Nock

Nock is an HTTP mocking and expectations library for Node.js

Nock can be used to test modules that perform HTTP requests in isolation.

For instance, if a module performs HTTP requests to a CouchDB server or makes HTTP requests to the Amazon API, you can test that module in isolation.

Table of Contents

Install
Use
Expectations
Logging
Restoring
Turning Nock Off (experimental!)
Enable/Disable real HTTP request
Recording
How does it work?
Debugging
PROTIP
License

Install

$ npm install nock

Use

On your test, you can setup your mocking object like this:

var nock = require('nock');

var couchdb = nock('http://myapp.iriscouch.com')
                .get('/users/1')
                .reply(200, {
                  _id: '123ABC',
                  _rev: '946B7D1C',
                  username: 'pgte',
                  email: 'pedro.teixeira@gmail.com'
                 });

This setup says that we will intercept every HTTP call to http://myapp.iriscouch.com.

It will intercept an HTTP GET request to '/users/1' and reply with a status 200, and the body will contain a user representation in JSON.

Then the test can call the module, and the module will do the HTTP requests.

READ THIS! (1) - About interceptors

When you setup an interceptor for an URL and that interceptor is used, it is removed from the interceptor list. This means that you can intercept 2 or more calls to the same URL and return different things on each of them. It also means that you must setup one interceptor for each request you are going to have, otherwise nock will throw an error because that URL was not present in the interceptor list.

READ THIS! (2) - About enableNetConnect

By the time you require nock, it will disable all HTTP requests, except for the ones that you specifically create a nock scope for.

To allow all HTTP requests, call nock.enableNetConnect.

Specifying request body

You can specify the request body to be matched as the second argument to the get, post, put or delete specifications like this:

var scope = nock('http://myapp.iriscouch.com')
                .post('/users', {
                  username: 'pgte',
                  email: 'pedro.teixeira@gmail.com'
                })
                .reply(201, {
                  ok: true,
                  id: '123ABC',
                  rev: '946B7D1C'
                });

The request body can be a string, a RegExp, a JSON object or a function.

var scope = nock('http://myapp.iriscouch.com')
                .post('/users', /email=.?@gmail.com/gi)
                .reply(201, {
                  ok: true,
                  id: '123ABC',
                  rev: '946B7D1C'
                });

If the request body is a function, return true if it should be considered a match:

var scope = nock('http://myapp.iriscouch.com')
                .post('/users', function(body) {
                  return body.id === '123ABC';
                })
                .reply(201, {
                  ok: true,
                  id: '123ABC',
                  rev: '946B7D1C'
                });

Specifying replies

You can specify the return status code for a path on the first argument of reply like this:

var scope = nock('http://myapp.iriscouch.com')
                .get('/users/1')
                .reply(404);

You can also specify the reply body as a string:

var scope = nock('http://www.google.com')
                .get('/')
                .reply(200, 'Hello from Google!');

or as a JSON-encoded object:

var scope = nock('http://myapp.iriscouch.com')
                .get('/')
                .reply(200, {
                  username: 'pgte',
                  email: 'pedro.teixeira@gmail.com',
                  _id: '4324243fsd'
                });

or even as a file:

var scope = nock('http://myapp.iriscouch.com')
                .get('/')
                .replyWithFile(200, __dirname + '/replies/user.json');

Instead of an object or a buffer you can also pass in a callback to be evaluated for the value of the response body:

var scope = nock('http://www.google.com')
   .filteringRequestBody(/.*/, '*')
   .post('/echo', '*')
   .reply(201, function(uri, requestBody) {
     return requestBody;
   });

An asychronous function that gets an error-first callback as last argument also works:

var scope = nock('http://www.google.com')
   .filteringRequestBody(/.*/, '*')
   .post('/echo', '*')
   .reply(201, function(uri, requestBody, cb) {
     fs.readFile('cat-poems.txt' , cb); // Error-first callback
   });

