# Custom attrmap specifications -------------------------------------------

test_that("'na' vertex attribute can be dropped when going network->igraph", {
  net <- asNetwork(exIgraph)
  a <- attrmap()
  r <- data.frame(
    type="vertex", 
    fromcls="network",
    fromattr="na",
    tocls="igraph", 
    toattr=NA,
    stringsAsFactors=FALSE
  )
  aa <- rbind(a, r)
  g <- asIgraph(net, amap=aa)
  expect_false( "na" %in% igraph::vertex_attr_names(g))
} )