val val  "image^from^image^attribute^directory^should^be^displayed" val_val
val inv "image^from^image^attribute^directory^should^be^displayed" val_inv
val nul "image^from^image^attribute^directory^should^be^displayed" val_nul
inv val "no^image^should^be^displayed" inv_val
inv inv "no^image^should^be^displayed" inv_inv
inv nul "no^image^should^be^displayed" inv_nul
nul val "image^from^imagepath^attribute^directory^or^working^directory^should^be^displayed" nul_val
nul inv "no^image^for^Graphviz.app,^else^image^from^working^directory" nul_inv
nul nul "image^in^working^directory^should^be^displayed" nul_nul