You can also return the status code and body using just one function:

var scope = nock('http://www.google.com')
   .filteringRequestBody(/.*/, '*')
   .post('/echo', '*')
   .reply(function(uri, requestBody) {
     return [201, 'THIS IS THE REPLY BODY'];
   });

or, use an error-first callback that also gets the status code:

var scope = nock('http://www.google.com')
   .filteringRequestBody(/.*/, '*')
   .post('/echo', '*')
   .reply(function(uri, requestBody, cb) {
     setTimeout(function() {
       cb(null, [201, 'THIS IS THE REPLY BODY'])
     }, 1e3);
   });

A Stream works too:

var scope = nock('http://www.google.com')
   .get('/cat-poems')
   .reply(200, function(uri, requestBody) {
     return fs.createReadStream('cat-poems.txt');
   });

Access original request and headers

If you're using the reply callback style, you can access the original client request using this.req like this:

var scope = nock('http://www.google.com')
   .get('/cat-poems')
   .reply(function(uri, requestBody) {
     console.log('path:', this.req.path);
     console.log('headers:', this.req.headers);
     // ...
   });

Replying with errors

You can reply with an error like this:

nock('http://www.google.com')
   .get('/cat-poems')
   .replyWithError('something awful happened');

Specifying headers

Header field names are case-insensitive

Per HTTP/1.1 4.2 Message Headers specification, all message headers are case insensitive and thus internally Nock uses lower-case for all field names even if some other combination of cases was specified either in mocking specification or in mocked requests themselves.

Specifying Request Headers

You can specify the request headers like this:

var scope = nock('http://www.example.com', {
      reqheaders: {
        'authorization': 'Basic Auth'
      }
    })
    .get('/')
    .reply(200);

If reqheaders is not specified or if host is not part of it, Nock will automatically add host value to request header.

If no request headers are specified for mocking then Nock will automatically skip matching of request headers. Since host header is a special case which may get automatically inserted by Nock, its matching is skipped unless it was also specified in the request being mocked.

You can also have Nock fail the request if certain headers are present:

var scope = nock('http://www.example.com', {
    badheaders: ['cookie', 'x-forwarded-for']
  })
  .get('/')
  .reply(200);

When invoked with this option, Nock will not match the request if any of the badheaders are present.

Basic authentication can be specified as follows:

var scope = nock('http://www.example.com')
    .get('/')
    .basicAuth({
      user: 'john',
      pass: 'doe'
    })
    .reply(200);

Specifying Reply Headers

You can specify the reply headers like this:

var scope = nock('http://www.headdy.com')
   .get('/')
   .reply(200, 'Hello World!', {
     'X-My-Headers': 'My Header value'
   });

Default Reply Headers

You can also specify default reply headers for all responses like this:

var scope = nock('http://www.headdy.com')
  .defaultReplyHeaders({
    'X-Powered-By': 'Rails',
    'Content-Type': 'application/json'
  })
  .get('/')
  .reply(200, 'The default headers should come too');

Including Content-Length Header Automatically

When using scope.reply() to set a response body manually, you can have the Content-Length header calculated automatically.

var scope = nock('http://www.headdy.com')
  .replyContentLength()
  .get('/')
  .reply(200, { hello: 'world' });

NOTE: this does not work with streams or other advanced means of specifying the reply body.

Including Date Header Automatically

You can automatically append a Date header to your mock reply:

var scope = nock('http://www.headdy.com')
  .replyDate(new Date(2015, 0, 1)) // defaults to now, must use a Date object
  .get('/')
  .reply(200, { hello: 'world' });

HTTP Verbs

Nock supports any HTTP verb, and it has convenience methods for the GET, POST, PUT, HEAD, DELETE, PATCH and MERGE HTTP verbs.

You can intercept any HTTP verb using .intercept(path, verb [, requestBody [, options]]):

scope('http://my.domain.com')
  .intercept('/path', 'PATCH')
  .reply(304);

Support for HTTP and HTTPS

By default nock assumes HTTP. If you need to use HTTPS you can specify the https:// prefix like this:

var scope = nock('https://secure.my.server.com')
   // ...

Non-standard ports

You are able to specify a non-standard port like this:

var scope = nock('http://my.server.com:8081')
  ...

