backend: support external SPARQL and named-graph snapshots

backend_go/graph_export_test.go

@@ -0,0 +1,24 @@
+package main
+
+import "testing"
+
+func TestGraphAccumulatorDeduplicatesEdges(t *testing.T) {
+	preds := NewPredicateDict([]string{"http://example.com/p"})
+	acc := newGraphAccumulator(16, false, 16, preds)
+
+	binding := sparqlTripleBinding{
+		S: sparqlTerm{Type: "uri", Value: "http://example.com/s"},
+		P: sparqlTerm{Type: "uri", Value: "http://example.com/p"},
+		O: sparqlTerm{Type: "uri", Value: "http://example.com/o"},
+	}
+
+	acc.addTripleBinding(binding)
+	acc.addTripleBinding(binding)
+
+	if len(acc.nodes) != 2 {
+		t.Fatalf("expected 2 nodes after duplicate bindings, got %d", len(acc.nodes))
+	}
+	if len(acc.edges) != 1 {
+		t.Fatalf("expected 1 deduplicated edge, got %d", len(acc.edges))
+	}
+}