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More about adding a collaboratorRSpec Mocks 2.11
rspec-mocks helps to control the context in a code example by letting you set
known return values, fake implementations of methods, and even expectations
that specific messages are received by an object.
You can do these three things on test doubles that rspec-mocks creates for you
on the fly, or you can do them on objects that are part of your system.
Messages and Methods
Message and method are metaphors that we use somewhat interchangeably, but
they are subtly different. In Object Oriented Programming, objects communicate
by sending messages to one another. When an object receives a message, it
invokes a method with the same name as the message.
Test Doubles
A test double is an object that stands in for another object in your system
during a code example. Use the double
method to create one:
double_account = double("Account")
You can also use the mock
and stub
methods to create test doubles, however
these methods are there for backward compatibility only and will likely be
deprecated and then removed from future versions.
Method Stubs
A method stub is an instruction to an object (real or test double) to return a
known value in response to a message:
die.stub(:roll) { 3 }
This tells the die
object to return the value 3
when it receives the roll
message.
Message Expectations
A message expectation is an expectation that an object should receive a
specific message during the course of a code example:
describe Account do
context "when closed" do
it "logs an 'account closed' message" do
logger = double()
account = Account.new
account.logger = logger
logger.should_receive(:account_closed).with(account)
account.close
end
end
end
This example specifies that the account
object sends the logger
the
account_closed
message (with itself as an argument) when it receives the
close
message.
Issues
The documentation for rspec-mocks is a work in progress. We'll be adding
Cucumber features over time, and clarifying existing ones. If you have
specific features you'd like to see added, find the existing documentation
incomplete or confusing, or, better yet, wish to write a missing Cucumber
feature yourself, please submit an issue or a pull request.
Topics
- Upgrade
- Scope
- Changelog
- Method stubs
- Message expectations
- Argument matchers
- Stubbing constants
- Outside rspec
Last published over 7 years ago by .