diff --git a/tests/testthat/helper_seriesaggreg.R b/tests/testthat/helper_seriesaggreg.R
deleted file mode 100644
index e09bc4a13acc22649c814db7de46096010e23377..0000000000000000000000000000000000000000
--- a/tests/testthat/helper_seriesaggreg.R
+++ /dev/null
@@ -1,3 +0,0 @@
-sample2 <- function(x) {sample(x, 2)}
-
-stringFunction <- function(x) {format(max(x))}
diff --git a/tests/testthat/test-SeriesAggreg.R b/tests/testthat/test-SeriesAggreg.R
index ce5cf87610b64ddcebe084d883b3ea8acba54547..7ec93199f305eb123ba1cd4b917a73e5196588d2 100644
--- a/tests/testthat/test-SeriesAggreg.R
+++ b/tests/testthat/test-SeriesAggreg.R
@@ -230,11 +230,3 @@ test_that("SeriesAggreg should work with ConvertFun 'min', 'max' and 'median'",
   }
   lapply(c("max", "min", "median"), function(x) {test_ConvertFunRegime(Qls, x, "%Y")})
 })
-
-test_that("Error on wrong aggregation function", {
-  Qls <- BasinObs[, c("DatesR", "Qls")]
-  expect_error(SeriesAggreg(Qls, "%Y", ConvertFun = "sample2"),
-               regexp = "should be of length 1")
-  expect_error(SeriesAggreg(Qls, "%Y", ConvertFun = "stringFunction"),
-               regexp = "should be numeric")
-})