diff --git a/main_test.go b/main_test.go
new file mode 100644
index 0000000..5b5f8a7
--- /dev/null
+++ b/main_test.go
@@ -0,0 +1,51 @@
+package main
+
+import (
+	"bytes"
+	"os/exec"
+	"strings"
+	"testing"
+)
+
+func TestOpenPopup(t *testing.T) {
+	// Mock tmux command for testing
+	cmd := exec.Command("echo", "mock_session")
+	output, err := cmd.Output()
+	if err != nil {
+		t.Fatalf("Failed to mock tmux command: %v", err)
+	}
+
+	currentSession := strings.TrimSpace(string(output))
+	if currentSession != "mock_session" {
+		t.Errorf("Expected mock_session, got %s", currentSession)
+	}
+}
+
+func TestCheckDependencies(t *testing.T) {
+	// Create a mock dependency list for testing
+	mockDeps := []string{"echo", "ls"}
+
+	for _, dep := range mockDeps {
+		cmd := exec.Command(dep, "--version")
+		err := cmd.Run()
+		if err != nil {
+			t.Errorf("Dependency %s check failed: %v", dep, err)
+		}
+	}
+}
+
+func TestRunCmd(t *testing.T) {
+	var stdout, stderr bytes.Buffer
+	cmd := exec.Command("echo", "Hello, World!")
+	cmd.Stdout = &stdout
+	cmd.Stderr = &stderr
+
+	err := cmd.Run()
+	if err != nil {
+		t.Fatalf("runCmd failed: %v", err)
+	}
+
+	if stdout.String() != "Hello, World!\n" {
+		t.Errorf("Expected 'Hello, World!', got %s", stdout.String())
+	}
+}