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BDD testing framework for Elixir inspired by RSpec.
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lib/espec/assertions/string/start_with.ex
defmodule ESpec.Assertions.String.StartWith do
@moduledoc """
Defines 'start_with' assertion.
it do: expect(string).to start_with(value)
"""
use ESpec.Assertions.Interface
defp match(string, val) do
result = String.starts_with?(string, val)
if result do
{result, val}
else
length = String.length(string)
split_at = if length > 3, do: 3, else: length
{first3, _} = String.split_at(string, split_at)
{result, "#{first3}..."}
end
end
defp success_message(string, val, _result, positive) do
to = if positive, do: "starts", else: "doesn't start"
"`#{inspect string}` #{to} with `#{inspect val}`."
end
defp error_message(string, val, result, positive) do
to = if positive, do: "to", else: "not to"
"Expected `#{inspect string}` #{to} start with `#{val}` but it starts with `#{result}`."
end
end