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RSpec::Mocks::ExampleMethods

Contains methods intended to be used from within code examples. Mix this in to your test context (such as a test framework base class) to use rspec-mocks with your test framework. If you’re using rspec-core, it’ll take care of doing this for you.

Public Class Methods

declare_double(type, *args) click to toggle source

@private

# File lib/rspec/mocks/example_methods.rb, line 300
def self.declare_double(type, *args)
  args << {} unless Hash === args.last
  type.new(*args)
end
declare_verifying_double(type, ref, *args) click to toggle source

@private

# File lib/rspec/mocks/example_methods.rb, line 286
def self.declare_verifying_double(type, ref, *args)
  if RSpec::Mocks.configuration.verify_doubled_constant_names? &&
    !ref.defined?

    raise VerifyingDoubleNotDefinedError,
      "#{ref.description} is not a defined constant. " +
      "Perhaps you misspelt it? " +
      "Disable check with verify_doubled_constant_names configuration option."
  end

  declare_double(type, ref, *args)
end
included(klass) click to toggle source

@private

# File lib/rspec/mocks/example_methods.rb, line 277
def self.included(klass)
  klass.class_exec do
    # This gets mixed in so that if `RSpec::Matchers` is included in
    # `klass` later, it's definition of `expect` will take precedence.
    include ExpectHost unless method_defined?(:expect)
  end
end

Public Instance Methods

allow_message_expectations_on_nil() click to toggle source

Disables warning messages about expectations being set on nil.

By default warning messages are issued when expectations are set on nil. This is to prevent false-positives and to catch potential bugs early on.

# File lib/rspec/mocks/example_methods.rb, line 92
def allow_message_expectations_on_nil
  RSpec::Mocks.space.proxy_for(nil).warn_about_expectations = false
end
class_double(doubled_class, *args) click to toggle source

@overload class_double(doubled_class)

@param doubled_class [String, Module]

@overload class_double(doubled_class, stubs)

@param doubled_class [String, Module]
@param stubs [Hash] hash of message/return-value pairs

@return ClassVerifyingDouble

Constructs a test double against a specific class. If the given class name has been loaded, only class methods defined on the class are allowed to be stubbed. In all other ways it behaves like a [double](double).

# File lib/rspec/mocks/example_methods.rb, line 66
def class_double(doubled_class, *args)
  ref = ObjectReference.for(doubled_class)
  ExampleMethods.declare_verifying_double(ClassVerifyingDouble, ref, *args)
end
double(*args) click to toggle source

@overload double() @overload double(name)

@param name [String/Symbol] used to clarify intent

@overload double(stubs)

@param stubs (Hash) hash of message/return-value pairs

@overload double(name, stubs)

@param name [String/Symbol] used to clarify intent
@param stubs (Hash) hash of message/return-value pairs

@return (Double)

Constructs an instance of [RSpec::Mocks::Double](RSpec::Mocks::Double) configured with an optional name, used for reporting in failure messages, and an optional hash of message/return-value pairs.

@example

book = double("book", :title => "The RSpec Book")
book.title #=> "The RSpec Book"

card = double("card", :suit => "Spades", :rank => "A")
card.suit  #=> "Spades"
card.rank  #=> "A"
# File lib/rspec/mocks/example_methods.rb, line 35
def double(*args)
  ExampleMethods.declare_double(Double, *args)
end
have_received(method_name, &block) click to toggle source

Verifies that the given object received the expected message during the course of the test. The method must have previously been stubbed in order for messages to be verified.

Stubbing and verifying messages received in this way implements the Test Spy pattern.

@param method_name [Symbol] name of the method expected to have been

called.

@example

invitation = double('invitation', accept: true)
user.accept_invitation(invitation)
expect(invitation).to have_received(:accept)

# You can also use most message expectations:
expect(invitation).to have_received(:accept).with(mailer).once
# File lib/rspec/mocks/example_methods.rb, line 171
def have_received(method_name, &block)
  Matchers::HaveReceived.new(method_name, &block)
end
hide_const(constant_name) click to toggle source

Hides the named constant with the given value. The constant will be undefined for the duration of the test.

Like method stubs, the constant will be restored to its original value when the example completes.

@param constant_name [String] The fully qualified name of the constant.

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

@example

hide_const("MyClass") # => MyClass is now an undefined constant
# File lib/rspec/mocks/example_methods.rb, line 149
def hide_const(constant_name)
  ConstantMutator.hide(constant_name)
end
instance_double(doubled_class, *args) click to toggle source

@overload instance_double(doubled_class)

@param doubled_class [String, Class]

@overload instance_double(doubled_class, stubs)

@param doubled_class [String, Class]
@param stubs [Hash] hash of message/return-value pairs

@return InstanceVerifyingDouble

Constructs a test double against a specific class. If the given class name has been loaded, only instance methods defined on the class are allowed to be stubbed. In all other ways it behaves like a [double](double).

# File lib/rspec/mocks/example_methods.rb, line 50
def instance_double(doubled_class, *args)
  ref = ObjectReference.for(doubled_class)
  ExampleMethods.declare_verifying_double(InstanceVerifyingDouble, ref, *args)
end
object_double(object_or_name, *args) click to toggle source

@overload object_double(object_or_name)

@param object_or_name [String, Object]

@overload object_double(object_or_name, stubs)

@param object_or_name [String, Object]
@param stubs [Hash] hash of message/return-value pairs

@return ObjectVerifyingDouble

Constructs a test double against a specific object. Only the methods the object responds to are allowed to be stubbed. If a String argument is provided, it is assumed to reference a constant object which is used for verification. In all other ways it behaves like a [double](double).

# File lib/rspec/mocks/example_methods.rb, line 82
def object_double(object_or_name, *args)
  ref = ObjectReference.for(object_or_name, :allow_direct_object_refs)
  ExampleMethods.declare_verifying_double(ObjectVerifyingDouble, ref, *args)
end
stub_const(constant_name, value, options = {}) click to toggle source

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.

@param constant_name [String] The fully qualified name of the constant. The current

constant scoping at the point of call is not considered.

@param value [Object] The value to make the constant refer to. When the

example completes, the constant will be restored to its prior state.

@param options [Hash] Stubbing options. @option 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).

@return [Object] the stubbed value of the constant

@example

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
# File lib/rspec/mocks/example_methods.rb, line 133
def stub_const(constant_name, value, options = {})
  ConstantMutator.stub(constant_name, value, options)
end

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