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espec lib espec assertions match.ex
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lib/espec/assertions/match.ex

defmodule ESpec.Assertions.Match do
use ESpec.Assertion
defp match(subject, value) do
result = subject =~ value
{result, result}
end
defp success_message(subject, data, result, positive) do
to = if positive, do: "matches", else: "doesn't match"
"`#{inspect subject}` #{to} (=~) `#{inspect data}`."
end
defp error_message(subject, data, _result, positive) do
to = if positive, do: "to", else: "not to"
but = if positive, do: "doesn't", else: "does"
"Expected `#{inspect subject}` #{to} match (=~) `#{inspect data}`, but it #{but}."
end
end