec.LookPath and other functions as needed
+
+	if err := fm.InstallManager(); err != nil {
+		t.Errorf("Expected no error, got %v", err)
+	}
+}
+
+func TestFlatpakManager_InstallPackage(t *testing.T) {
+	fm := &FlatpakManager{}
+
+	// Mock exec.Command
+	execCommand = func(name string, arg ...string) *exec.Cmd {
+		return exec.Command("echo", "mocked flatpak install")
+	}
+	defer func() { execCommand = exec.Command }()
+
+	if err := fm.InstallPackage("test-package"); err != nil {
+		t.Errorf("Expected no error, got %v", err)
+	}
+}
diff --git a/go.mod b/go.mod
index 29cf3f7..b11c96d 100644
--- a/go.mod
+++ b/go.mod
@@ -20,6 +20,7 @@ require (
 	github.com/charmbracelet/x/ansi v0.4.5 // indirect
 	github.com/charmbracelet/x/exp/strings v0.0.0-20240722160745-212f7b056ed0 // indirect
 	github.com/charmbracelet/x/term v0.2.1 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
@@ -41,6 +42,7 @@ require (
 	github.com/muesli/reflow v0.3.0 // indirect
 	github.com/muesli/termenv v0.15.3-0.20240618155329-98d742f6907a // indirect
 	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/sagikazarmark/locafero v0.4.0 // indirect
 	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
@@ -49,6 +51,8 @@ require (
 	github.com/spf13/afero v1.11.0 // indirect
 	github.com/spf13/cast v1.6.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/stretchr/piglatin v0.0.0-20140311054444-ab61287b9936 // indirect
+	github.com/stretchr/testify v1.10.0 // indirect
 	github.com/subosito/gotenv v1.6.0 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
 	go.uber.org/atomic v1.9.0 // indirect
diff --git a/go.sum b/go.sum
index afddadc..59f7dbe 100644
--- a/go.sum
+++ b/go.sum
@@ -118,12 +118,16 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
 github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
+github.com/stretchr/piglatin v0.0.0-20140311054444-ab61287b9936 h1:QcF4JZjvg9uNP9SdKFXspe6keOBZ1XmXkb25badRIkY=
+github.com/stretchr/piglatin v0.0.0-20140311054444-ab61287b9936/go.mod h1:fnVlYnscMLDEmGbdH+GXr7JHxZCj7pCoRap6A74K5lY=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/subosito/gotenv v1.6.0 h1:9NlTDc1FTs4qu0DDq7AEtTPNw6SVm7uBMsUCUjABIf8=
 github.com/subosito/gotenv v1.6.0/go.mod h1:Dk4QP5c2W3ibzajGcXpNraDfq2IrhjMIvMSWPKKo0FU=
 github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778/go.mod h1:2MuV+tbUrU1zIOPMxZ5EncGwgmMJsa+9ucAQZXxsObs=
diff --git a/golang.go b/golang.go
index 1bcaca8..b209eab 100644
--- a/golang.go
+++ b/golang.go
@@ -1,9 +1,5 @@
 package main
 
-import (
-	"os/exec"
-)
-
 type GolangManager struct{}
 
 func (g *GolangManager) Install(packages []string) error {
@@ -22,19 +18,19 @@ func (g *GolangManager) Name() string {
 }
 
 func (g *GolangManager) InstallManager() error {
-	if _, err := exec.LookPath("brew"); err != nil {
+	if _, err := execLookPath("brew"); err != nil {
 		installHomebrew()
 	}
 
-	if _, err := exec.LookPath("go"); err == nil {
+	if _, err := execLookPath("go"); err == nil {
 		return nil
 	}
 
