✅(front,back) add tests for visio conference feature

- Frontend: 3 unit tests for generateVisioRoomId (format, length,
  uniqueness)
- Backend: 7 tests for ICalendarParser URL extraction and email
  template rendering with/without visio URL

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/backend/core/tests/test_calendar_invitation_service.py

@@ -0,0 +1,100 @@
+"""Tests for ICalendarParser and email template rendering."""
+
+from django.template.loader import render_to_string
+
+import pytest
+
+from core.services.calendar_invitation_service import (
+    CalendarInvitationService,
+    ICalendarParser,
+)
+
+# Sample ICS with URL property
+ICS_WITH_URL = """BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//Test//EN
+BEGIN:VEVENT
+UID:test-123
+DTSTART:20260210T140000Z
+DTEND:20260210T150000Z
+SUMMARY:Réunion d'équipe
+DESCRIPTION:Point hebdomadaire
+LOCATION:Salle 301
+URL:https://visio.numerique.gouv.fr/abc-defg-hij
+ORGANIZER;CN=Alice:mailto:alice@example.com
+ATTENDEE;CN=Bob;RSVP=TRUE:mailto:bob@example.com
+SEQUENCE:0
+END:VEVENT
+END:VCALENDAR"""
+
+# Sample ICS without URL property
+ICS_WITHOUT_URL = """BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//Test//EN
+BEGIN:VEVENT
+UID:test-456
+DTSTART:20260210T140000Z
+DTEND:20260210T150000Z
+SUMMARY:Simple meeting
+ORGANIZER;CN=Alice:mailto:alice@example.com
+ATTENDEE;CN=Bob;RSVP=TRUE:mailto:bob@example.com
+SEQUENCE:0
+END:VEVENT
+END:VCALENDAR"""
+
+
+class TestICalendarParserUrl:
+    """Tests for URL property extraction in ICalendarParser."""
+
+    def test_parse_extracts_url_when_present(self):
+        event = ICalendarParser.parse(ICS_WITH_URL, "bob@example.com")
+        assert event is not None
+        assert event.url == "https://visio.numerique.gouv.fr/abc-defg-hij"
+
+    def test_parse_url_is_none_when_absent(self):
+        event = ICalendarParser.parse(ICS_WITHOUT_URL, "bob@example.com")
+        assert event is not None
+        assert event.url is None
+
+    def test_parse_preserves_other_fields_with_url(self):
+        event = ICalendarParser.parse(ICS_WITH_URL, "bob@example.com")
+        assert event is not None
+        assert event.summary == "Réunion d'équipe"
+        assert event.description == "Point hebdomadaire"
+        assert event.location == "Salle 301"
+        assert event.organizer_email == "alice@example.com"
+
+
+@pytest.mark.django_db
+class TestEmailTemplateVisioUrl:
+    """Tests for visio URL rendering in email templates."""
+
+    def _build_context(self, event):
+        service = CalendarInvitationService()
+        return service._build_template_context(event, "REQUEST")
+
+    def test_invitation_html_contains_visio_link(self):
+        event = ICalendarParser.parse(ICS_WITH_URL, "bob@example.com")
+        context = self._build_context(event)
+        html = render_to_string("emails/calendar_invitation.html", context)
+        assert "https://visio.numerique.gouv.fr/abc-defg-hij" in html
+        assert "Visio" in html
+
+    def test_invitation_txt_contains_visio_link(self):
+        event = ICalendarParser.parse(ICS_WITH_URL, "bob@example.com")
+        context = self._build_context(event)
+        txt = render_to_string("emails/calendar_invitation.txt", context)
+        assert "https://visio.numerique.gouv.fr/abc-defg-hij" in txt
+        assert "Visio" in txt
+
+    def test_invitation_html_no_visio_when_absent(self):
+        event = ICalendarParser.parse(ICS_WITHOUT_URL, "bob@example.com")
+        context = self._build_context(event)
+        html = render_to_string("emails/calendar_invitation.html", context)
+        assert "Visio" not in html
+
+    def test_invitation_txt_no_visio_when_absent(self):
+        event = ICalendarParser.parse(ICS_WITHOUT_URL, "bob@example.com")
+        context = self._build_context(event)
+        txt = render_to_string("emails/calendar_invitation.txt", context)
+        assert "Visio" not in txt

src/frontend/apps/calendars/src/features/calendar/components/scheduler/event-modal-sections/__tests__/generateVisioRoomId.test.ts

@@ -0,0 +1,20 @@
+import { generateVisioRoomId } from "../generateVisioRoomId";
+
+describe("generateVisioRoomId", () => {
+  it("returns a string matching the xxx-xxxx-xxx format", () => {
+    const id = generateVisioRoomId();
+    expect(id).toMatch(/^[a-z]{3}-[a-z]{4}-[a-z]{3}$/);
+  });
+
+  it("generates different IDs on subsequent calls", () => {
+    const ids = new Set(
+      Array.from({ length: 20 }, () => generateVisioRoomId()),
+    );
+    expect(ids.size).toBeGreaterThan(1);
+  });
+
+  it("has exactly 12 characters (3 + 1 + 4 + 1 + 3)", () => {
+    const id = generateVisioRoomId();
+    expect(id.length).toBe(12);
+  });
+});