I have a dag where I have a task called start which is a dummy operator . Before the start I have a few input sensors for checking the file . I need to run the DAG for test cases .

1. all the input sensors are success, start and downstream should run – DAG should be success
   2)if any one of the input sensors fail, DAG should stop at start , the downstream tasks after start should get skipped and the DAG should fail

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all the input sensors are success, start and downstream should run – DAG should be success
if any one of the input sensors fail, it should stop at start and the downstream tasks after start should be skipped and DAG should fail