public function testInvokeFlow()
{
$func = function () use(&$called) {
$called = true;
return true;
};
$flow = Flow::map($func);
$node = m::mock(NodeCollectionInterface::class);
$node->shouldReceive('map')->with($func)->andReturn([]);
$response = call_user_func($flow, $node);
static::assertNotSame($response, $node);
static::assertInstanceOf(NodeCollectionInterface::class, $response);
}
