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# Visual tests ------------------------------------------------------------
test_that("check h/v/abline transformed on basic projections", {
dat <- data_frame(x = LETTERS[1:5], y = 1:5)
plot <- ggplot(dat, aes(x, y)) +
geom_col(width = 1) +
geom_point() +
geom_vline(xintercept = 3, colour = "red") +
geom_hline(yintercept = 3, colour = "blue") +
geom_abline(intercept = 0, slope = 1, colour = "purple") +
labs(x = NULL, y = NULL) +
coord_cartesian(expand = FALSE)
expect_doppelganger(
"cartesian lines intersect mid-bars",
plot
)
expect_doppelganger(
"flipped lines intersect mid-bars",
plot + coord_flip()
)
expect_doppelganger(
"polar lines intersect mid-bars",
plot + coord_polar()
)
})
test_that("curved lines in map projections", {
skip_if(packageVersion("base") < "3.5.0")
nz <- subset(map_data("nz"), region == "North.Island ")
nzmap <- ggplot(nz, aes(long, lat, group = group)) +
geom_path() +
geom_hline(yintercept = -38.6) + # roughly Taupo
geom_vline(xintercept = 176) +
coord_map()
expect_doppelganger("straight lines in mercator",
nzmap
)
expect_doppelganger("lines curved in azequalarea",
nzmap + coord_map(projection = 'azequalarea', orientation = c(-36.92, 174.6, 0))
)
})
# Warning tests ------------------------------------------------------------
test_that("warnings are thrown when parameters cause mapping and data to be ignored", {
expect_snapshot_warning(geom_vline(aes(), xintercept = 2))
expect_snapshot_warning(geom_vline(data = mtcars, xintercept = 2))
expect_snapshot_warning(geom_hline(aes(), yintercept = 2))
expect_snapshot_warning(geom_hline(data = mtcars, yintercept = 2))
expect_snapshot_warning(geom_abline(aes(), slope = 2))
expect_snapshot_warning(geom_abline(aes(), intercept = 2))
expect_snapshot_warning(geom_abline(data = mtcars, slope = 2))
expect_snapshot_warning(geom_abline(data = mtcars, intercept = 2))
})
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