Plot hole: When the survivors break into the Umbrella compound, Alice helps load survivors onto the helicopter. The helicopter portrayed has a max occupancy of 6, and somehow Alice manages to squeeze 20+ survivors onto the helicopter, with no problems whatsoever. (01:11:05)

Resident Evil: Extinction (2007)
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Directed by: Russell Mulcahy
Starring: Milla Jovovich, Ali Larter, Iain Glen, Oded Fehr
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Carlos Olivera: Just promise me one thing. When you get down there.
Alice: Consider it done.
Trivia: The scene where a zombie appears to be "domesticated" is a clear reference to the zombie-character "Bub" from George A. Romero's film "Day of the Dead." "Resident Evil: Extinction" also includes several other more subtle references to that film as well.
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Chosen answer: The reason that the cloned alices were put through the tests was their attempt to get a "perfect" clone of her. They knew that Alice was the key to taking back the zombie infestation, so they were trying to get the "perfect" clone. The perfect clone would have all of her memories and reactions, so they put the clones through that testing facility. If she made it out alive, then she was the perfect clone. If she didn't, then it was back to the drawing board.
Nick Bylsma