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add property test for String.count_matches/2 #212

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add property test for String.count_matches/2 #212

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11 changes: 11 additions & 0 deletions test/stdlib/string_test.exs
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Original file line number Diff line number Diff line change
Expand Up @@ -25,4 +25,15 @@ defmodule StreamData.StringTest do
end
end
end

if Version.match?(System.version(), "~> 1.19.0-dev") do
# From https://github.com/elixir-lang/elixir/pull/14448.
property "String.count_matches/2 is equivalent to String.split/1 + Kernel.length/1 - 1" do
check all string <- string(:printable),
pattern <- string(:printable) do
assert String.count_matches(string, pattern) ==
string |> String.split(pattern) |> Kernel.length() |> Kernel.-(1)
end
end
end
end