FormsySpec: test that `onChange` is called only once
FormsySpec: test that `onChange` is called only once

bitgaming/formsy-react,christianalfoni/formsy-react,sdemjanenko/formsy-react,meraki/mki-formsy-react,track0x1/formsy-react,optiopay/optiopay-form,gullitmiranda/formsy-react,hanbar/formsy-react,aesopwolf/formsy,etshi/optiopay-form,sdemjanenko/formsy-react