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context("Layer")
# Parameters --------------------------------------------------------------
test_that("aesthetics go in aes_params", {
l <- geom_point(size = "red")
expect_equal(l$aes_params, list(size = "red"))
})
test_that("unknown params create warning", {
expect_warning(geom_point(blah = "red"), "unknown parameters")
})
test_that("unknown aesthietcs create warning", {
expect_warning(geom_point(aes(blah = "red")), "unknown aesthetics")
})
test_that("unknown NULL asthetic doesn't create warning (#1909)", {
expect_warning(geom_point(aes(blah = NULL)), NA)
})
test_that("column vectors are allowed (#2609)", {
df <- data_frame(x = 1:10)
df$y <- scale(1:10) # Returns a column vector
p <- ggplot(df, aes(x, y))
expect_is(layer_data(p), "data.frame")
})
test_that("missing aesthetics trigger informative error", {
df <- data_frame(x = 1:10)
expect_error(
ggplot_build(ggplot(df) + geom_line()),
"requires the following missing aesthetics:"
)
expect_error(
ggplot_build(ggplot(df) + geom_col()),
"requires the following missing aesthetics:"
)
})
test_that("function aesthetics are wrapped with stat()", {
df <- data_frame(x = 1:10)
expect_error(
ggplot_build(ggplot(df, aes(colour = density, fill = density)) + geom_point()),
"Aesthetics must be valid data columns. Problematic aesthetic(s): colour = density, fill = density",
fixed = TRUE
)
})
test_that("computed stats are in appropriate layer", {
df <- data_frame(x = 1:10)
expect_error(
ggplot_build(ggplot(df, aes(colour = stat(density), fill = stat(density))) + geom_point()),
"Aesthetics must be valid computed stats. Problematic aesthetic(s): colour = stat(density), fill = stat(density)",
fixed = TRUE
)
})
test_that("if an aes is mapped to a function that returns NULL, it is removed", {
df <- data_frame(x = 1:10)
null <- function(...) NULL
p <- cdata(ggplot(df, aes(x, null())))
expect_identical(names(p[[1]]), c("x", "PANEL", "group"))
})
# Data extraction ---------------------------------------------------------
test_that("layer_data returns a data.frame", {
l <- geom_point()
expect_equal(l$layer_data(mtcars), mtcars)
l <- geom_point(data = head(mtcars))
expect_equal(l$layer_data(mtcars), head(mtcars))
l <- geom_point(data = head)
expect_equal(l$layer_data(mtcars), head(mtcars))
l <- geom_point(data = ~ head(., 10))
expect_equal(l$layer_data(mtcars), head(mtcars, 10))
l <- geom_point(data = nrow)
expect_error(l$layer_data(mtcars), "Data function must return a data.frame")
})
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