Split dns.go in one file per check

pkg/analyzer/dns_dkim_test.go

@@ -0,0 +1,72 @@
+// This file is part of the happyDeliver (R) project.
+// Copyright (c) 2025 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package analyzer
+
+import (
+	"testing"
+	"time"
+)
+
+func TestValidateDKIM(t *testing.T) {
+	tests := []struct {
+		name     string
+		record   string
+		expected bool
+	}{
+		{
+			name:     "Valid DKIM with version",
+			record:   "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQ...",
+			expected: true,
+		},
+		{
+			name:     "Valid DKIM without version",
+			record:   "k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQ...",
+			expected: true,
+		},
+		{
+			name:     "Invalid DKIM - no public key",
+			record:   "v=DKIM1; k=rsa",
+			expected: false,
+		},
+		{
+			name:     "Invalid DKIM - wrong version",
+			record:   "v=DKIM2; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQ...",
+			expected: false,
+		},
+		{
+			name:     "Invalid DKIM - empty",
+			record:   "",
+			expected: false,
+		},
+	}
+
+	analyzer := NewDNSAnalyzer(5 * time.Second)
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := analyzer.validateDKIM(tt.record)
+			if result != tt.expected {
+				t.Errorf("validateDKIM(%q) = %v, want %v", tt.record, result, tt.expected)
+			}
+		})
+	}
+}