-	cmd := exec.Command("brew", "install", "golang")
+	cmd := execCommand("brew", "install", "golang")
 	return cmd.Run()
 }
 
 func (g *GolangManager) InstallPackage(pkg string) error {
-	cmd := exec.Command("go", "install", pkg+"@latest")
+	cmd := execCommand("go", "install", pkg+"@latest")
 	return cmd.Run()
 }
diff --git a/golang_test.go b/golang_test.go
new file mode 100644
index 0000000..5e67b0a
--- /dev/null
+++ b/golang_test.go
@@ -0,0 +1,45 @@
+// golang_test.go
+package main
+
+import (
+	"os/exec"
+	"testing"
+)
+
+func TestGolangManager_Name(t *testing.T) {
+	gm := &GolangManager{}
+	if name := gm.Name(); name != "Golang" {
+		t.Errorf("Expected name to be 'Golang', got %s", name)
+	}
+}
+
+func TestGolangManager_InstallManager(t *testing.T) {
+	gm := &GolangManager{}
+
+	// Mock exec.LookPath
+	execLookPath = func(file string) (string, error) {
+		if file == "go" {
+			return "/usr/local/go/bin/go", nil
+		}
+		return "", exec.ErrNotFound
+	}
+	defer func() { execLookPath = exec.LookPath }()
+
+	if err := gm.InstallManager(); err != nil {
+		t.Errorf("Expected no error, got %v", err)
+	}
+}
+
+func TestGolangManager_InstallPackage(t *testing.T) {
+	gm := &GolangManager{}
+
+	// Mock exec.Command
+	execCommand = func(name string, arg ...string) *exec.Cmd {
+		return exec.Command("echo", "mocked go install")
+	}
+	defer func() { execCommand = exec.Command }()
+
+	if err := gm.InstallPackage("github.com/test/package"); err != nil {
+		t.Errorf("Expected no error, got %v", err)
+	}
+}
diff --git a/homebrew.go b/homebrew.go
index 56b7e56..528631f 100644
--- a/homebrew.go
+++ b/homebrew.go
@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"os/exec"
 )
 
 type HomebrewManager struct{}
@@ -23,7 +22,7 @@ func (h *HomebrewManager) Name() string {
 }
 
 func (h *HomebrewManager) InstallManager() error {
-	if _, err := exec.LookPath("brew"); err == nil {
+	if _, err := execLookPath("brew"); err == nil {
 		return nil
 	}
 
@@ -39,6 +38,6 @@ func installHomebrew() error {
 }
 
 func (h *HomebrewManager) InstallPackage(pkg string) error {
-	cmd := exec.Command("brew", "install", pkg)
+	cmd := execCommand("brew", "install", pkg)
 	return cmd.Run()
 }
diff --git a/homebrew_test.go b/homebrew_test.go
new file mode 100644
index 0000000..72da6ee
--- /dev/null
+++ b/homebrew_test.go
@@ -0,0 +1,45 @@
+// homebrew_test.go
+package main
+
+import (
+	"os/exec"
+	"testing"
+)
+
+func TestHomebrewManager_Name(t *testing.T) {
+	hm := &HomebrewManager{}
+	if name := hm.Name(); name != "Homebrew" {
+		t.Errorf("Expected name to be 'Homebrew', got %s", name)
+	}
+}
+
+func TestHomebrewManager_InstallManager(t *testing.T) {
+	hm := &HomebrewManager{}
+
+	// Mock exec.LookPath and executeShellCommand
+	execLookPath = func(file string) (string, error) {
+		if file == "brew" {
+			return "/usr/local/bin/brew", nil
+		}
+		return "", exec.ErrNotFound
+	}
+	defer func() { execLookPath = exec.LookPath }()
+
+	if err := hm.InstallManager(); err != nil {
+		t.Errorf("Expected no error, got %v", err)
+	}
+}
+
+func TestHomebrewManager_InstallPackage(t *testing.T) {
+	hm := &HomebrewManager{}
+
+	// Mock exec.Command
+	execCommand = func(name string, arg ...string) *exec.Cmd {
+		return exec.Command("echo", "mocked brew install")
+	}
+	defer func() { execCommand = exec.Command }()
+
+	if err := hm.InstallPackage("test-package"); err != nil {
+		t.Errorf("Expected no error, got %v", err)
+	}
+}
diff --git a/magefile.go b/magefile.go
index 35fe78a..3603577 100644
--- a/magefile.go
+++ b/magefile.go
@@ -19,7 +19,7 @@ import (
 func Build() error {
 	mg.Deps(InstallDeps)
 	fmt.Println("Building...")
-	cmd := exec.Command("go", "build", "-o", "MyApp", ".")
+	cmd := exec.Command("go", "build", "-o", "system_setup_tool", ".")
 	return cmd.Run()
 }
 
