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puma--puma/test/helpers/config_file.rb

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class TestConfigFileBase < Minitest::Test
private
def with_env(env = {})
original_env = {}
env.each do |k, v|
original_env[k] = ENV[k]
ENV[k] = v
end
yield
ensure
original_env.each do |k, v|
ENV[k] = v
end
end
end