Mechanical Testing of screw driver

Hello if there's any of you that can enlighten me about these topics you are indeed the most scholarly of all men.
For testing the reliability of a screwdriver, what are the tests used to test these parameters:

1- Brittleness or toughness of the tip screwdriver

2- Tightness of the connection between the shank and the handle screwdriver

3- The limit of bending steel will stand without being plastically deformed screwdriver

4- How much pressure the tip will stand without breaking

5- Twisting effort required to drive the screwdriver

6- The relation between the strength of the tip and the strength of the shank

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