TEST: Palette capability: "accepts_native_output"

Author: zeehio

tests/testthat/test-scale-colour-continuous.R

@@ -25,6 +25,43 @@ test_that("scale_params mapping_method supports binned", {
   expect_equal(length(unique(only_two)), 2L)
 })
 
+test_that("palette with accepts_native_output returns native colours", {
+  sc <- scale_fill_continuous()
+  sc$palette <- structure(
+    function(x, color_fmt = "character") {
+      if (color_fmt == "character") {
+        rep("red", length(x))
+      } else {
+        rep(-16776961L, length(x))
+      }
+    },
+    accepts_native_output = TRUE
+  )
+  x <- 0.5
+  nat <- sc$map(x, limits = c(0, 1), scale_params = list(color_fmt = "native"))
+  expect_equal(nat, -16776961L)
+  chr <- sc$map(x, limits = c(0, 1), scale_params = list(color_fmt = "character"))
+  expect_equal(chr, "red")
+  chr2 <- sc$map(x, limits = c(0, 1))
+  expect_equal(chr, chr2)
+})
+
+test_that("palette without accepts_native_output returns native colours as well", {
+  sc <- scale_fill_continuous()
+  sc$palette <- function(x) {
+    rep("red", length(x))
+  }
+  x <- 0.5
+  nat <- sc$map(x, limits = c(0, 1), scale_params = list(color_fmt = "native"))
+  expect_equal(nat, -16776961L)
+  chr <- sc$map(x, limits = c(0, 1), scale_params = list(color_fmt = "character"))
+  expect_equal(chr, "red")
+  chr2 <- sc$map(x, limits = c(0, 1))
+  expect_equal(chr, chr2)
+})
+
+
+
 test_that("palette with may_return_NA=FALSE works as expected", {
   sc <- scale_fill_continuous()
   # A palette that may return NAs, will have NAs replaced by the scale's na.value