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be_within.rb
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be_within.rb
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module RSpec
module Matchers
module BuiltIn
class BeWithin
def initialize(delta)
@delta = delta
end
def matches?(actual)
@actual = actual
raise needs_expected unless defined? @expected
raise needs_numeric unless @actual.is_a? Numeric
(@actual - @expected).abs <= @delta
end
def of(expected)
@expected = expected
self
end
def failure_message_for_should
"expected #{@actual} to #{description}"
end
def failure_message_for_should_not
"expected #{@actual} not to #{description}"
end
def description
"be within #{@delta} of #{@expected}"
end
private
def needs_numeric
ArgumentError.new "The actual value (#{@actual.inspect}) must be of a `Numeric` type"
end
def needs_expected
ArgumentError.new "You must set an expected value using #of: be_within(#{@delta}).of(expected_value)"
end
end
end
end
end