Kaza, that's not precisely true. Evolutionary theory makes many predictions that we can test, and we do test them. Now, most of what evolutionary theory can interestingly explain happened a long time ago, and it's true that it's difficult to find clear-cut evidence of what happened back then (though it's always seemed to me that the fossil record pretty strongly backed up theories of natural selection and slow change over time).
However, we assume (and all of us do this) that natural laws don't change over time (with the possible exception of the very beginning). Evolution makes a great many predictions about what we'll find now and in the future, and we repeatedly are able to confirm these predictions.
Similarly, it's hard to show definitively that gravity was the mechanism by which things fell down in the age of the dinosaurs. We don't have solid proof that the force things experienced was a function of their masses, etc. However, because we have so much evidence for gravity in recent history, we believe that it makes sense to assume that things that fell in the distant past were probably under the influence of gravity.
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