@@ -27,7 +27,7 @@ func Build() error {
 func Install() error {
 	mg.Deps(Build)
 	fmt.Println("Installing...")
-	return os.Rename("./MyApp", "/usr/bin/MyApp")
+	return os.Rename("./system_setup_tool", "/usr/bin/system_setup_tool")
 }
 
 // Manage your deps, or running package managers.
@@ -56,3 +56,10 @@ func Lint() error {
 	cmd := exec.Command("golangci-lint", "./...")
 	return cmd.Run()
 }
+
+// perform all modul tests
+func Test() error {
+	fmt.Println("Testing...")
+	cmd := exec.Command("go", "test", "./...")
+	return cmd.Run()
+}
diff --git a/model.go b/model.go
index 0b14fca..41cb2e6 100644
--- a/model.go
+++ b/model.go
@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"log"
 	"os"
-	"os/exec"
 	"path/filepath"
 	"strings"
 
@@ -27,7 +26,7 @@ type model struct {
 }
 
 func (m model) installSpecialSoftware() error {
-	if _, err := exec.LookPath("oh-my-posh"); err == nil {
+	if _, err := execLookPath("oh-my-posh"); err == nil {
 		fmt.Println("Oh-my-posh ist bereits installiert")
 	} else {
 		poshCommand := "curl -s https://ohmyposh.dev/install.sh | bash -s"
diff --git a/osinfo.go b/osinfo.go
index 079c938..195dc4c 100644
--- a/osinfo.go
+++ b/osinfo.go
@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"log"
 	"os"
-	"os/exec"
 	"strings"
 
 	tea "github.com/charmbracelet/bubbletea"
@@ -120,7 +119,7 @@ func (os *OS) getPackageManager() error {
 			"pacman",
 		}
 		for _, pmname := range pmcommands {
-			_, err := exec.LookPath(pmname)
+			_, err := execLookPath(pmname)
 			if err == nil {
 				os.PackageManager = pmname
 				return nil
diff --git a/osinfo_test.go b/osinfo_test.go
new file mode 100644
index 0000000..ddca2ec
--- /dev/null
+++ b/osinfo_test.go
@@ -0,0 +1,50 @@
+// osmanager_test.go
+package main
+
+import (
+	"testing"
+)
+
+func TestNewOSManager(t *testing.T) {
+	os := &OS{ID: "ubuntu", PackageManager: "apt"}
+	sudoPassword := "testpassword"
+	packages := []string{"git", "curl"}
+
+	manager := NewOSManager(os, sudoPassword, packages)
+
+	if manager.OS != os {
+		t.Errorf("Expected OS to be %v, got %v", os, manager.OS)
+	}
+	if manager.SudoPassword != sudoPassword {
+		t.Errorf("Expected SudoPassword to be %s, got %s", sudoPassword, manager.SudoPassword)
+	}
+	if len(manager.Packages) != len(packages) {
+		t.Errorf("Expected Packages length to be %d, got %d", len(packages), len(manager.Packages))
+	}
+}
+
+func TestOSManagerName(t *testing.T) {
+	manager := &OSManager{}
+	if manager.Name() != "OS Package Manager" {
+		t.Errorf("Expected name to be 'OS Package Manager', got %s", manager.Name())
+	}
+}
+
+func TestParseOsRelease(t *testing.T) {
+	osReleaseContent := `
+ID=ubuntu
+NAME="Ubuntu"
+VERSION_ID="20.04"
+`
+	os := parseOsRelease(osReleaseContent)
+
+	if os.ID != "ubuntu" {
+		t.Errorf("Expected ID to be 'ubuntu', got %s", os.ID)
+	}
+	if os.Name != "Ubuntu" {
+		t.Errorf("Expected Name to be 'Ubuntu', got %s", os.Name)
+	}
+	if os.Version != "20.04" {
+		t.Errorf("Expected Version to be '20.04', got %s", os.Version)
+	}
+}
diff --git a/package.go b/package.go
index 32d901a..77b7a46 100644
--- a/package.go
+++ b/package.go
@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"os/exec"
 	"strings"
 )
 
