generate vCard in utils.py; added Tests

tests/test_utils_vcard.py

@@ -0,0 +1,29 @@
+from types import SimpleNamespace
+from pathlib import Path
+
+from utils import generate_vcard
+
+
+def test_generate_vcard_writes_file(tmp_path):
+    addr = SimpleNamespace(
+        vorname='Anna',
+        nachname='Muster',
+        strasse='Beispielweg',
+        hausnummer='5a',
+        plz='54321',
+        ort='Beispielstadt',
+        land='Deutschland',
+        email='anna@example.com',
+        telefon_vorwahl='49',
+        telefon_nummer='7654321',
+        id=42,
+    )
+
+    path = generate_vcard(addr, str(tmp_path))
+    assert Path(path).exists()
+
+    content = Path(path).read_text(encoding='utf-8')
+    assert 'BEGIN:VCARD' in content
+    assert 'FN:Anna Muster' in content
+    assert 'EMAIL;TYPE=internet:anna@example.com' in content
+    assert 'TEL;TYPE=voice:+497654321' in content