channeldb/graph test: add test for update policy for unknown edge

channeldb/graph_test.go

@@ -729,6 +729,14 @@ func TestEdgeInfoUpdates(t *testing.T) {
 
 	// Create an edge and add it to the db.
 	edgeInfo, edge1, edge2 := createChannelEdge(db, node1, node2)
+
+	// Make sure inserting the policy at this point, before the edge info
+	// is added, will fail.
+	if err := graph.UpdateEdgePolicy(edge1); err != ErrEdgeNotFound {
+		t.Fatalf("expected ErrEdgeNotFound, got: %v", err)
+	}
+
+	// Add the edge info.
 	if err := graph.AddChannelEdge(edgeInfo); err != nil {
 		t.Fatalf("unable to create channel edge: %v", err)
 	}