nose2: run tests from an imported module

I generated and imported a module that contains a test that I want to run with nose2. Here is the code that creates and import the module:

import sys
import imp
import nose2


def import_code(code, name):
    module = imp.new_module(name)
    exec code in module.__dict__
    sys.modules[name] = module
    return module

code_to_test = ("""
def test_foo():
    print "hello test_foo"
""")

module_to_test = import_code(code_to_test, 'moduletotest')

# now how can I tell nose2 to run the test?