class RSpec::Matchers::BuiltIn::Change

Public Class Methods

new(receiver=nil, message=nil, &block) click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 5
def initialize(receiver=nil, message=nil, &block)
  @message = message
  @value_proc = block || lambda {receiver.__send__(message)}
  @expected_after = @expected_before = @minimum = @maximum = @expected_delta = nil
  @eval_before = @eval_after = false
end

Public Instance Methods

actual_delta() click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 53
def actual_delta
  @actual_after - @actual_before
end
by(expected_delta) click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 61
def by(expected_delta)
  @expected_delta = expected_delta
  self
end
by_at_least(minimum) click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 66
def by_at_least(minimum)
  @minimum = minimum
  self
end
by_at_most(maximum) click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 71
def by_at_most(maximum)
  @maximum = maximum
  self
end
description() click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 88
def description
  "change ##{message}"
end
evaluate_value_proc() click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 28
def evaluate_value_proc
  case val = @value_proc.call
  when Enumerable
    val.dup
  else
    val
  end
end
failure_message_for_should() click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 37
def failure_message_for_should
  if @eval_before && !expected_matches_actual?(@expected_before, @actual_before)
    "#{message} should have initially been #{@expected_before.inspect}, but was #{@actual_before.inspect}"
  elsif @eval_after && !expected_matches_actual?(@expected_after, @actual_after)
    "#{message} should have been changed to #{@expected_after.inspect}, but is now #{@actual_after.inspect}"
  elsif @expected_delta
    "#{message} should have been changed by #{@expected_delta.inspect}, but was changed by #{actual_delta.inspect}"
  elsif @minimum
    "#{message} should have been changed by at least #{@minimum.inspect}, but was changed by #{actual_delta.inspect}"
  elsif @maximum
    "#{message} should have been changed by at most #{@maximum.inspect}, but was changed by #{actual_delta.inspect}"
  else
    "#{message} should have changed, but is still #{@actual_before.inspect}"
  end
end
failure_message_for_should_not() click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 57
def failure_message_for_should_not
  "#{message} should not have changed, but did change from #{@actual_before.inspect} to #{@actual_after.inspect}"
end
from(before) click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 82
def from (before)
  @eval_before = true
  @expected_before = before
  self
end
matches?(event_proc) click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 12
def matches?(event_proc)
  raise_block_syntax_error if block_given?

  @actual_before = evaluate_value_proc
  event_proc.call
  @actual_after = evaluate_value_proc

  (!change_expected? || changed?) && matches_before? && matches_after? && matches_expected_delta? && matches_min? && matches_max?
end
raise_block_syntax_error() click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 22
        def raise_block_syntax_error
          raise SyntaxError.new("block passed to should or should_not change must use {} instead of do/end
")
        end
to(to) click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 76
def to(to)
  @eval_after = true
  @expected_after = to
  self
end

Private Instance Methods

change_expected?() click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 98
def change_expected?
  @expected_delta != 0
end
changed?() click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 102
def changed?
  @actual_before != @actual_after
end
expected_matches_actual?(expected, actual) click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 126
def expected_matches_actual?(expected, actual)
  expected === actual
end
matches_after?() click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 110
def matches_after?
  @eval_after ? expected_matches_actual?(@expected_after, @actual_after) : true
end
matches_before?() click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 106
def matches_before?
  @eval_before ? expected_matches_actual?(@expected_before, @actual_before) : true
end
matches_expected_delta?() click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 114
def matches_expected_delta?
  @expected_delta ? (@actual_before + @expected_delta == @actual_after) : true
end
matches_max?() click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 122
def matches_max?
  @maximum ? (@actual_after - @actual_before <= @maximum) : true
end
matches_min?() click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 118
def matches_min?
  @minimum ? (@actual_after - @actual_before >= @minimum) : true
end
message() click to toggle source
# File lib/rspec/matchers/built_in/change.rb, line 94
def message
  @message || "result"
end