Module: RSpec::Matchers::AllBe

Defined in:
lib/rspec-collection/all_be.rb

Overview

Helper functions gathered here to avoid global name space pollution.

Class Method Summary collapse

Class Method Details

.format_predicate(pred, *args) ⇒ Object

Format a predicate function (with option arguments) for human readability.



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# File 'lib/rspec-collection/all_be.rb', line 28

def format_predicate(pred, *args)
  message_elements =
    ["be #{pred.gsub(/_/, ' ')}"] +
    args.map { |a| a.inspect }
  message_elements.join(' ')
end

.make_matcher(condition_string, &block) ⇒ Object

Create a collection matcher using block as the matching condition. Block should take one or two arguments:

lambda { |element| ... }
lambda { |element, messages| ... }

If a block wishes to use custom failure messages, it should append the message to the messages array. Otherwise we will format an appropriate error message for each failing element.



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# File 'lib/rspec-collection/all_be.rb', line 45

def make_matcher(condition_string, &block)
  Matcher.new :all_be, block do |_block_|
    @failing_messages = []
    @broken = []
    match do |actual|
      actual.each do |element|
        unless _block_.call(element, @failing_messages)
          @broken << element
        end
      end
      @broken.empty?
    end

    failure_message_for_should do |actual|
      messages = ["in #{actual.inspect}:"]
      if @failing_messages.empty?
        messages += @broken.map { |element| "expected #{element.inspect} to #{condition_string}" }
      else
        messages += @failing_messages
      end
      messages.join("\n")
    end

    failure_message_for_should_not do |actual|
      "expected #{actual.inspect} to not all #{condition_string}"
    end

    description do
      "all be"
    end
  end
end