backend: support external SPARQL and named-graph snapshots

backend_go/sparql_named_graph_test.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestNamedGraphAnyTripleAskQueryUsesGraphVariable(t *testing.T) {
+	query := namedGraphAnyTripleAskQuery()
+
+	if !strings.Contains(query, "ASK WHERE") {
+		t.Fatalf("readiness query should be an ASK query:\n%s", query)
+	}
+	if !strings.Contains(query, "GRAPH ?g") {
+		t.Fatalf("readiness query should probe named graphs:\n%s", query)
+	}
+	if strings.Contains(query, "ASK WHERE { ?s ?p ?o }") {
+		t.Fatalf("readiness query should no longer probe only the default graph:\n%s", query)
+	}
+}