1 files changed, 48 insertions, 0 deletions
diff --git a/internal/caldata/caldata_test.go b/internal/caldata/caldata_test.go
index 95bb7dc..f993a12 100644
--- a/internal/caldata/caldata_test.go
+++ b/internal/caldata/caldata_test.go
@@ -5,6 +5,7 @@ import (
 	"testing"
 
 	"github.com/lukaszkasprzak/lectio/internal/calendar"
+	"time"
 )
 
 func TestUniversalLoads(t *testing.T) {
@@ -473,3 +474,50 @@ func TestTridentineMissalOverrides(t *testing.T) {
 		}
 	}
 }
+
+// TestEFBVMSaturdayReadings pins RG 309(a)'s seasonal selection among the five
+// Missae de sancta Maria in sabbato. Without it the day was kept as Our Lady's
+// office (RG 78) but read the FERIA's Mass -- so a Saturday in Septuagesima
+// announced Our Lady and then read the parable of the labourers.
+//
+// Citations verified by colitur against both photographic scans of the 1962
+// Missal; see its lectionary_ef.ml for the per-formulary scan references.
+func TestEFBVMSaturdayReadings(t *testing.T) {
+	sel := calendar.Selection{Form: "old"}
+	for _, c := range []struct{ date, first string }{
+		{"2026-01-03", "Titus 3:4-7"},     // Christmas Time
+		{"2026-01-10", "Titus 3:4-7"},     // still Christmas Time
+		{"2026-02-14", "Ecclus 24:14-16"}, // after the Purification
+		{"2026-06-20", "Ecclus 24:14-16"}, // Time after Pentecost
+		{"2026-04-18", "Ecclus 24:14-16"}, // Paschaltide -- same first, DIFFERENT gospel
+	} {
+		day, _ := time.Parse("2006-01-02", c.date)
+		layers := []calendar.Layer{Tridentine()}
+		ld := calendar.Compute(day, sel, layers)
+		got := Readings(sel, layers, day, ld)
+		if len(got) == 0 || got[0].Citation != c.first {
+			first := "(none)"
+			if len(got) > 0 {
+				first = got[0].Citation
+			}
+			t.Errorf("%s: first reading = %q, want %q (RG 309(a), the Mass of Our Lady on Saturday)",
+				c.date, first, c.first)
+		}
+	}
+	// Paschaltide shares its first reading with the rest of the year but has
+	// its own gospel -- St John at the Cross rather than the woman in the
+	// crowd. Asserted separately because a first-reading-only test would pass
+	// with the wrong gospel.
+	day, _ := time.Parse("2006-01-02", "2026-04-18")
+	layers := []calendar.Layer{Tridentine()}
+	got := Readings(sel, layers, day, calendar.Compute(day, sel, layers))
+	var gospel string
+	for _, r := range got {
+		if r.Part == "gospel" {
+			gospel = r.Citation
+		}
+	}
+	if gospel != "John 19:25-27" {
+		t.Errorf("2026-04-18: gospel = %q, want %q (the Paschaltide formulary)", gospel, "John 19:25-27")
+	}
+}