public function createGlobal($function, $namespace)
{
if (false !== strpos($function, '\\')) {
throw new InvalidArgumentException('Only functions in the global namespace are supported.');
}
$namespace = trim($namespace, '\\');
if (!$namespace) {
throw new InvalidArgumentException('The supplied namespace must not be empty.');
}
$stub = $this->stubFactory->create($function);
$spy = $this->spyFactory->create($stub);
$this->functionHookManager->defineFunction($function, $namespace, $spy);
return new StubVerifier($stub, $spy, $this->matcherFactory, $this->matcherVerifier, $this->generatorVerifierFactory, $this->iterableVerifierFactory, $this->callVerifierFactory, $this->assertionRecorder, $this->assertionRenderer, $this->generatorAnswerBuilderFactory);
}