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Contents
module RSpec
module Matchers
module BuiltIn
# @api private
# Provides the implementation for `be_within`.
# Not intended to be instantiated directly.
class BeWithin < BaseMatcher
def initialize(delta)
@delta = delta
end
# @api public
# Sets the expected value.
def of(expected)
@expected = expected
@tolerance = @delta
@unit = ''
self
end
# @api public
# Sets the expected value, and makes the matcher do
# a percent comparison.
def percent_of(expected)
@expected = expected
@tolerance = @expected.abs * @delta / 100.0
@unit = '%'
self
end
# @private
def matches?(actual)
@actual = actual
raise needs_expected unless defined? @expected
numeric? && (@actual - @expected).abs <= @tolerance
end
# @api private
# @return [String]
def failure_message
"expected #{actual_formatted} to #{description}#{not_numeric_clause}"
end
# @api private
# @return [String]
def failure_message_when_negated
"expected #{actual_formatted} not to #{description}"
end
# @api private
# @return [String]
def description
"be within #{@delta}#{@unit} of #{expected_formatted}"
end
private
def numeric?
@actual.respond_to?(:-)
end
def needs_expected
ArgumentError.new "You must set an expected value using #of: be_within(#{@delta}).of(expected_value)"
end
def not_numeric_clause
", but it could not be treated as a numeric value" unless numeric?
end
end
end
end
end
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