message: test: fix assertion
diff: @@ -512,7 +512,7 @@ describe('parser', () => {
  it('empty v-bind expression', () => {
  parse('<div :empty-msg=""></div>', baseOptions)
  - expect('The value for a v-bind expression cannot be empty. Found in "empty-msg"').toHaveBeenWarned()
  + expect('The value for a v-bind expression cannot be empty. Found in "v-bind:empty-msg"').toHaveBeenWarned()
  })
  // #6887
  