display name: csv(String, String) / [1] a="x" b=null -> SUCCESSFUL
display name: csv(String, String) / [2] a=null b="y" -> SUCCESSFUL
display name: csv(String, String) / [3] a="" b="z" -> SUCCESSFUL
display name: csv(String, String) / [4] a=null b="w" -> SUCCESSFUL
display name: csv(String, String) / [5] a="a,b" b="q" -> SUCCESSFUL
--- values the test method received ---
a="x"  b=null
a=null  b="y"
a=""  b="z"
a=null  b="w"
a="a,b"  b="q"