test_that(".DollarNames retrieves inherited methods", {
A <- ggproto("A", NULL, a = 1)
B <- ggproto("B", A, b = 2)
expect_equal(.DollarNames(B), c("b", "a"))
})
test_that("construction checks input", {
expect_snapshot_error(ggproto("Test", NULL, function(self, a) a))
expect_snapshot_error(ggproto("Test", NULL, a <- function(self, a) a))
expect_snapshot_error(ggproto("Test", mtcars, a = function(self, a) a))
})
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