Add test for quantile with repeated values

Author: juliohm

test/Project.toml

@@ -4,6 +4,7 @@ CategoricalArrays = "324d7699-5711-5eae-9e2f-1d82baa6b597"
 CoDa = "5900dafe-f573-5c72-b367-76665857777b"
 ColumnSelectors = "9cc86067-7e36-4c61-b350-1ac9833d277f"
 DataScienceTraits = "6cb2f572-2d2b-4ba6-bdb3-e710fa044d6c"
+DelimitedFiles = "8bb1440f-4735-579b-a4ab-409b98df4dab"
 Distributions = "31c24e10-a181-5473-b8eb-7969acd0382f"
 ImageIO = "82e4d734-157c-48bb-816b-45c225c6df19"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"