Nested Frisby.js Tests

Sometimes you have some HTTP calls that are dependent on others, like creating a new item and then checking to ensure that it exists and is returned from the API.

Here is a more complex test example with nested dependent Frisby tests with Frisby's Promise-style `then` method.

const frisby = require('frisby');
const Joi = frisby.Joi; // Frisby exposes Joi for convenience

describe('Posts', function () {
  it('should return all posts and first post should have comments', function () {
    return frisby.get('http://jsonplaceholder.typicode.com/posts')
      .expect('status', 200)
      .expect('jsonTypes', '*', {
        userId: Joi.number(),
        id: Joi.number(),
        title: Joi.string(),
        body: Joi.string()
      })
      .then(function (res) { // res = FrisbyResponse object
        let postId = res.json[0].id;

        // Get first post's comments
        // RETURN the FrisbySpec object so function waits on it to finish - just like a Promise chain
        return frisby.get('http://jsonplaceholder.typicode.com/posts/' + postId + '/comments')
          .expect('status', 200)
          .expect('json', '*', {
            postId: postId
          })
          .expect('jsonTypes', '*', {
            postId: Joi.number(),
            id: Joi.number(),
            name: Joi.string(),
            email: Joi.string().email(),
            body: Joi.string()
          });
      });
  });
});

```

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