Class: RSpec::Matchers::BuiltIn::BeWithin

Inherits:
Object
  • Object
show all
Defined in:
lib/rspec/matchers/built_in/be_within.rb

Instance Method Summary (collapse)

Constructor Details

- (BeWithin) initialize(delta)

A new instance of BeWithin

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# File 'lib/rspec/matchers/built_in/be_within.rb', line 5
def initialize(delta)
  @delta = delta
end

Instance Method Details

- (Object) description 

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# File 'lib/rspec/matchers/built_in/be_within.rb', line 39
def description
  "be within #{@delta}#{@unit} of #{@expected}"
end

- (Object) failure_message_for_should 

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# File 'lib/rspec/matchers/built_in/be_within.rb', line 31
def failure_message_for_should
  "expected #{@actual} to #{description}"
end

- (Object) failure_message_for_should_not 

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# File 'lib/rspec/matchers/built_in/be_within.rb', line 35
def failure_message_for_should_not
  "expected #{@actual} not to #{description}"
end

- (Boolean) matches?(actual) Also known as: ==

Returns:

  • (Boolean) 
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# File 'lib/rspec/matchers/built_in/be_within.rb', line 9
def matches?(actual)
  @actual = actual
  raise needs_expected     unless defined? @expected
  raise needs_subtractable unless @actual.respond_to? :-
  (@actual - @expected).abs <= @tolerance
end

- (Object) of(expected) 

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# File 'lib/rspec/matchers/built_in/be_within.rb', line 17
def of(expected)
  @expected  = expected
  @tolerance = @delta
  @unit      = ''
  self
end

- (Object) percent_of(expected) 

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# File 'lib/rspec/matchers/built_in/be_within.rb', line 24
def percent_of(expected)
  @expected  = expected
  @tolerance = @delta * @expected.abs / 100.0
  @unit      = '%'
  self
end