You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: test_config.rb
    path of file: ./repos/nii/nii-core/test
    
    the code of the file until where you have to start completion: require_relative 'setup'

class TestConfig < Minit
    
  def test_new
    assert_nil Nii::Config.new.foo
    assert_nil Nii::Config.new(foo: :bar).bar
    assert_equal(:bar, Nii::Config.new(foo: :bar).foo)
    assert_equal(:baz, Nii::Config.new(foo: {bar: :baz}).foo.bar)

    config = Nii::Config.new(foo: :bar)
    assert_equal(config, Nii::Config.new(config))
    assert config.respond_to?(:foo)
    assert config.respond_to?(:foo?)
    assert config.respond_to?(:bar)
    assert config.respond_to?(:bar?)
    assert !config.respond_to?(:bar=)

    assert_equal true,  config.foo?
    assert_equal false, config.bar?
  end