ServerSideMock

Copyright (c) 2015, Lawrence S. Maccherone, Jr.

Mock for testing Stored Procedures in Microsoft Azure's DocumentDB

Microsoft Azure's DocumentDB is a great PaaS NoSQL database. My absolute favorite feature is that you can write stored procedures in JavaScript (CoffeeScript in my case) but it's missing a mature way to test your stored procedures. Luckily, JavaScript runs just fine on node.js so your stored procedures will run there with mock data.

This package implements a thin mock for testing stored procedures.

Source code

• Source Repository

Features

Working

ServerSideMock implements many of the methods in the DocumentDB's Collection class including:

• getResponse.setBody
• getSelfLink
• createDocument
• readDocument
• replaceDocument
• deleteDocument
• queryDocuments
• readDocuments

ClientSideMock is fairly limited at this point. It only implements the executeNext(), hasMoreResults(), and toArray() methods for reads() or querys() calls.

Unimplemented

• Attachment operations (server-side) - should be easy to implement following the patterns for document operations
• Other server-side read... or query... should be easy to implement with class self-modification
• Other server-side methods. Can follow pattern for server-side ones
• Right now, you pretty much have to pre-configure the mock with every response that you expect to get from DocumentDB operations. It would be nice if it behaved more like the real thing and saved documents. I'd need to find an in process database that supported simple SQL and that might not support all the features of DocumentDB's query language. If anyone knows of something like this, please let me know.

Install

npm install -save documentdb-mock

Usage

You can look at the code in the test and stored-procedure folders of documentdb-utils to see how to use ServerSideMock.

Basically:

1. Create a module to hold one or more stored procedures. You simply need to exports your function(s).
2. Create your mock with mock = new ServerSideMock('path/to/stored/procedure')
3. Set mock.nextResources, mock.nextError, mock.nextOptions, and/or mock.nextCollectionOperationQueued to control the response that your stored procedure will see to the next collection operation. Note, nextCollectionOperationQueued is the Boolean that is immediately returned from collection operation calls. Setting this to false allows you to test situations where your stored procedure is defensively timed out by DocumentDB.
4. Call your stored procedure like it was a function from within your test with mock.package.your-stored-procedure()
5. Inspect mock.lastBody to see the output of your stored procedure. You can also inspect mock.lastResponseOptions mock.lastCollectionLink, and mock.lastQueryFilter to see the last values that your stored procedure sent into the most recent collection operation.

As an example, here is a stored procedure that will count all of the documents in a collection:

count = (memo) ->

    collection = getContext().getCollection()

    unless memo?
    memo = {}
    unless memo.count?
    memo.count = 0
    unless memo.continuation?
    memo.continuation = null
    unless memo.example?
    memo.example = null

    stillQueuingOperations = true

    query = () ->

    if stillQueuingOperations
        responseOptions =
        continuation: memo.continuation
        pageSize: 1000

        if memo.filterQuery?
        stillQueuingOperations = collection.queryDocuments(collection.getSelfLink(), memo.filterQuery, responseOptions, onReadDocuments)
        else
        stillQueuingOperations = collection.readDocuments(collection.getSelfLink(), responseOptions, onReadDocuments)

    setBody()

    onReadDocuments = (err, resources, options) ->
    if err
        throw err

    count = resources.length
    memo.count += count
    memo.example = resources[0]
    if options.continuation?
        memo.continuation = options.continuation
        query()
    else
        memo.continuation = null
        setBody()

    setBody = () ->
    getContext().getResponse().setBody(memo)

    query()
    return memo

exports.count = count

Here is a simple nodeunit test of the above stored procedure:

{ServerSideMock} = require('documentdb-mock')
mock = new ServerSideMock('./stored-procedures/countDocuments')

exports.countTest =

  basicTest: (test) ->
    mock.nextResources = [
      {id: 1, value: 10}
      {id: 2, value: 20}
      {id: 3, value: 30}
    ]

    mock.package.count()

    test.equal(mock.lastBody.count, 3)
    test.ok(!mock.lastBody.continuation?)

    test.done()
    

If you want to test the ability of a stored procedure to be restarted:

  testContinuation: (test) ->
    firstBatch = [
      {id: 1, value: 10}
      {id: 2, value: 20}
    ]
    secondBatch = [
      {id: 3, value: 30}
      {id: 4, value: 40}
    ]
    mock.resourcesList = [firstBatch, secondBatch]

    firstOptions = {continuation: 'ABC123'}
    secondOptions = {}
    mock.optionsList = [firstOptions, secondOptions]

    mock.package.count()

    test.equal(mock.lastBody.count, 4)
    test.ok(!mock.lastBody.continuation?)

    # Note, lastResponseOptions is NOT the options returned from a collection operation. 
    # It is the last one you sent in.
    test.equal(mock.lastOptions.continuation, 'ABC123')

    test.done()
    

Here's an example of testing a stored procedure being forceably timed out by DocumentDB and then restarted by you:

  testTimeout: (test) ->
    firstBatch = [
      {id: 1, value: 10}
      {id: 2, value: 20}
    ]
    secondBatch = [
      {id: 3, value: 30}
      {id: 4, value: 40}
    ]
    mock.resourcesList = [firstBatch, secondBatch]

    firstOptions = {continuation: 'ABC123'}
    secondOptions = {}
    mock.optionsList = [firstOptions, secondOptions]

    mock.collectionOperationQueuedList = [true, false, true]

    mock.package.count()

    memo = mock.lastBody

    test.equal(memo.count, 2)
    test.equal(memo.continuation, 'ABC123')

    mock.package.count(memo)

    test.equal(memo.count, 4)

    test.done()

Changelog

• 0.3.1 - 2016-05-25 - Now clones inputs so no side effects
• 0.3.0 - 2015-11-12 - Backward breaking Split into ServerSideMock and ClientSideMock
• 0.2.0 - 2015-11-02 - Backward breaking Moved all example sprocs to documentdb-utils
• 0.1.4 - 2015-07-09 - Now correctly supports missing options parameter. Also fixed createVariedDocuments to use callback, which exposed the problem with the optional options parameter.
• 0.1.3 - 2015-07-07 - Lots of little fixes found when using to test documentdb-lumenize
• 0.1.2 - 2015-06-30 - Fixed src examples broken when this was split from documentdb-utils
• 0.1.1 - 2015-06-29 - Minor documentation tweaks
• 0.1.0 - 2015-06-28 - Initial release

Contributing to documentdb-mock

I'd be willing to accept pull requests implementing any unimplemented functionality listed as "Unimplemented" above. Also, I'd love to hear feedback from other people using it.

MIT License

Copyright (c) 2015 Lawrence S. Maccherone, Jr.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.