Intelligent Design Evolution vs Darwinian and neo-Darwinian Evolution

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I thought this was obvious but here goes- IDE vs DE/ NDE-

ID is based on three premises and the inference that follows (DeWolf et al., Darwinism, Design and Public Education, pg. 92):

1) High information content (or specified complexity) and irreducible complexity constitute strong indicators or hallmarks of (past) intelligent design.

2) Biological systems have a high information content (or specified complexity) and utilize subsystems that manifest irreducible complexity.

3) Naturalistic mechanisms or undirected causes do not suffice to explain the origin of information (specified complexity) or irreducible complexity.

4) Therefore, intelligent design constitutes the best explanations for the origin of information and irreducible complexity in biological systems.

Cause and effect relationships- the processes we observe in the present is the key to the past.

Therefor if it was ever demonstrated that living organisms can be reduced to chemistry and physics (as OgreMKV puts it) Intelligent Design would be falsified:

In fact, my argument for intelligent design is open to direct
experimental rebuttal. Here is a thought experiment that makes the point clear. In Darwin’s Black Box (Behe 1996) I claimed that the bacterial flagellum was irreducibly complex and so required deliberate intelligent design. The flip side of this claim is that the flagellum can’t be produced by natural selection acting on random mutation, or any other unintelligent process. To falsify such a claim, a scientist could go into the laboratory, place a bacterial species lacking a flagellum under some selective pressure (for mobility, say), grow it for ten thousand generations, and see if a flagellum--or any equally complex
system--was produced. If that happened, my claims would be neatly disproven.

How about Professor Coyne’s concern that, if one system were shown to be the result of natural selection, proponents of ID could just claim that some other system was designed? I think the objection has little force. If natural selection were shown to be capable of producing a system of a certain degree of complexity, then the assumption would be that it could produce any other system of an equal or lesser degree of complexity. If Coyne demonstrated that the flagellum (which requires approximately forty gene products) could be produced by selection, I would be rather foolish to then assert that the blood clotting system (which consists of about twenty proteins) required intelligent design.”- Dr Michael Behe

And living organisms are the top of the IC mountain.

We observe genetic accidents breaking things not constructing useful, functional, multi-part systems.

But anyway how can we test DE/ NDE?

1- How can we test the premise that the bacterial flagellum evolved in a population that never had one via an accumulation of genetic accidents?

2- How can we test the premise that fish evolved into land animals via an accumulation of genetic accidents?

3- How can we test the premise that reptiles evolved into mammals via an accumulation of genetic accidents?