Method: Test::Unit::Assertions#assert_type_has_instance_methods

Defined in:
lib/xqsr3/extensions/test/unit/assert_type_has_instance_methods.rb

#assert_type_has_instance_methods(type, message_spec, failure_message = nil) ⇒ Object

Fails unless the given type responds to all of the messages given by message_spec

Signature

  • Parameters:

    • type (::Class) The type

    • message_spec (::Symbol, ::Array, ::Hash) A specification of message(s) received by the instances of type. If a ::Symbol, then instances must respond to this single message. If an ::Array (all elements of which must be ::Symbol), then instances must respond to all messages. If a ::Hash, then instances must respond to all messages represented by the keys; the values are available for specifying a custom failure message (or value is nil for stock message)

  • failure_message (::String) If specified, is used when instances of type do not respond to a message and no custom failure message is provided for it



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# File 'lib/xqsr3/extensions/test/unit/assert_type_has_instance_methods.rb', line 18

def assert_type_has_instance_methods(type, message_spec, failure_message = nil)

  warn "type parameter - '#{type} (#{type.class})' - should be a Class" unless type.is_a?(::Class)

  case message_spec
  when ::Hash

    warn "every key in a Hash message_spec should be of type Symbol" unless message_spec.keys.all? { |k| ::Symbol === k }
  when ::Array

    warn "every key in an Array message_spec should be of type Symbol" unless message_spec.all? { |k| ::Symbol === k }

    message_spec = Hash[message_spec.map { |s| [ s, nil ] }]
  when ::Symbol

    message_spec[message_spec] = nil
  else

    msg = "message_spec - '#{message_spec} (#{message_spec.class})' - should be a Symbol, an Array of Symbols, or a Hash of Symbol => message"

    warn msg

    return assert false, msg
  end

  ims = type.instance_methods

  message_spec.each do |sym, message|

    unless ims.include? sym

      message ||= failure_message
      message ||= "type #{type} does not contain the instance method #{sym}"

      return assert false, message
    end
  end

  assert true
end