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a <- data_frame(a = c(1, 1, 2, 2), b = c(1, 2, 1, 1))
b <- data_frame(a = 3)
c <- data_frame(b = 3)
empty <- data_frame()
panel_layout <- function(facet, data) {
layout <- create_layout(facet)
layout$setup(data)
layout$layout
}
test_that("grid: single row and single col are equivalent", {
row <- panel_layout(facet_grid(a~.), list(a))
col <- panel_layout(facet_grid(.~a), list(a))
expect_equal(row$ROW, 1:2)
expect_equal(row$ROW, col$COL)
expect_equal(row[c("PANEL", "a")], col[c("PANEL", "a")])
row <- panel_layout(facet_grid(a~.), list(a, b))
col <- panel_layout(facet_grid(.~a), list(a, b))
expect_equal(row$ROW, 1:3)
expect_equal(row$ROW, col$COL)
expect_equal(row[c("PANEL", "a")], col[c("PANEL", "a")])
})
test_that("grid: includes all combinations", {
d <- data_frame(a = c(1, 2), b = c(2, 1))
all <- panel_layout(facet_grid(a~b), list(d))
expect_equal(nrow(all), 4)
})
test_that("wrap and grid are equivalent for 1d data", {
rowg <- panel_layout(facet_grid(a~.), list(a))
roww <- panel_layout(facet_wrap(~a, ncol = 1), list(a))
expect_equal(roww, rowg)
colg <- panel_layout(facet_grid(.~a), list(a))
colw <- panel_layout(facet_wrap(~a, nrow = 1), list(a))
expect_equal(colw, colg)
})
test_that("grid: crossed rows/cols create no more combinations than necessary", {
facet <- facet_grid(a~b)
one <- panel_layout(facet, list(a))
expect_equal(nrow(one), 4)
one_a <- panel_layout(facet, list(a, empty))
expect_equal(nrow(one_a), 4)
two <- panel_layout(facet, list(a, b))
expect_equal(nrow(two), 4 + 2)
three <- panel_layout(facet, list(a, b, c))
expect_equal(nrow(three), 9)
four <- panel_layout(facet, list(b, c))
expect_equal(nrow(four), 1)
})
test_that("grid: nested rows/cols create no more combinations than necessary", {
one <- panel_layout(facet_grid(drv+cyl~.), list(mpg))
expect_equal(one$PANEL, factor(1:9))
expect_equal(one$ROW, 1:9)
})
test_that("grid: margins add correct combinations", {
one <- panel_layout(facet_grid(a~b, margins = TRUE), list(a))
expect_equal(nrow(one), 4 + 2 + 2 + 1)
})
test_that("wrap: as.table reverses rows", {
one <- panel_layout(facet_wrap(~a, ncol = 1, as.table = FALSE), list(a))
expect_equal(one$ROW, c(2, 1))
two <- panel_layout(facet_wrap(~a, nrow = 1, as.table = FALSE), list(a))
expect_equal(two$ROW, c(1, 1))
})
test_that("wrap: as.table = FALSE gets axes", {
p <- ggplot(mpg, aes(displ, hwy)) +
geom_point() +
scale_y_continuous(position = "left") +
facet_wrap(vars(class), dir = "v", as.table = FALSE)
expect_doppelganger("Axes are positioned correctly in non-table layout", p)
})
test_that("grid: as.table reverses rows", {
one <- panel_layout(facet_grid(a~., as.table = FALSE), list(a))
expect_equal(as.character(one$a), c("2", "1"))
two <- panel_layout(facet_grid(a~., as.table = TRUE), list(a))
expect_equal(as.character(two$a), c("1", "2"))
})
# Drop behaviour -------------------------------------------------------------
a2 <- data_frame(
a = factor(1:3, levels = 1:4),
b = factor(1:3, levels = 4:1)
)
test_that("wrap: drop = FALSE preserves unused levels", {
