Method: RSpec::Mocks::ExampleMethods#stub_const

Defined in:
lib/rspec/mocks/example_methods.rb

#stub_const(constant_name, value, options = {}) ⇒ Object

Stubs the named constant with the given value. Like method stubs, the constant will be restored to its original value (or lack of one, if it was undefined) when the example completes.

Examples:

stub_const("MyClass", Class.new) # => Replaces (or defines) MyClass with a new class object.
stub_const("SomeModel::PER_PAGE", 5) # => Sets SomeModel::PER_PAGE to 5.

class CardDeck
  SUITS = [:Spades, :Diamonds, :Clubs, :Hearts]
  NUM_CARDS = 52
end

stub_const("CardDeck", Class.new)
CardDeck::SUITS # => uninitialized constant error
CardDeck::NUM_CARDS # => uninitialized constant error

stub_const("CardDeck", Class.new, :transfer_nested_constants => true)
CardDeck::SUITS # => our suits array
CardDeck::NUM_CARDS # => 52

stub_const("CardDeck", Class.new, :transfer_nested_constants => [:SUITS])
CardDeck::SUITS # => our suits array
CardDeck::NUM_CARDS # => uninitialized constant error

Parameters:

  • constant_name (String) —

    The fully qualified name of the constant. The current constant scoping at the point of call is not considered.

  • value (Object) —

    The value to make the constant refer to. When the example completes, the constant will be restored to its prior state.

  • options (Hash) (defaults to: {}) —

    Stubbing options.

Options Hash (options):

  • :transfer_nested_constants (Boolean, Array<Symbol>) —

    Determines what nested constants, if any, will be transferred from the original value of the constant to the new value of the constant. This only works if both the original and new values are modules (or classes).

Returns:

  • (Object) —

    the stubbed value of the constant



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# File 'lib/rspec/mocks/example_methods.rb', line 241

def stub_const(constant_name, value, options={})
  ConstantMutator.stub(constant_name, value, options)
end