test failure due to the API change from labs() in ggplot3.1.0

[mikejiang]

In ggplot2 3.0.0 , labs used to be able to take a name list as programmatic way of setting axis labels, e.g.

> labs(list(x = "FSC"))
$x
[1] "FSC"

attr(,"class")
[1] "labels"

which is equivalent to

> labs(x = "FSC")
$x
[1] "FSC"

attr(,"class")
[1] "labels"

But now it won't work properly

> labs(list(x = "FSC"))
[[1]]
[[1]]$x
[1] "FSC"


attr(,"class")
[1] "labels"

unless apply the tidyverse evaluation

> labs(!!!list(x = "FSC"))
$x
[1] "FSC"

attr(,"class")
[1] "labels"

reference issue
tidyverse/ggplot2#2669 (comment)