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module Spec
module Expectations
module Should
class Change < Base
def initialize(target, receiver=nil, message=nil, &block)
@block = block
@target = target
@receiver = receiver
@message = message
execute_change
evaluate_change
end
def execute_change
@before_change = @block.nil? ? @receiver.send(@message) : @block.call
@target.call
@after_change = @block.nil? ? @receiver.send(@message) : @block.call
end
def message
@message.nil? ? 'result' : @message
end
def evaluate_change
if @before_change == @after_change
fail_with_message "#{message} should have changed, but is still #{@after_change.inspect}"
end
end
def from(value)
if @before_change != value
fail_with_message "#{message} should have initially been #{value.inspect}, but was #{@before_change.inspect}"
end
self
end
def to(value)
if @after_change != value
fail_with_message "#{message} should have been changed to #{value.inspect}, but is now #{@after_change.inspect}"
end
self
end
def by(expected_delta)
if actual_delta != expected_delta
fail_with_message "#{message} should have been changed by #{expected_delta}, but was changed by #{actual_delta}"
end
self
end
private
def actual_delta
@after_change - @before_change
end
end
class NotChange < Change
def evaluate_change
if @before_change != @after_change
fail_with_message "#{@message} should not have changed, but did change from #{@before_change.inspect} to #{@after_change.inspect}"
end
end
end
end
end
end
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