bddrest

Toolchain to define and verify REST API in BDD.

Table of Contents

• Quick start
  • Writing tests
  • Dumping a Story
    • Auto Dumping
  • Markdown
• Command Line Interface
  • Enabling the bash autocompletion for bddrest

Quick start

Writing tests

Using Given, when, functions as you see in the example below, you can determine and assert the behaviour of your REST API.

The story, response, status objects are some proxies for currently writing story(inside the with Given( ... ): context) and it's response. and the last response after a Given and or when.

import re
import sys
import json

from bddrest.authoring import Given, when, response, status


def wsgi_application(environ, start_response):
    path = environ['PATH_INFO']
    if path.endswith('/None'):
        start_response(
            '404 Not Found',
            [('Content-Type', 'text/plain;charset=utf-8')]
        )
        yield b''
    else:
        start_response(
            '200 OK',
            [('Content-Type', 'application/json;charset=utf-8')]
        )
        result = json.dumps(dict(
            foo='bar'
        ))
        yield result.encode()


with Given(
        wsgi_application,
        title='Quickstart!',
        path='/books/id: 1',
        as_='visitor') as story:

    assert status == 200
    assert status == '200 OK'
    assert 'foo' in response.json
    assert response.json['foo'] == 'bar'

    when(
        'Trying invalid book id',
        path_parameters={'id': None}
    )

    assert response.status == 404

Dumping a Story

story.dumps()

Produces:

base_call:
  as_: visitor
  description: As a member I have to POST a book to the library.
  form:
    name: BDD Book
  query:
    a: b
  response:
    headers:
    - 'Content-Type: application/json;charset=utf-8'
    json:
      foo: bar
    status: 200 OK
  title: Posting a book
  path: /books/:id
  path_parameters:
    id: '1'
  verb: GET
calls:
- response:
    headers:
    - 'Content-Type: text/plain;charset=utf-8'
    status: 404 Not Found
  title: Trying invalid book id
  path_parameters:
    id: None

You may load the story again from this yaml with Story.loads(yaml).

There are two additional methods available to dump and load to and from a file: story.load(file) and story.dump(file)

Auto Dumping

You may pass the autodump argument of the Given function to configure the auto-dumping:

:param autodump: A file-like object to write dumped story.
                 Default is `None`, means autodump is disabled by default.

Auto Documentation

You may pass the autodoc argument of the Given function to configure the auto-documentation:

:param autodoc: A file-like object to write documentation.
                Default is `None`, meana autodoc is disabled by default.
:param autodoc_format: Either ``markdown`` or ``html``. default is
                       ``markdown``.

Markdown

You can use story.document([formatter_factory=MarkdownFormatter]) to generate documentation in arbitrary format for example: Markdown.

There is also a CLI to do this:

bddrest document < story.yml > story.md

## Posting a book

### GET /books/:id

As a member I have to POST a book to the library.

### Path Parameters

Name | Example
--- | ---
id | 1

### Query Strings

Name | Example
--- | ---
a | b

### Form

Name | Example
--- | ---
name | BDD Book

### Response: 200 OK

#### Headers

* Content-Type: application/json;charset=utf-8

#### Body

```json
{"foo": "bar"}
```

## WHEN: Trying invalid book id

### Path Parameters

Name | Example
--- | ---
id | None

### Response: 404 Not Found

#### Headers

* Content-Type: text/plain;charset=utf-8

Command Line Interface

After installing the project a command named bddrest will be available.

bddrest -h

Enabling the bash autocompletion for bddrest

Add this into your .bashrc and or $VIRTUAL_ENV/bin/postactivate.

eval "$(register-python-argcomplete bddrest)"