@@ -13,7 +12,7 @@ type Packages struct {
 
 func installPackage(cmd, pkg, sudoPassword string) error {
 	fullCmd := fmt.Sprintf("%s %s", cmd, pkg)
-	command := exec.Command("sudo", "-S", "sh", "-c", fullCmd)
+	command := execCommand("sudo", "-S", "sh", "-c", fullCmd)
 	command.Stdin = strings.NewReader(sudoPassword + "\n")
 	output, err := command.CombinedOutput()
 	if err != nil {
diff --git a/pipx.go b/pipx.go
index 7ba895c..ddbcd34 100644
--- a/pipx.go
+++ b/pipx.go
@@ -1,9 +1,5 @@
 package main
 
-import (
-	"os/exec"
-)
-
 type PipxManager struct{}
 
 func (p *PipxManager) Install(packages []string) error {
@@ -23,19 +19,19 @@ func (p *PipxManager) Name() string {
 }
 
 func (p *PipxManager) InstallManager() error {
-	if _, err := exec.LookPath("brew"); err != nil {
+	if _, err := execLookPath("brew"); err != nil {
 		installHomebrew()
 	}
 
-	if _, err := exec.LookPath("pipx"); err == nil {
+	if _, err := execLookPath("pipx"); err == nil {
 		return nil
 	}
 
-	cmd := exec.Command("brew", "install", "pipx")
+	cmd := execCommand("brew", "install", "pipx")
 	return cmd.Run()
 }
 
 func (p *PipxManager) InstallPackage(pkg string) error {
-	cmd := exec.Command("pipx", "install", pkg)
+	cmd := execCommand("pipx", "install", pkg)
 	return cmd.Run()
 }
diff --git a/pipx_test.go b/pipx_test.go
new file mode 100644
index 0000000..a7f7389
--- /dev/null
+++ b/pipx_test.go
@@ -0,0 +1,45 @@
+// pipx_test.go
+package main
+
+import (
+	"os/exec"
+	"testing"
+)
+
+func TestPipxManager_Name(t *testing.T) {
+	pm := &PipxManager{}
+	if name := pm.Name(); name != "Pipx" {
+		t.Errorf("Expected name to be 'Pipx', got %s", name)
+	}
+}
+
+func TestPipxManager_InstallManager(t *testing.T) {
+	pm := &PipxManager{}
+
+	// Mock exec.LookPath
+	execLookPath = func(file string) (string, error) {
+		if file == "pipx" {
+			return "/usr/bin/pipx", nil
+		}
+		return "", exec.ErrNotFound
+	}
+	defer func() { execLookPath = exec.LookPath }()
+
+	if err := pm.InstallManager(); err != nil {
+		t.Errorf("Expected no error, got %v", err)
+	}
+}
+
+func TestPipxManager_InstallPackage(t *testing.T) {
+	pm := &PipxManager{}
+
+	// Mock exec.Command
+	execCommand = func(name string, arg ...string) *exec.Cmd {
+		return exec.Command("echo", "mocked pipx install")
+	}
+	defer func() { execCommand = exec.Command }()
+
+	if err := pm.InstallPackage("test-package"); err != nil {
+		t.Errorf("Expected no error, got %v", err)
+	}
+}
diff --git a/tui.go b/tui.go
index cc4ee26..ab1be10 100644
--- a/tui.go
+++ b/tui.go
@@ -18,8 +18,6 @@ var (
 	unavailablePackages []string
 )
 
-// type installedItemMsg string
-
 type installedPkgMsg string
 
 func run(cmd *cobra.Command, args []string) {
diff --git a/utils.go b/utils.go
index ea0de75..58f6896 100644
--- a/utils.go
+++ b/utils.go
@@ -2,17 +2,19 @@ package main
 
 import (
 	"fmt"
-	// "io"
 	"log"
-	// "net/http"
 	"os"
 	"os/exec"
-	// "runtime"
 
 	"github.com/charmbracelet/huh"
 	"github.com/schollz/progressbar/v3"
 )
 
+var (
+	execCommand  = exec.Command
+	execLookPath = exec.LookPath
+)
+
 func getSudoPassword() (string, error) {
 	var password string
 	form := huh.NewForm(
@@ -31,37 +33,6 @@ func getSudoPassword() (string, error) {
 	return password, nil
 }
 
