start fixing ggplot2 examples that are broken in dev version

Author: cpsievert

tests/testthat/test-ggplot-device.R

@@ -2,7 +2,7 @@ context("device")
 
 test_that("ggplotly doesn't leave a new device open", {
   devList1 <- dev.list()
-  p <- ggplotly(qplot(1:10))
+  p <- ggplotly(ggplot(mtcars) + geom_point(aes(wt, mpg)))
   devList2 <- dev.list()
   expect_true(length(devList1) == length(devList2))
 })