add: mockSMTP Server for testing; getUser func

internal/utils/mock_smtp.go

@@ -0,0 +1,33 @@
+package utils
+
+import (
+	smtpmock "github.com/mocktools/go-smtp-mock/v2"
+)
+
+var Server smtpmock.Server
+
+// StartMockSMTPServer starts a mock SMTP server for testing
+func SMTPStart(host string, port int) error {
+	Server = *smtpmock.New(smtpmock.ConfigurationAttr{
+		HostAddress:       host,
+		PortNumber:        port,
+		LogToStdout:       false,
+		LogServerActivity: false,
+	})
+	if err := Server.Start(); err != nil {
+		return err
+	}
+	return nil
+}
+
+func SMTPGetMessages() []smtpmock.Message {
+	return Server.MessagesAndPurge()
+}
+
+func SMTPStop() error {
+
+	if err := Server.Stop(); err != nil {
+		return err
+	}
+	return nil
+}