1 files changed, 45 insertions, 0 deletions
diff --git a/internal/readings/partids_test.go b/internal/readings/partids_test.go
index 68f5ec0..1ba9373 100644
--- a/internal/readings/partids_test.go
+++ b/internal/readings/partids_test.go
@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"github.com/lukaszkasprzak/lectio/internal/config"
+	"github.com/lukaszkasprzak/lectio/internal/i18n"
 )
 
 // The day header must carry the rank, not just name and colour: the app's
@@ -28,3 +29,47 @@ func TestDayInfoCarriesRank(t *testing.T) {
 		}
 	}
 }
+
+// PartIDs must list exactly the IDs the engine can emit, in display order.
+// The app derives its "show readings" checkboxes from this; when it hardcoded
+// them instead, seven of the nine 1962 IDs were wrong and the epistle's
+// checkbox did nothing.
+func TestPartIDs(t *testing.T) {
+	wantNew := []string{"pierwsze_czytanie", "psalm", "drugie_czytanie", "aklamacja", "ewangelia"}
+	wantOld := []string{"epistola", "evangelium"}
+	if got := PartIDs("new"); !equalSlice(got, wantNew) {
+		t.Errorf("PartIDs(new) = %v, want %v", got, wantNew)
+	}
+	if got := PartIDs("traditional"); !equalSlice(got, wantOld) {
+		t.Errorf("PartIDs(traditional) = %v, want %v", got, wantOld)
+	}
+	if got := PartIDs("nonsense"); len(got) != 0 {
+		t.Errorf("PartIDs(nonsense) = %v, want empty", got)
+	}
+}
+
+// Every ID PartIDs lists must have a label in every shipped language,
+// otherwise a checkbox would render a raw ID like "epistola".
+func TestEveryPartIDHasLabels(t *testing.T) {
+	for _, lect := range []string{"new", "traditional"} {
+		for _, id := range PartIDs(lect) {
+			for _, lang := range []string{"en", "pl"} {
+				if i18n.Get(lang).PartLabel[id] == "" {
+					t.Errorf("%s/%s: no label for %q", lect, lang, id)
+				}
+			}
+		}
+	}
+}
+
+func equalSlice(a, b []string) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i := range a {
+		if a[i] != b[i] {
+			return false
+		}
+	}
+	return true
+}