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https://github.com/for-GET/katt

KATT (Klarna API Testing Tool) is an HTTP-based API testing tool for Erlang.
https://github.com/for-GET/katt

api erlang har http test

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KATT (Klarna API Testing Tool) is an HTTP-based API testing tool for Erlang.

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# KATT [![Build Status][2]][1] [Docs][3]



KATT (Klarna API Testing Tool) is an HTTP-based API testing tool for Erlang,

, though it can work just as well as a CLI tool.



Use for shooting HTTP requests in a sequential order and verifying the response.

Any relevant difference between expected and actual responses will cause a

failure.



Install from git or https://hex.pm/packages/katt .



For convenience, [available as a Docker image too](https://hub.docker.com/r/ysoftwareab/katt): `docker run --rm -it -v $PWD:$PWD -w $PWD ysoftwareab/katt ...`.



And [whalebrew package](https://github.com/whalebrew/whalebrew): `brew install whalebrew && sudo whalebrew install ysoftwareab/katt; katt ...`



## Quick start on KATT and APIB files



### Example



[An example is worth a 1000 words. Have a look!](doc/example-httpbin.apib)



### Params



If some values are static (constants) and you want to reuse them across multiple requests,

you can add one or more params like below



```

PARAM a_string="with some text"

PARAM a_boolean=true

PARAM a_null=null

PARAM a_float=1.1

PARAM an_integer=1

```



### Validator



The builtin validator supports



* basic text validation

* more advanced validation of HTTP headers

* JSON validation `application/json`, `application/*+json`

* URL-encoded validation `application/x-www-form-urlencoded`



### Tags



The validator makes use of a few tags with special meaning:



`"{{_}}"`

Match anything including undefined (i.e. no real validation).



`"{{expected}}"`

Match anything but undefined (i.e. no real validation, only check existence).



`"{{unexpected}}"`

Match nothing (i.e. no real validation, only check lack of existence)



`"{{>key}}"`

Store value of the whole string (key must be unique within testcase)



`"{{ {pass, []}; false -> {not_equal, {ParentKey, Expected, Actual}} end"

  }

}

```



or in array format



```

{

  "rfc1123": {

    "{{type}}": "runtime_validation",

    "erlang": ["Expected = httpd_util:rfc1123_date(calendar:now_to_datetime(erlang:now())),",

               "case Actual =:= Expected of",

               "  true ->",

               "    {pass, []};",

               "  false ->",

               "    {not_equal, {ParentKey, Expected, Actual}}",

               "end"

              ]

  }

}

```



---



## Command-Line Interface



You can either build the `bin/katt` executable yourself (just type `make`),

or you can use a Docker image a call it with `docker run ysoftwareab/katt`.



You can fire up `katt` from the CLI, with

```bash

bin/katt base_url=http://httpbin.org my_name=Joe your_name=Mike -- doc/example-httpbin.apib

```



If you want non-string params, use `:=` as a separator e.g. `my_int:=123`.



You can also output the result in JSON format, with `--json`, and beautify it e.g. with python

```bash

bin/katt --json base_url=http://httpbin.org my_name=Joe your_name=Mike -- doc/example-httpbin.apib | python -m json.tool

```



Check `bin/katt --help` for a full list of arguments.



---



## Erlang Interface



A simple example that will make requests to a third party server:



```bash

ERL_LIBS=_build/default/deps erl $(for f in _build/default/lib/*/ebin; do echo "-pa $f"; done) -noshell -eval '

  application:ensure_all_started(katt),

  BlueprintFile = "doc/example-httpbin.apib",

  Params = [{base_url, "http://httpbin.org"}, {my_name, "Joe"}, {your_name, "Mike"}],

  io:format("~p~n", [katt:run(BlueprintFile, Params)]).

' -s init stop

```

... or run the code passed to -eval from the Erlang shell, assuming that you

have started the Erlang shell from the repo's root directory with

`ERL_LIBS=_build/default/deps erl $(for f in _build/default/lib/*/ebin; do echo "-pa $f"; done)` .



`katt:run` is to be called with



* `filename`

* `params` (optional)

  * `base_url`, alternatively you can use the legacy

    * `protocol`

    * `hostname`

    * `port`

    * `base_path`

  * `request_timeout`

  * `scenario_timeout`

* `callbacks` (optional)

  * `ext` to be called with `scope` (recall_body, parse, validate_body, validate_type)

  * `recall` to be called with `syntax`, `text`, `params`, `callbacks`

  * `parse` to be called with `headers`, `body`, `params`, `callbacks`

  * `request` to be called with `request`, `params`, `callbacks`

  * `validate` to be called with `expected`, `actual`, `params`, `callbacks`

  * `progress` to be called with `transaction_result`

  * `text_diff` to be called with `text`, `text`

  * `transform` to be called with `id`, `katt_request` or `{katt_response, actual_response}`, `params`, `callbacks`



---



## If you would like to convert a HAR file to an APIB file



The HTTP Archive format or HAR, is a JSON-formatted archive file format

for logging of a web browser's interaction with a site, [standardized by

the Web Performance Working Group of the World Wide Web Consortium (W3C)](https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/HAR/Overview.html).



For example, to convert [doc/example-teapot.har](doc/example-teapot.har)

into [doc/example-teapot.apib](doc/example-teapot.apib), run:



``` bash

bin/katt from-har --apib -- doc/example-teapot.har > doc/example-teapot.apib

```



## If you would like to disable JSON support



```erlang

OnlyText = fun(_Scope) -> [] end,

katt:run("text_only_scenario.apib", [], [{ext, OnlyText}]).

```



## If you would like to add XML support



```erlang

PlusXml =

  fun(recall_body) ->

    [ fun custom_callbacks_xml:recall_body/4

    ] ++ katt_callbacks:ext(recall_body);

  fun(parse) ->

    [ fun custom_callbacks_xml:parse/5

    ] ++ katt_callbacks:ext(parse);

  fun(validate_body) ->

    [ fun custom_callbacks_xml:validate_body/3

    ] ++ katt_callbacks:ext(validate_body),

  fun(validate_type) ->

    [ fun custom_callbacks_xml:validate_type/7

    ] ++ katt_callbacks:ext(validate_type),

katt:run("xml_scenario.apib", [], [{ext, PlusXml}]).

```



See [src/katt_callbacks_json.erl](src/katt_callbacks_json.erl) to see how your

`custom_callbacks_xml` module should be implemented.



## If you would like to build KATT with almost no dependencies



``` bash

export KATT_BARE_MODE=true

# or

touch _build/BARE_MODE

```



---



## Contributing



A pull-request is most welcome. Please make sure that the following criteria are

fulfilled before making your pull-request:



* Include a description regarding what has been changed and why.

* Make sure that the changed or added functionality (if you modify code) is

  covered by unit tests.

* Make sure that all unit tests pass.



## License



[Apache 2.0](LICENSE)



\* Despite the "Klarna" mention, this repository is not affiliated with Klarna AB.

KATT was indeed born at Klarna, and Klarna AB holds copyright for parts of the code,

but it is now being maintained outside the company, by its original authors and new contributors.



## Stargazers over time



[![Stargazers over time](https://starchart.cc/for-GET/katt.svg)](https://starchart.cc/for-GET/katt)



  [1]: https://github.com/for-GET/katt/actions?query=workflow%3ACI+branch%3Amaster

  [2]: https://github.com/for-GET/katt/workflows/CI/badge.svg?branch=master

  [3]: https://dev.erldocs.com/github.com/for-get/katt/