test_that("Graphic objects can be initiated without arguments", {
expect_true(is.R6(Graphic$new()))
})
test_that("Layer objects be be added using add_layer()", {
graphic <- Graphic$new()$add_layer(Layer$new())
expect_equal(graphic$layers$size(), 1)
expect_error(graphic$add_layer(NULL), class = "bad_r6_type")
})
test_that("Scale objects be be added using add_scale()", {
graphic <- Graphic$new()$add_scale(ScaleNull$new())
expect_equal(graphic$scales$size(), 1)
expect_error(graphic$add_scale(NULL), class = "bad_r6_type")
})
test_that("Graphic$add_scale() does not replace existing scales", {
graphic <- Graphic$new()$add_scale(ScaleNull$new("x"))
scale2 <- ScaleNull$new(c("x", "x2"))
expect_error(graphic$add_scale(scale2), "already exists")
expect_silent(graphic$replace_scale(scale2))
expect_identical(graphic$scales$scale("x"), scale2)
})
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