[Vuejs]-Testing Vuetify v-checkbox with Vue test utils 2 – wrapper.setValue() cannot be called on V-CHECKBOX

You could try the following:

const checkboxA = wrapper.find('.checkboxA').get('input')
checkboxA.setChecked()

or you could attach a test specific attribute like data-test and it seems the attribute will be appended directly to the input tag so you could do:

const checkboxA = wrapper.find('[data-test="checkboxA"]')
checkboxA.setChecked()