glideMixin которая является функцией.
    testString: 'assert(typeof glideMixin === "function", "Your code should declare a glideMixin variable that is a function.");'
  - text: ''
    testString: 'assert(typeof bird.glide === "function", "Your code should use the glideMixin on the bird object to give it the glide method.");'
  - text: Ваш код должен использовать glideMixin на объекте boat чтобы придать ему метод glide .
    testString: 'assert(typeof boat.glide === "function", "Your code should use the glideMixin on the boat object to give it the glide method.");'
```