1 files changed, 30 insertions, 0 deletions
diff --git a/internal/api/google_calendar_test.go b/internal/api/google_calendar_test.go
index 3cf0dbd..efbab0d 100644
--- a/internal/api/google_calendar_test.go
+++ b/internal/api/google_calendar_test.go
@@ -272,3 +272,33 @@ func TestGetUpcomingEvents_APIError_ReturnsEmptyNotError(t *testing.T) {
 		t.Errorf("expected 0 events on API error, got %d", len(events))
 	}
 }
+
+// --- formatRecurrence ---
+
+func TestFormatRecurrence(t *testing.T) {
+	tests := []struct {
+		name  string
+		rules []string
+		want  string
+	}{
+		{"weekly single day", []string{"RRULE:FREQ=WEEKLY;BYDAY=MO"}, "Repeats weekly on Monday"},
+		{"weekly multiple days", []string{"RRULE:FREQ=WEEKLY;BYDAY=MO,WE,FR"}, "Repeats weekly on Monday, Wednesday, Friday"},
+		{"daily", []string{"RRULE:FREQ=DAILY"}, "Repeats daily"},
+		{"monthly", []string{"RRULE:FREQ=MONTHLY"}, "Repeats monthly"},
+		{"yearly", []string{"RRULE:FREQ=YEARLY"}, "Repeats yearly"},
+		{"interval weekly", []string{"RRULE:FREQ=WEEKLY;INTERVAL=2;BYDAY=SU"}, "Repeats every 2 weeks on Sunday"},
+		{"interval daily", []string{"RRULE:FREQ=DAILY;INTERVAL=3"}, "Repeats every 3 days"},
+		{"unrecognized frequency", []string{"RRULE:FREQ=HOURLY"}, "Recurring event"},
+		{"empty", []string{}, "Recurring event"},
+		{"unparseable", []string{"not a valid rule"}, "Recurring event"},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			got := formatRecurrence(tc.rules)
+			if got != tc.want {
+				t.Errorf("formatRecurrence(%v) = %q, want %q", tc.rules, got, tc.want)
+			}
+		})
+	}
+}