feat(calfeed): shared day builder + reusable reading resolver

1 files changed, 46 insertions, 0 deletions

diff --git a/internal/calfeed/build_test.go b/internal/calfeed/build_test.go
new file mode 100644
index 0000000..333a51b
--- /dev/null
+++ b/internal/calfeed/build_test.go
@@ -0,0 +1,46 @@
+package calfeed
+
+import (
+	"testing"
+	"time"
+
+	"github.com/lukaszkasprzak/lectio/internal/caldata"
+	"github.com/lukaszkasprzak/lectio/internal/calendar"
+)
+
+func TestBuildThreeDayRange(t *testing.T) {
+	sel := calendar.DefaultSelection()
+	sel.Form = "old"
+	layers := []calendar.Layer{caldata.Tridentine()}
+
+	from := time.Date(2026, 1, 5, 0, 0, 0, 0, time.UTC)
+	to := time.Date(2026, 1, 7, 0, 0, 0, 0, time.UTC)
+	days := Build(from, to, "en", sel, layers, func(date time.Time, day calendar.LiturgicalDay) []calendar.Reading {
+		return caldata.Readings(sel, layers, date, day)
+	})
+
+	if len(days) != 3 {
+		t.Fatalf("len(days) = %d, want 3", len(days))
+	}
+
+	wantDates := []string{"2026-01-05", "2026-01-06", "2026-01-07"}
+	seenWeekday := false
+	feastFound := false
+	for i, d := range days {
+		if d.Date != wantDates[i] {
+			t.Errorf("day %d: date = %q, want %q", i, d.Date, wantDates[i])
+		}
+		if d.Weekday != "" {
+			seenWeekday = true
+		}
+		if d.Date == "2026-01-06" && d.Observed.Name != "" {
+			feastFound = true
+		}
+	}
+	if !seenWeekday {
+		t.Errorf("expected weekday strings to be set: %+v", days)
+	}
+	if !feastFound {
+		t.Errorf("expected Epiphany (2026-01-06) to have a non-empty Observed.Name: %+v", days)
+	}
+}