Class: RSpec::Mocks::ConstantMutator

Inherits:
Object
  • Object
show all
Extended by:
RecursiveConstMethods
Defined in:
lib/rspec/mocks/mutate_const.rb

Overview

Provides a means to stub constants.

Defined Under Namespace

Classes: BaseMutator, ConstantHider, DefinedConstantReplacer, UndefinedConstantSetter

Class Method Summary (collapse)

Methods included from RecursiveConstMethods

const_defined_on?, constants_defined_on, get_const_defined_on, normalize_const_name, recursive_const_defined?, recursive_const_get

Class Method Details

+ (Object) find(name) 

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# File 'lib/rspec/mocks/mutate_const.rb', line 379
def self.find(name)
  mutators.find { |s| s.full_constant_name == name }
end

+ (Object) hide(constant_name)

Note:

It's recommended that you use hide_const in your examples. This is an alternate public API that is provided so you can hide constants in other contexts (e.g. helper classes).

Hides a constant.

Parameters:

  • constant_name (String) —

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

See Also:

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# File 'lib/rspec/mocks/mutate_const.rb', line 189
def self.hide(constant_name)
  return unless recursive_const_defined?(constant_name)
  mutate(ConstantHider.new(constant_name, nil, { }))
  nil
end

+ (Object) mutate(mutator)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Uses the mutator to mutate (stub or hide) a constant. Ensures that the mutator is correctly registered so it can be backed out at the end of the test.

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# File 'lib/rspec/mocks/mutate_const.rb', line 348
def self.mutate(mutator)
  register_mutator(mutator)
  mutator.mutate
end

+ (Object) mutators

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

The list of constant mutators that have been used for the current example.

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# File 'lib/rspec/mocks/mutate_const.rb', line 370
def self.mutators
  @mutators ||= []
end

+ (Object) raise_on_invalid_const

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Used internally by the constant stubbing to raise a helpful error when a constant like "A::B::C" is stubbed and A::B is not a module (and thus, it's impossible to define "A::B::C" since only modules can have nested constants).

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# File 'lib/rspec/mocks/mutate_const.rb', line 389
def self.raise_on_invalid_const
  lambda do |const_name, failed_name|
    raise "Cannot stub constant #{failed_name} on #{const_name} " +
          "since #{const_name} is not a module."
  end
end

+ (Object) register_mutator(mutator)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 

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# File 'lib/rspec/mocks/mutate_const.rb', line 375
def self.register_mutator(mutator)
  mutators << mutator
end

+ (Object) reset_all

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Resets all stubbed constants. This is called automatically by rspec-mocks when an example finishes.

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# File 'lib/rspec/mocks/mutate_const.rb', line 357
def self.reset_all
  # We use reverse order so that if the same constant
  # was stubbed multiple times, the original value gets
  # properly restored.
  mutators.reverse.each { |s| s.rspec_reset }
  mutators.clear
end

+ (Object) stub(constant_name, value, options = {})

Note:

It's recommended that you use stub_const in your examples. This is an alternate public API that is provided so you can stub constants in other contexts (e.g. helper classes).

Stubs a constant.

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

See Also:

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# File 'lib/rspec/mocks/mutate_const.rb', line 169
def self.stub(constant_name, value, options = {})
  mutator = if recursive_const_defined?(constant_name, &raise_on_invalid_const)
    DefinedConstantReplacer
  else
    UndefinedConstantSetter
  end
  mutate(mutator.new(constant_name, value, options[:transfer_nested_constants]))
  value
end