Repeat response n times

You are able to specify the number of times to repeat the same response.

nock('http://zombo.com').get('/').times(4).reply(200, 'Ok');

http.get('http://zombo.com/'); // respond body "Ok"
http.get('http://zombo.com/'); // respond body "Ok"
http.get('http://zombo.com/'); // respond body "Ok"
http.get('http://zombo.com/'); // respond body "Ok"
http.get('http://zombo.com/'); // respond with zombo.com result

Sugar syntax

nock('http://zombo.com').get('/').once().reply(200, 'Ok');
nock('http://zombo.com').get('/').twice().reply(200, 'Ok');
nock('http://zombo.com').get('/').thrice().reply(200, 'Ok');

Delay the response

You are able to specify the number of milliseconds that your reply should be delayed.

nock('http://my.server.com')
  .get('/')
  .delay(2000) // 2 seconds
  .reply(200, '<html></html>')

NOTE: the 'response' event will occur immediately, but the IncomingMessage not emit it's 'end' event until after the delay.

Delay the connection

You are able to specify the number of milliseconds that your connection should be delayed.

nock('http://my.server.com')
  .get('/')
  .delayConnection(2000) // 2 seconds
  .reply(200, '<html></html>')

Socket timeout

You are able to specify the number of milliseconds that your connection should be idle, to simulate a socket timeout.

nock('http://my.server.com')
  .get('/')
  .socketDelay(2000) // 2 seconds
  .reply(200, '<html></html>')

To test a request like the following:

req = http.request('http://my.server.com', function(res) {
  ...
});
req.setTimeout(1000, function() {
  req.abort();
});
req.end();

NOTE: the timeout will be fired immediately, and will not leave the simulated connection idle for the specified period of time.

Chaining

You can chain behaviour like this:

var scope = nock('http://myapp.iriscouch.com')
                .get('/users/1')
                .reply(404)
                .post('/users', {
                  username: 'pgte',
                  email: 'pedro.teixeira@gmail.com'
                })
                .reply(201, {
                  ok: true,
                  id: '123ABC',
                  rev: '946B7D1C'
                })
                .get('/users/123ABC')
                .reply(200, {
                  _id: '123ABC',
                  _rev: '946B7D1C',
                  username: 'pgte',
                  email: 'pedro.teixeira@gmail.com'
                });

Scope filtering

You can filter the scope (protocol, domain and port through) of a nock through a function. This filtering functions is defined at the moment of defining the nock's scope through its optional options parameters:

This can be useful, for instance, if you have a node module that randomly changes subdomains to which it sends requests (e.g. Dropbox node module is like that)

var scope = nock('https://api.dropbox.com', {
    filteringScope: function(scope) {
      return /^https:\/\/api[0-9]*.dropbox.com/.test(scope);
    }
  })
  .get('/1/metadata/auto/Photos?include_deleted=false&list=true')
  .reply(200);

Path filtering

You can also filter the URLs based on a function.

This can be useful, for instance, if you have random or time-dependent data in your URL.

You can use a regexp for replacement, just like String.prototype.replace:

var scope = nock('http://api.myservice.com')
                .filteringPath(/password=[^&]*/g, 'password=XXX')
                .get('/users/1?password=XXX')
                .reply(200, 'user');

Or you can use a function:

var scope = nock('http://api.myservice.com')
                .filteringPath(function(path) {
                   return '/ABC';
                 })
                .get('/ABC')
                .reply(200, 'user');

Note that scope.filteringPath is not cummulative: it should only be used once per scope.

Request Body filtering

You can also filter the request body based on a function.

This can be useful, for instance, if you have random or time-dependent data in your request body.