-// func downloadGolang(golangVersion string) error {
-// 	var link string
-// 	if runtime.GOARCH == "arm64" {
-// 		link = "https://go.dev/dl/go" + golangVersion + ".linux-arm64.tar.gz"
-// 	} else {
-// 		link = "https://go.dev/dl/go" + golangVersion + ".linux-amd64.tar.gz"
-// 	}
-// 	resp, err := http.Get(link)
-// 	if err != nil {
-// 		return fmt.Errorf("fehler beim Herunterladen von Go: %v", err)
-// 	}
-// 	defer resp.Body.Close()
-
-// 	if resp.StatusCode != http.StatusOK {
-// 		return fmt.Errorf("unerwarteter HTTP-Status: %s", resp.Status)
-// 	}
-
-// 	outFile, err := os.Create("go" + golangVersion + ".linux-" + runtime.GOARCH + ".tar.gz")
-// 	if err != nil {
-// 		return fmt.Errorf("fehler beim Erstellen der Ausgabedatei: %v", err)
-// 	}
-// 	defer outFile.Close()
-
-// 	_, err = io.Copy(outFile, resp.Body)
-// 	if err != nil {
-// 		return fmt.Errorf("fehler beim Schreiben der Ausgabedatei: %v", err)
-// 	}
-
-// 	return nil
-// }
-
 func max(a, b int) int {
 	if a > b {
 		return a
@@ -69,18 +40,8 @@ func max(a, b int) int {
 	return b
 }
 
-// func installPackageWithProgress(name string, installFunc func() error) error {
-// 	err := installFunc()
-// 	if err != nil {
-// 		fmt.Printf("\r❌ %s\n", name)
-// 		return err
-// 	}
-// 	fmt.Printf("\r✓ %s\n", name)
-// 	return nil
-// }
-
 func executeShellCommand(command string, env string) error {
-	cmd := exec.Command("bash", "-c", command)
+	cmd := execCommand("bash", "-c", command)
 	cmd.Env = os.Environ()
 	cmd.Env = append(cmd.Env, env)
 	output, err := cmd.CombinedOutput()
diff --git a/utils_test.go b/utils_test.go
new file mode 100644
index 0000000..20dcde6
--- /dev/null
+++ b/utils_test.go
@@ -0,0 +1,78 @@
+package main
+
+import (
+	"os/exec"
+	"testing"
+)
+
+func TestMax(t *testing.T) {
+	tests := []struct {
+		a, b, want int
+	}{
+		{1, 2, 2},
+		{5, 3, 5},
+		{0, 0, 0},
+		{-1, -5, -1},
+	}
+
+	for _, tt := range tests {
+		got := max(tt.a, tt.b)
+		if got != tt.want {
+			t.Errorf("max(%d, %d) = %d; want %d", tt.a, tt.b, got, tt.want)
+		}
+	}
+}
+
+func TestExecuteShellCommand(t *testing.T) {
+	// Mock execCommand
+	oldExecCommand := execCommand
+	defer func() { execCommand = oldExecCommand }()
+
+	execCommand = func(command string, args ...string) *exec.Cmd {
+		return exec.Command("echo", "mocked command")
+	}
+
+	err := executeShellCommand("test command", "TEST_ENV=value")
+	if err != nil {
+		t.Errorf("executeShellCommand() error = %v; want nil", err)
+	}
+}
+
+func TestInstallWithProgress(t *testing.T) {
+	mockManager := &MockPackageManager{
+		packages: []string{"pkg1", "pkg2"},
+	}
+
+	err := installWithProgress(mockManager, mockManager.packages)
+	if err != nil {
+		t.Errorf("installWithProgress() error = %v; want nil", err)
+	}
+
+	if len(mockManager.installedPackages) != len(mockManager.packages) {
+		t.Errorf("installWithProgress() installed %d packages; want %d", len(mockManager.installedPackages), len(mockManager.packages))
+	}
+}
+
+// MockPackageManager implementiert das PackageManager Interface für Tests
+type MockPackageManager struct {
+	packages          []string
+	installedPackages []string
+}
+
+func (m *MockPackageManager) Install(packages []string) error {
+	m.installedPackages = append(m.installedPackages, packages...)
+	return nil
+}
+
+func (m *MockPackageManager) InstallPackage(pkg string) error {
+	m.installedPackages = append(m.installedPackages, pkg)
+	return nil
+}
+
+func (m *MockPackageManager) InstallManager() error {
+	return nil
+}
+
+func (m *MockPackageManager) Name() string {
+	return "MockManager"
+}