feat(calendar): DateSpec resolution (fixed + easter/christmas offsets + sunday-after)

1 files changed, 24 insertions, 0 deletions

diff --git a/internal/calendar/datespec_test.go b/internal/calendar/datespec_test.go
new file mode 100644
index 0000000..e5e34c0
--- /dev/null
+++ b/internal/calendar/datespec_test.go
@@ -0,0 +1,24 @@
+package calendar
+
+import (
+	"testing"
+)
+
+func TestResolveDate(t *testing.T) {
+	y := 2025
+	e := Easter(y) // 2025-04-20
+	check := func(spec, want string) {
+		got, ok := resolveDate(DateSpec(spec), y, e)
+		if !ok || got.Format("2006-01-02") != want {
+			t.Errorf("resolveDate(%q) = %s ok=%v, want %s", spec, got.Format("2006-01-02"), ok, want)
+		}
+	}
+	check("08-15", "2025-08-15")     // fixed
+	check("easter+60", "2025-06-19") // Corpus Christi (Thursday)
+	check("easter-46", "2025-03-05") // Ash Wednesday
+	check("christmas+7", "2026-01-01")
+	check("sunday-after 01-06", "2025-01-12")
+	if _, ok := resolveDate("garbage", y, e); ok {
+		t.Error("garbage should not resolve")
+	}
+}