command module
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Published: Feb 9, 2016 License: GPL-2.0 Imports: 7 Imported by: 0


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Markdown based document-driven web API testing.

PROJECT STATUS: Looking for BETA testers.

Example Silk test file

Markdown API

Tests are made up of documents written in Markdown.

  • # Group - Top level headings represent groups of requests
  • ## GET /path - Second level headings represent a request
  • Code blocks with three back tics represent bodies
  • * Field: value - Lists describe headers and assertions
  • * ?param=value - Request parameters
  • === seperators break requests from responses
  • Comments (starting with //) are ignored
  • Plain text is ignored to allow you to add documentation
  • Inline back tics are ignored and are available for formatting
Document structure

A document is made up of:

  • A request
  • === seperator
  • Assertions

A request starts with ## and must have an HTTP method, and a path:

## METHOD /path

Examples include:

## GET /people

## POST /people/1/comments

## DELETE /people/1/comments/2

Request body (optional)

To specify a request body (for example for POST requests) use a codeblock using backtics (```):

{"name": "Silk", "release_year": 2016}
Request headers (optional)

You may specify request headers using lists (prefixed with *):

* Content-Type: "application/json"
* X-Custom-Header: "123"
Request parameters (optional)

Adding parameters to the path (like GET /path?q=something) can be tricky, especially when you consider escaping etc. To address this, Silk supports parameters like lists:

* ?param=value

The parameters will be correctly added to the URL path before the request is made.


Following the === separator, you can specify assertions about the response. At a minimum, it is recommended that you assert the status code to ensure the request succeeded:

  * Status: 200

You may also specify response headers in the same format as request headers:

  * Content-Type: "application/json"
  * X-MyServer-Version: "v1.0"

If any of the headers do not match, the test will fail.

Validating data

You can optionally include a verbatim body using ``` code blocks. If the response body does not exactly match, the test will fail:

{"id": 1, "name": "Silk", "release_year": 2016}

Alternatively, you can specify a list (using *) of data fields to assert accessible via the Data object:

  * Status: 201
  * Content-Type: "application/json"
  * "Silk"
  * Data.release_year: 2016
  * Data.tags[0]: "testing"
  * Data.tags[1]: "markdown"
  • NOTE: Currenly this feature is only supported for JSON APIs.

Values may be regex, if they begin and end with a forward slash: /. The assertion will pass if the value (after being turned into a string) matches the regex.

  * Status: /^2.{2}$/
  * Content-Type: /application/json/

The above will assert that:

  • The status beings with 2, and
  • The Content-Type contains application/json

Command line

The silk command runs tests against an HTTP endpoint.


silk -url="{endpoint}" {testfiles}
  • {url} the endpoint URL (e.g. http://localhost:8080)
  • {testfiles} path to test files (e.g. ./testfiles)


  • Omit trailing slash from url
  • {testfiles} can include a pattern (e.g. /path/*


Silk is written in Go and integrates seamlessly into existing testing tools and frameworks. Import the runner package and use RunGlob to match many test files:

package project_test

import (

func TestAPIEndpoint(t *testing.T) {
  // start a server
  s := httptest.NewServer(yourHandler)
  defer s.Close()
  // run all test files
  runner.New(t, s.URL).RunGlob(filepath.Glob("../testfiles/failure/*"))


The Go Gopher

There is no documentation for this package.

Source Files


Path Synopsis
Package parse provides low-level tools for parsing Silk files.
Package parse provides low-level tools for parsing Silk files.
Package runner provides tools for running Silk tests.
Package runner provides tools for running Silk tests.
Package testutil contains tools useful for testing.
Package testutil contains tools useful for testing.

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