...to be considered a theory, then you had to have a testable hypothesis with concrete predictions and tests must yield results matching the predictions.
As far as I can tell, it is just a hypothesis based on observation. No testing or controls or anything.
Can you show me any repeatable experiments, with proper controls, for any of Darwin's (or others) work? If not, then it is a hypothesis and not a theory.
Absolutely.
The historial fossil record, DNA, etc. have been used as observational tests elevating the hypothesis to theory. Basically, stones have been thrown using the fossil record and nothing has bounced back saying "impossible." There does seem to be a problem with adequate controls, though. I would like to hear an evolutionary biologist talk about how he/she deals with this.
TennTradtion started the ball rolling on this. Your point of contention with evolution seems to be the predictive power of evolution as a theory and how individual evolutionary experiments maintain an adequate amount of control to maintain one independent variable.
First, I will start with quality control of the experiment. It is fairly easy to have quality control with an evolution experiment on the micro level. I don't believe you would object to this. I guess the real point of contention would be with those experiments at the macro level. That is a farce because evolution happens so slowly at the macro level that you cannot possibly have a comprehensive experiment. All you can do is observe.
Now, you can have what I call "observe and tinker". This is not quite experimental, because total evolution into a different species does not happen. We can only test certain aspects of the evolution theory, or as TennTradtion put it "components of the theory" (natural selection, genetic bottleneck, gene flow, etc). If you want an example of this "observe and tinker" on the macro level, look no further than the University of Tennessee. Dr. Riechert is the world's foremost authority on evolutionary behavior with respect to spiders. She has published extensively and flies out to desert (and all over the world) to conduct her experiments. Without going into detail, (it would mind-numbing and take forever) I can assure that extensive procedures are taken to insure the isolation of the independent variable. Of course, there is never a 100% chance of that happening, but then you could say that about any experiment of any kind.
Secondly, the predictive power of evolution has been shown many times. Every since Darwin, evolutionary biologist have stated that if a system (of any kind) is cut off from the whole, there will be certain evolutionary characteristics that will happen (some more than others depending on what kind of barrier is at hand). We have seen this over and over in various isolated islands, caves, man made structures like the Great Wall of China, or the disintegration of a limestone cave roof into an ecological treasure. There are many instances of this phenomena happening at various levels all over the world with predictive hypotheses being validated very time.
Moreover, evolutionary biologist when trying to map out the history of evolution constantly have to make predictions of a common ancestor between a group of organisms. They know relatively what the characteristics were of older organism (being primitive if they have not found an order link already) and the characteristics of the newer descendants of that common ancestor. From those facts, they are able to make fairly accurate predictions of what the common ancestor looked like, bone structure, habits, etc. Then, bam! Some palaeontologist finds the bones of this common ancestor and validates their predictions. There are many cases of this happening. I think the most famous example would be that of "Lucy".
Furthermore, with the advent of DNA testing, we are able to map out evolution and common ancestry with absolute precision. There were mistakes made by evolutionary biologist due to incomplete fossil records. They had to make an educated guess about some common ancestors that proved to be wrong. However, those are the minor details. The DNA mapping has proved conclusive on the theory itself and the mechanisms on which it operates.
I figured that your contention was with macro evolutionary techniques and not micro evolutionary techniques. Micro evolution happens every day in labs all over the world. I would hope that you can reconcile that our universe is governed by uniform natural laws which effect all levels of reality equally.
I hope this post helps elucidates your misgivings about the scientific criteria of macro evolution.