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Two key aspects of extreme programming (XP) are unit testing and merciless refactoring. Given the fact that the ideal test code / production code ratio approaches 1:1, it is not surprising that unit tests are being refactored. We found that refactoring test code is di erent from refactoring production code in two ways: (1) there is a distinct set of bad(More)
Let Tn denote the set of unrooted labeled trees of size n and let M be a particular (finite, unlabeled) tree. Assuming that every tree of Tn is equally likely, it is shown that the limiting distribution as n goes to infinity of the number of occurrences of M as an induced subtree is asymptotically normal with mean value and variance asymptotically(More)
Let Tn denote the set of unrooted unlabeled trees of size n and let M be a particular (finite) tree. Assuming that every tree of Tn is equally likely, it is shown that the number of occurrences Xn ofM as an induced sub-tree satisfies EXn ∼ μn and VarXn ∼ σn for some (computable) constants μ > 0 and σ ≥ 0. Furthermore, if σ > 0 then (Xn−EXn)/ √ VarXn(More)
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