public function testInvokeFlow()
{
$flow1 = m::mock(FlowInterface::class);
$flow2 = m::mock(FlowInterface::class);
$runner = Flow::run($flow1, $flow2);
$node1 = m::mock(NodeInterface::class);
$node2 = m::mock(NodeInterface::class);
$node3 = m::mock(NodeInterface::class);
$flow1->shouldReceive('flow')->with($node1)->andReturn($node2);
$flow2->shouldReceive('flow')->with($node2)->andReturn($node3);
static::assertEquals($node3, call_user_func($runner, $node1));
}
