class RSpec::Matchers::MultiMatcherDiff

@api private Handles list of expected and actual value pairs when there is a need to render multiple diffs. Also can handle one pair.

Constants

DEFAULT_DIFF_LABEL

@private Default diff label when there is only one matcher in diff output

DESCRIPTION_MAX_LENGTH

@private Maximum readable matcher description length

Public Class Methods

for_many_matchers(matchers) click to toggle source

@api private Wraps provided matcher list in instance of MultiMatcherDiff. @param [Array<Any>] matchers list of matchers to wrap @return [RSpec::Matchers::MultiMatcherDiff]

# File lib/rspec/matchers/multi_matcher_diff.rb, line 37
def self.for_many_matchers(matchers)
  new(matchers.map { |m| [m.expected, diff_label_for(m), m.actual] })
end
from(expected, actual) click to toggle source

@api private Wraps provided expected value in instance of MultiMatcherDiff. If provided value is already an MultiMatcherDiff then it just returns it. @param [Any] expected value to be wrapped @param [Any] actual value @return [RSpec::Matchers::MultiMatcherDiff]

# File lib/rspec/matchers/multi_matcher_diff.rb, line 27
def self.from(expected, actual)
  return expected if self === expected
  new([[expected, DEFAULT_DIFF_LABEL, actual]])
end
new(expected_list) click to toggle source
# File lib/rspec/matchers/multi_matcher_diff.rb, line 16
def initialize(expected_list)
  @expected_list = expected_list
end

Private Class Methods

diff_label_for(matcher) click to toggle source
# File lib/rspec/matchers/multi_matcher_diff.rb, line 58
def diff_label_for(matcher)
  "Diff for (#{truncated(RSpec::Support::ObjectFormatter.format(matcher))}):"
end
truncated(description) click to toggle source
# File lib/rspec/matchers/multi_matcher_diff.rb, line 62
def truncated(description)
  return description if description.length <= DESCRIPTION_MAX_LENGTH
  description[0...DESCRIPTION_MAX_LENGTH - 3] << "..."
end

Public Instance Methods

message_with_diff(message, differ) click to toggle source

@api private Returns message with diff(s) appended for provided differ factory and actual value if there are any @param [String] message original failure message @param [Proc] differ @return [String]

# File lib/rspec/matchers/multi_matcher_diff.rb, line 47
def message_with_diff(message, differ)
  diff = diffs(differ)
  message = "#{message}\n#{diff}" unless diff.empty?
  message
end

Private Instance Methods

diffs(differ) click to toggle source
# File lib/rspec/matchers/multi_matcher_diff.rb, line 68
def diffs(differ)
  @expected_list.map do |(expected, diff_label, actual)|
    diff = differ.diff(actual, expected)
    next if diff.strip.empty?
    if diff == "\e[0m\n\e[0m"
      "#{diff_label}\n" \
        "  <The diff is empty, are your objects producing identical `#inspect` output?>"
    else
      "#{diff_label}#{diff}"
    end
  end.compact.join("\n")
end