You can use a regexp for replacement, just like String.prototype.replace:

var scope = nock('http://api.myservice.com')
                .filteringRequestBody(/password=[^&]*/g, 'password=XXX')
                .post('/users/1', 'data=ABC&password=XXX')
                .reply(201, 'OK');

Or you can use a function to transform the body:

var scope = nock('http://api.myservice.com')
                .filteringRequestBody(function(body) {
                   return 'ABC';
                 })
                .post('/', 'ABC')
                .reply(201, 'OK');

Request Headers Matching

If you need to match requests only if certain request headers match, you can.

var scope = nock('http://api.myservice.com')
                .matchHeader('accept', 'application/json')
                .get('/')
                .reply(200, {
                  data: 'hello world'
                })

You can also use a regexp for the header body.

var scope = nock('http://api.myservice.com')
                .matchHeader('User-Agent', /Mozilla\/.*/)
                .get('/')
                .reply(200, {
                  data: 'hello world'
                })

You can also use a function for the header body.

var scope = nock('http://api.myservice.com')
                .matchHeader('content-length', function (val) {
                  return val >= 1000;
                })
                .get('/')
                .reply(200, {
                  data: 'hello world'
                })

Allow unmocked requests on a mocked hostname

If you need some request on the same host name to be mocked and some others to really go through the HTTP stack, you can use the allowUnmocked option like this:

options = {allowUnmocked: true};
var scope = nock('http://my.existing.service.com', options)
  .get('/my/url')
  .reply(200, 'OK!');

 // GET /my/url => goes through nock
 // GET /other/url => actually makes request to the server

Expectations

Every time an HTTP request is performed for a scope that is mocked, Nock expects to find a handler for it. If it doesn't, it will throw an error.

Calls to nock() return a scope which you can assert by calling scope.done(). This will assert that all specified calls on that scope were performed.

Example:

var google = nock('http://google.com')
                .get('/')
                .reply(200, 'Hello from Google!');

// do some stuff

setTimeout(function() {
  google.done(); // will throw an assertion error if meanwhile a "GET http://google.com" was not performed.
}, 5000);

.isDone()

You can also call isDone(), which will return a boolean saying if all the expectations are met or not (instead of throwing an exception);

.cleanAll()

You can cleanup all the prepared mocks (could be useful to cleanup some state after a failed test) like this:

nock.cleanAll();

.persist()

You can make all the interceptors for a scope persist by calling .persist() on it:

var scope = nock('http://persisssists.con')
  .persist()
  .get('/')
  .reply(200, 'Persisting all the way');

.pendingMocks()

If a scope is not done, you can inspect the scope to infer which ones are still pending using the scope.pendingMocks() function:

if (!scope.isDone()) {
  console.error('pending mocks: %j', scope.pendingMocks());
}

Logging

Nock can log matches if you pass in a log function like this:

var google = nock('http://google.com')
                .log(console.log)
                ...

Restoring

You can restore the HTTP interceptor to the normal unmocked behaviour by calling:

nock.restore();

note: restore does not clear the interceptor list. Use nock.cleanAll() if you expect the interceptor list to be empty.

Turning Nock Off (experimental!)

You can bypass Nock completely by setting NOCK_OFF environment variable to "true".

This way you can have your tests hit the real servers just by switching on this environment variable.

$ NOCK_OFF=true node my_test.js

Enable/Disable real HTTP request

As default, if you do not mock a host, a real HTTP request will do, but sometimes you should not permit real HTTP request, so...

For disable real http request.

nock.disableNetConnect();

So, if you try to request any host not 'nocked', it will thrown an NetConnectNotAllowedError.

nock.disableNetConnect();
http.get('http://google.com/');
// this code throw NetConnectNotAllowedError with message:
// Nock: Not allow net connect for "google.com:80"

For enabled real HTTP requests.

nock.enableNetConnect();

You could restrict real HTTP request...

// using a string
nock.enableNetConnect('amazon.com');

// or a RegExp
nock.enableNetConnect(/(amazon|github).com/);

http.get('http://www.amazon.com/');
http.get('http://github.com/'); // only for second example

// This request will be done!
http.get('http://google.com/');
// this will throw NetConnectNotAllowedError with message:
// Nock: Not allow net connect for "google.com:80"

Recording

This is a cool feature:

Guessing what the HTTP calls are is a mess, specially if you are introducing nock on your already-coded tests.

For these cases where you want to mock an existing live system you can record and playback the HTTP calls like this:

nock.recorder.rec();
// Some HTTP calls happen and the nock code necessary to mock
// those calls will be outputted to console

Recording relies on intercepting real requests and answers and then persisting them for later use.

