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25-set.exs
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25-set.exs
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ExUnit.start
defmodule SetTest do
use ExUnit.Case
test "to_list" do
list = Enum.into([1, 2, 2, 3], HashSet.new) |> HashSet.to_list
assert list == [2, 3, 1] # unintuitive ordering
end
test "union" do
union = Enum.into([1, 2, 3], HashSet.new) |> HashSet.union(Enum.into([2, 3, 4], HashSet.new))
assert Set.to_list(union) == [2, 3, 4, 1] # unintuitive, but somewhat more understandable
end
test "intersection" do
union = Enum.into([1, 2, 3], HashSet.new) |> HashSet.intersection(Enum.into([2, 3, 4], HashSet.new))
assert Set.to_list(union) == [2, 3]
end
test "member?" do
refute Enum.into([1, 3, 5], HashSet.new) |> HashSet.member?(2)
end
end