# What is the meaning of Automatic in goodness of fit test?

I can't find what is the distribution corresponding to the default option in:

DistributionFitTest[data, Automatic, "HypothesisTestData"];


Is it N(0,1), uniform?

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By default DistributionFitTest attempts to test fit against the family of normal distributions. To test if the data is standard normal (i.e. N(0,1)) you would use.
DistributionFitTest[data, NormalDistribution[]]

There are examples that show this to be the case in the Properties & Relations section of the documentation for DistributionFitTest.