Add test for cycling over empty enumberable

elixir-lang · Mar 2, 2025 · 8c3df68 · 8c3df68
1 parent e12b377
commit 8c3df68
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/lib/elixir/test/elixir/stream_test.exs b/lib/elixir/test/elixir/stream_test.exs
@@ -245,6 +245,10 @@ defmodule StreamTest do
       Stream.cycle(%{}) |> Enum.to_list()
     end
 
+    assert_raise ArgumentError, "cannot cycle over an empty enumerable", fn ->
+      Stream.cycle(..)
+    end
+
     assert Stream.cycle([1, 2, 3]) |> Stream.take(5) |> Enum.to_list() == [1, 2, 3, 1, 2]
     assert Enum.take(stream, 5) == [1, 2, 3, 1, 2]
   end