ATTENTION!: when recording is enabled, nock does no validation.

`dont_print` option

If you just want to capture the generated code into a var as an array you can use:

nock.recorder.rec({
  dont_print: true
});
// ... some HTTP calls
var nockCalls = nock.recorder.play();

The nockCalls var will contain an array of strings representing the generated code you need.

Copy and paste that code into your tests, customize at will, and you're done!

(Remember that you should do this one test at a time).

`output_objects` option

In case you want to generate the code yourself or use the test data in some other way, you can pass the output_objects option to rec:

nock.recorder.rec({
  output_objects: true
});
// ... some HTTP calls
var nockCallObjects = nock.recorder.play();

The returned call objects have the following properties:

scope - the scope of the call including the protocol and non-standard ports (e.g. 'https://github.com:12345')
method - the HTTP verb of the call (e.g. 'GET')
path - the path of the call (e.g. '/pgte/nock')
body - the body of the call, if any
status - the HTTP status of the reply (e.g. 200)
response - the body of the reply which can be a JSON, string, hex string representing binary buffers or an array of such hex strings (when handling content-encoded in reply header)
headers - the headers of the reply
reqheader - the headers of the request

If you save this as a JSON file, you can load them directly through nock.load(path). Then you can post-process them before using them in the tests for example to add them request body filtering (shown here fixing timestamps to match the ones captured during recording):

nocks = nock.load(pathToJson);
nocks.forEach(function(nock) {
  nock.filteringRequestBody = function(body) {
    if(typeof(body) !== 'string') {
      return body;
    }

    return body.replace(/(timestamp):([0-9]+)/g, function(match, key, value) {
      return key + ':timestampCapturedDuringRecording'
    });
  };
});

Alternatively, if you need to pre-process the captured nock definitions before using them (e.g. to add scope filtering) then you can use nock.loadDefs(path) and nock.define(nockDefs). Shown here is scope filtering for Dropbox node module which constantly changes the subdomain to which it sends the requests:

//  Pre-process the nock definitions as scope filtering has to be defined before the nocks are defined (due to its very hacky nature).
var nockDefs = nock.loadDefs(pathToJson);
nockDefs.forEach(function(def) {
  //  Do something with the definition object e.g. scope filtering.
  def.options = def.options || {};
  def.options.filteringScope = function(scope) {
    return /^https:\/\/api[0-9]*.dropbox.com/.test(scope);
  };
}

//  Load the nocks from pre-processed definitions.
var nocks = nock.define(nockDefs);

`enable_reqheaders_recording` option

Recording request headers by default is deemed more trouble than its worth as some of them depend on the timestamp or other values that may change after the tests have been recorder thus leading to complex postprocessing of recorded tests. Thus by default the request headers are not recorded.

The genuine use cases for recording request headers (e.g. checking authorization) can be handled manually or by using enable_reqheaders_recording in recorder.rec() options.

nock.recorder.rec({
  dont_print: true,
  output_objects: true,
  enable_reqheaders_recording: true
});

Note that even when request headers recording is enabled Nock will never record user-agent headers. user-agent values change with the version of Node and underlying operating system and are thus useless for matching as all that they can indicate is that the user agent isn't the one that was used to record the tests.

`logging` option

Nock will print using console.log by default (assuming that dont_print is false). If a different function is passed into logging, nock will send the log string (or object, when using output_objects) to that function. Here's a basic example.

var appendLogToFile = function(content) {
  fs.appendFile('record.txt', content);
}
nock.recorder.rec({
  logging: appendLogToFile,
});

`use_separator` option

By default, nock will wrap it's output with the separator string <<<<<<-- cut here -->>>>>> before and after anything it prints, whether to the console or a custom log function given with the logging option.

To disable this, set use_separator to false.

nock.recorder.rec({
  use_separator: false
});

.removeInterceptor()

This allows removing a specific interceptor for a url. It's useful when there's a list of common interceptors but one test requires one of them to behave differently.

