From Longman Dictionary of Contemporary Englishtestabletest‧a‧ble /ˈtestəbəl/ adjective testable things can be tested I don’t think this theory is testable.
Examples from the Corpus
testable• But it is intended to be testable.• Modifications or additions to the protective belt of a research programme must be independently testable.• What are the empirically testable implications of our model?• Economics is the study of such choices, and the developing of testable models to explain such behavior.• They were no more testable than the claims of Paley and the other advocates of natural theology. 