Hi Teo, This must be very very British because I've never heard this usage. It seems to me that if #1 is correct then the others would follow. We seem to be saying, Since it is a simple test , rather than If it is a simple test , or Assuming it is a simple test, or Given that it is a simple test .
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TeoHi Teo and Marius,
1. Granted that (=Because of the fact that) it is a simple test to perform, it should be easy to get results quickly.
#1 is quoted from Oxford Advanced Learner's Dictionary, 7th edition..