http://developer.github.com/v3/issues/#list-issues-for-a-repository

github_issue.lua

local GithubIssue = {}
local http = require("socket.http")
function GithubIssue.get(owner, repo)
  local response, status_code, headers, status = http.request("github.com/repos/" .. owner .. "/" .. repo .. "/issues")
  return response
end

github_issue_spec.lua

describe("GithubIssue", function()
  it("get function returns json", function()
    local old_get = Github.get
    Github.get = function()
      return "..." -- from this: http://developer.github.com/v3/issues/#list-issues-for-a-repository
    end
    assert.is.truthy(GithubIssue.get(1, 2))
  end)
end)