module Compact

To record the interactions of your test_double, prepare inside a block passed to this method. Give the role played by the mock a name so we can cross-reference it with tests against the real implementation.

my_watched_mock = Compact.prepare_double('role_name') do
  mock = MyMock.new
  mock.expect(:method_name, return_args, when_called_with)
end

The returned mock is decorated with an ArgumentInterceptor that records:

• methods sent to it

• the arguments with which they were called

• and the return values

and stores these +Invocation+s in an instance of the Ledger class for comparison with the corresponding contract tests in verify_contract.

# File lib/compact.rb, line 29
def self.prepare_double(name, block = Proc.new)
  @@ledger.prepare_double(name, block)
end

Unlikely to be used by end users of this gem. Used to write test reporters that give us the low-down at the end of our suite.

# File lib/compact.rb, line 51
def self.summary
  @@ledger.summary
end

Calling this method checks that the collaborator param is an object capable of fulfilling the role defined by name (for which see prepare_double).

Example usage:

Compact.verify_contract('role_name', myObject) do
  expected = return_value
  actual =  myObject.method_name(*args_specified_by_test_double)
  assert_equal expected, actual
end

# File lib/compact.rb, line 45
def self.verify_contract(name, collaborator, block = Proc.new )
  @@ledger.verify_contract(name, collaborator, block)
end