diff --git a/tests/testthat/test-scale-colour-continuous.R b/tests/testthat/test-scale-colour-continuous.R
index 444b27f9db..b75a32e58d 100644
--- a/tests/testthat/test-scale-colour-continuous.R
+++ b/tests/testthat/test-scale-colour-continuous.R
@@ -18,6 +18,12 @@ test_that("type argument is checked for proper input", {
     scale_colour_continuous(type = "abc")
   )
 })
+test_that("scale_params mapping_method supports binned", {
+  sc <- scale_fill_continuous()
+  x <- seq(0, 1, length.out = 10)
+  only_two <- sc$map(x, limits = c(0, 1), scale_params = list(mapping_method = "binned", mapping_method_bins = 2))
+  expect_equal(length(unique(only_two)), 2L)
+})
 
 test_that("palette with may_return_NA=FALSE works as expected", {
   sc <- scale_fill_continuous()