mock_objects.php
public function expectOnce($method, $args = false, $message = '%s')
    {
        $this->expectCallCount($method, 1, $message);
        if ($args !== false) {
            $this->expect($method, $args, $message);
        }
    }
public function expectOnce($method, $args = false, $message = '%s')
    {
        $this->expectCallCount($method, 1, $message);
        if ($args !== false) {
            $this->expect($method, $args, $message);
        }
    }
Convenience method for a single method call.

@param string $method     Method call to track.
@param array $args        Expected argument list or false for any arguments.
@param string $message    Overridden message.