Examples:

nock.removeInterceptor({
  hostname : 'localhost',
  path : '/mockedResource'
});

nock.removeInterceptor({
  hostname : 'localhost',
  path : '/login'
  method: 'POST'
  proto : 'https'
});

Nock Back

fixture recording support and playback

Setup

**You must specify a fixture directory before using, for example:

In your test helper

var nockBack = require('nock').back;

nockBack.fixtures = '/path/to/fixtures/';
nockBack.setMode('record');

Options

nockBack.fixtures : path to fixture directory
nockBack.setMode() : the mode to use

Usage

By default if the fixture doesn't exist, a nockBack will create a new fixture and save the recorded output for you. The next time you run the test, if the fixture exists, it will be loaded in.

The this context of the call back function will be have a property scopes to access all of the loaded nock scopes

  var nockBack = require('nock').back;

  nockBack.fixtures = '/path/to/fixtures/'; //this only needs to be set once in your test helper

  var before = function (scope) {
    scope.filteringRequestBody = function(body) {
      if(typeof(body) !== 'string') {
        return body;
      }

      return body.replace(/(timestamp):([0-9]+)/g, function(match, key, value) {
        return key + ':timestampCapturedDuringRecording'
      });

    }
  }

  nockBack('someFixture.json', {before: before}, function (nockDone) {

    http.get('http://zombo.com/').end(); // respond body "Ok"
    this.assertScopesFinished(); //throws an exception if all nocks in fixture were not satisfied

    nockDone();

  });

  nockBack('someFixture.json', function (nockDone) {

    http.get('http://zombo.com/').end(); // respond body "Ok"
    http.get('http://zombo.com/').end(); // throws exeption because someFixture.json only had one call

    //never gets here
    nockDone();

  });

Options

As an optional second parameter you can pass the following options

before: a preprocessing function, gets called before nock.define
after: a postprocessing function, gets called after nock.define

Modes

to set the mode call nockBack.setMode(mode) or run the tests with the NOCK_BACK_MODE environment variable set before loading nock. If the mode needs to be changed programatically, the following is valid: nockBack.setMode(nockBack.currentMode)

wild: all requests go out to the internet, dont replay anything, doesnt record anything
dryrun: The default, use recorded nocks, allow http calls, doesnt record anything, useful for writing new tests
record: use recorded nocks, record new nocks
lockdown: use recorded nocks, disables all http calls even when not nocked, doesnt record

How does it work?

Nock works by overriding Node's http.request function. Also, it overrides http.ClientRequest too to cover for modules that use it directly.

#Debugging Nock uses debug, so just run with enviromental variable DEBUG set to nock.*

PROTIP

If you don't want to match the request body you can use this trick (by @theycallmeswift):

var scope = nock('http://api.myservice.com')
  .filteringRequestBody(function(body) {
    return '*';
  })
  .post('/some_uri', '*')
  .reply(200, 'OK');

License

(The MIT License)

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.

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Nock

Install

Use

READ THIS! (1) - About interceptors

READ THIS! (2) - About enableNetConnect

Specifying request body

Specifying replies

Access original request and headers

Replying with errors

Specifying headers

Header field names are case-insensitive

Specifying Request Headers

Specifying Reply Headers

Default Reply Headers

Including Content-Length Header Automatically

Including Date Header Automatically

HTTP Verbs

Support for HTTP and HTTPS

Non-standard ports

Repeat response n times

Delay the response

Delay the connection

Socket timeout

Chaining

Scope filtering

Path filtering

Request Body filtering

Request Headers Matching

Allow unmocked requests on a mocked hostname

Expectations

.isDone()

.cleanAll()

.persist()

.pendingMocks()

Logging

Restoring

Turning Nock Off (experimental!)

Enable/Disable real HTTP request

Recording

dont_print option

output_objects option

enable_reqheaders_recording option

logging option

use_separator option

.removeInterceptor()

Nock Back

Setup

Options

Usage

Options

Modes

How does it work?

PROTIP

License

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`dont_print` option

`output_objects` option

`enable_reqheaders_recording` option

`logging` option

`use_separator` option

Packages