wrap_a <- panel_layout(facet_wrap(~a, drop = FALSE), list(a2))
expect_equal(nrow(wrap_a), 4)
expect_equal(as.character(wrap_a$a), as.character(1:4))
wrap_b <- panel_layout(facet_wrap(~b, drop = FALSE), list(a2))
expect_equal(nrow(wrap_b), 4)
expect_equal(as.character(wrap_b$b), as.character(4:1))
})
test_that("grid: drop = FALSE preserves unused levels", {
grid_a <- panel_layout(facet_grid(a~., drop = FALSE), list(a2))
expect_equal(nrow(grid_a), 4)
expect_equal(as.character(grid_a$a), as.character(1:4))
grid_b <- panel_layout(facet_grid(b~., drop = FALSE), list(a2))
expect_equal(nrow(grid_b), 4)
expect_equal(as.character(grid_b$b), as.character(4:1))
grid_ab <- panel_layout(facet_grid(a~b, drop = FALSE), list(a2))
expect_equal(nrow(grid_ab), 16)
expect_equal(as.character(grid_ab$a), as.character(rep(1:4, each = 4)))
expect_equal(as.character(grid_ab$b), as.character(rep(4:1, 4)))
})
# Missing behaviour ----------------------------------------------------------
a3 <- data_frame(
a = c(1:3, NA),
b = factor(c(1:3, NA)),
c = factor(c(1:3, NA), exclude = NULL)
)
test_that("missing values get a panel", {
wrap_a <- panel_layout(facet_wrap(~a), list(a3))
wrap_b <- panel_layout(facet_wrap(~b), list(a3))
wrap_c <- panel_layout(facet_wrap(~c), list(a3))
grid_a <- panel_layout(facet_grid(a~.), list(a3))
grid_b <- panel_layout(facet_grid(b~.), list(a3))
grid_c <- panel_layout(facet_grid(c~.), list(a3))
expect_equal(nrow(wrap_a), 4)
expect_equal(nrow(wrap_b), 4)
expect_equal(nrow(wrap_c), 4)
expect_equal(nrow(grid_a), 4)
expect_equal(nrow(grid_b), 4)
expect_equal(nrow(grid_c), 4)
})
# Input checking ----------------------------------------------------------
test_that("facet_wrap throws errors at bad layout specs", {
expect_snapshot_error(facet_wrap(~test, ncol = 1:4))
expect_snapshot_error(facet_wrap(~test, ncol = -1))
expect_snapshot_error(facet_wrap(~test, ncol = 1.5))
expect_snapshot_error(facet_wrap(~test, nrow = 1:4))
expect_snapshot_error(facet_wrap(~test, nrow = -1))
expect_snapshot_error(facet_wrap(~test, nrow = 1.5))
p <- ggplot(mtcars) +
geom_point(aes(mpg, disp)) +
facet_wrap(~gear, ncol = 1, nrow = 1)
expect_snapshot_error(ggplot_build(p))
p <- ggplot(mtcars) +
geom_point(aes(mpg, disp)) +
facet_wrap(~gear, scales = "free") +
coord_fixed()
expect_snapshot_error(ggplotGrob(p))
})
test_that("facet_grid throws errors at bad layout specs", {
p <- ggplot(mtcars) +
geom_point(aes(mpg, disp)) +
facet_grid(.~gear, scales = "free") +
coord_fixed()
expect_snapshot_error(ggplotGrob(p))
p <- ggplot(mtcars) +
geom_point(aes(mpg, disp)) +
facet_grid(.~gear, space = "free") +
theme(aspect.ratio = 1)
expect_snapshot_error(ggplotGrob(p))
})
test_that("facet_wrap and facet_grid throws errors when using reserved words", {
mtcars2 <- mtcars
mtcars2$PANEL <- mtcars2$cyl
mtcars2$ROW <- mtcars2$gear
p <- ggplot(mtcars2) +
geom_point(aes(mpg, disp))
expect_snapshot_error(ggplotGrob(p + facet_grid(ROW ~ gear)))
expect_snapshot_error(ggplotGrob(p + facet_grid(ROW ~ PANEL)))
expect_snapshot_error(ggplotGrob(p + facet_wrap(~ROW)))
})
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