FakeNGX

FakeNGX is an initial attempt to create a library for testing Lua scripts embedded into Nginx, via HttpLuaModule

Features

Support for basic constants: ngx.HTTP_OK, etc
Support for core functions: ngx.time(...), ngx.encode_args(...), etc
Sub-request stubbing, e.g. ngx.location.capture()
Fully tested with Telescope

Supported functions (currently)

ngx.print()
ngx.say()
ngx.log()
ngx.time()
ngx.now()
ngx.exit()
ngx.escape_uri()
ngx.unescape_uri()
ngx.encode_args()
ngx.crc32_short()
ngx.location.capture()

Usage Example

This is an example for how to test your scripts with FakeNGX. Imagine this is your Nginx configuration:

-- nginx.conf
location /internal {
  internal;
  content_by_lua 'ngx.print("OK")';
}

location /main {
  content_by_lua_file 'main.lua';
}

It's good practice to keep file loaded by content_by_lua_file at a minimum and place all processing logic into external modules. This allows lua_code_cache to work its magic and simplifies your testing. For example:

-- main.lua
local my_module = require 'my_module'
my_module.run()

Then, place all the controller code into separate module(s):

-- my_module.lua
module("my_module", package.seeall)

local function respond()
  local res = ngx.location.capture("/internal", { method = ngx.HTTP_POST })

  if res.status == ngx.HTTP_OK then
    ngx.print(res.body)
  else
    ngx.print("ERR")
    ngx.exit(500)
  end
end

function run()
  if ngx.var.http_authentication == "TOKEN"
    respond()
  else
    ngx.exit(403)
  end
end

return my_module

In your tests e.g. with Telescope:

fakengx   = require 'fakengx'
my_module = require 'my_module'

context('my_module', function()

  before(function()
    ngx = fakengx.new() -- create a fresh ngx on each request context
  end)

  test('run unauthenticated', function()
    my_module.run()
    assert_equal(ngx._body, '')   -- No output
    assert_equal(ngx._exit, 403)  -- Exited with 403
    assert_equal(ngx.status, 403) -- Response status
  end)

  test('run success', function()
    ngx.location.stub('/internal', {}, { body = "OK" })
    ngx.var['http_authentication' = "TOKEN"
    my_module.run()
    assert_equal(ngx._body, 'OK') -- Written "OK"
    assert_nil(ngx._exit)         -- No explicit exit
    assert_equal(ngx.status, 200) -- Response status
  end)

  test('run failure', function()
    ngx.location.stub('/internal', {}, { status = 302 })
    my_module.run()
    assert_equal(ngx._body, 'ERR')
    assert_equal(ngx._exit, 500)
    assert_equal(ngx.status, 500)
  end)

end)

Prerequsites

FakeNGX relies on the luasocket and the bitop libraries.

To install (on Debian, Ubuntu, etc):

sudo apt-get install lua5.1 luarocks liblua5.1-socket2 liblua5.1-bitop0 liblua5.1-md5-0

Contributing

You need to install telescope, via LuaRocks:

sudo luarocks install telescope

And run:

tsc -f spec/*_spec.lua

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.

DorianGray / fakengx