WIP: Add tests

README.md

@@ -1 +1,6 @@
 # RoutheOS API
+
+## 🐛 Testing
+
+The project can be testing with the command:
+> go test -v ./...

model/message_test.go

@@ -0,0 +1,50 @@
+package model
+
+import "testing"
+
+func TestMessage_GetHostname(t *testing.T) {
+	m := Message{Hostname: "vm-ABC-123", IpAddress: "10.0.0.1"}
+
+	if m.Hostname != "vm-ABC-123" {
+		t.Fatalf("expected hostname to be %q, got %q", "vm-ABC-123", m.Hostname)
+	}
+
+	// Ensure calling GetSerial does not mutate Hostname
+	_ = m.GetSerial()
+	if m.Hostname != "vm-ABC-123" {
+		t.Fatalf("hostname was mutated by GetSerial: got %q", m.Hostname)
+	}
+}
+
+func TestMessage_GetSerial(t *testing.T) {
+	tests := []struct {
+		name     string
+		hostname string
+		want     string
+	}{
+		{"no_dash", "vm", ""},
+		{"single_dash", "vm-12345", "12345"},
+		{"multi_dash", "vm-123-456", "123-456"},
+		{"leading_dash", "-SERIAL", "SERIAL"},
+		{"empty_hostname", "", ""},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			m := Message{Hostname: tt.hostname}
+			got := m.GetSerial()
+			if got != tt.want {
+				t.Fatalf("GetSerial() for hostname %q = %q, want %q", tt.hostname, got, tt.want)
+			}
+
+			// Ensure result is cached in m.serial after first call, but only when non-empty
+			original := got
+			m.Hostname = "vm-CHANGED-999"
+			if original != "" {
+				if cached := m.GetSerial(); cached != original {
+					t.Fatalf("expected cached serial %q after hostname change, got %q", original, cached)
+				}
+			}
+		})
+	}
+}

model/virtualmachine_test.go

@@ -0,0 +1,32 @@
+package model
+
+import "testing"
+
+func TestVirtualMachine_NewVM(t *testing.T) {
+	netbox := &Netbox{}
+	msg := Message{
+		Hostname: "vm-12345",
+	}
+
+	vm := NewVM(netbox, msg)
+	if vm.Serial != "12345" {
+		t.Fatalf("expected serial to be %q, got %q", "12345", vm.Serial)
+	}
+
+}
+
+func TestVirtualMachine_Exists(t *testing.T) {
+	// When VM has no Netbox client and no NetboxId, Exists should early-return (false, 0, nil)
+	vm := &VirtualMachine{}
+
+	exists, id, err := vm.Exists("some-host", "some-serial")
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+	if exists {
+		t.Fatalf("expected exists to be false, got true")
+	}
+	if id != 0 {
+		t.Fatalf("expected id to be 0, got %d", id)
+	}
+}