feat(calendar): temporal cycle (seasons, Sundays, movable solemnities)

1 files changed, 53 insertions, 0 deletions

diff --git a/internal/calendar/temporal_test.go b/internal/calendar/temporal_test.go
new file mode 100644
index 0000000..da871a2
--- /dev/null
+++ b/internal/calendar/temporal_test.go
@@ -0,0 +1,53 @@
+package calendar
+
+import (
+	"testing"
+	"time"
+)
+
+func d(s string) time.Time {
+	t, _ := time.Parse("2006-01-02", s)
+	return t.UTC()
+}
+
+func TestTemporalSeasons(t *testing.T) {
+	sel := DefaultSelection()
+	cases := []struct {
+		date   string
+		season Season
+	}{
+		{"2025-12-01", Advent},    // Mon after Advent I (2025 Advent I = Nov 30)
+		{"2025-12-25", Christmas}, // Christmas
+		{"2025-03-05", Lent},      // Ash Wednesday 2025
+		{"2025-04-20", Easter_},   // Easter Sunday 2025
+		{"2025-07-15", Ordinary},  // deep Ordinary Time
+	}
+	for _, c := range cases {
+		got := temporal(d(c.date), sel)
+		if got.Season != c.season {
+			t.Errorf("temporal(%s).Season = %s, want %s", c.date, got.Season, c.season)
+		}
+	}
+}
+
+func TestTemporalPrivilegedSunday(t *testing.T) {
+	// 2nd Sunday of Advent 2025 (Dec 7) is privileged and violet.
+	td := temporal(d("2025-12-07"), DefaultSelection())
+	if !td.Privileged {
+		t.Error("Sunday of Advent must be privileged")
+	}
+	if td.Colour != Violet {
+		t.Errorf("Advent colour = %s want violet", td.Colour)
+	}
+}
+
+func TestMovableSolemnities(t *testing.T) {
+	// Corpus Christi 2025 (Thursday, easter+60) = 2025-06-19.
+	td := temporal(d("2025-06-19"), DefaultSelection())
+	if td.Cel.Slug != "corpus-christi" {
+		t.Errorf("2025-06-19 temporal slug = %q want corpus-christi", td.Cel.Slug)
+	}
+	if td.Rank != RankSolemnity {
+		t.Error("Corpus Christi must be a solemnity")
+	}
+}