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|
--- Assertions, the test registry and control of the fake server.
--
-- No rock beyond the ones the library already needs: registering a test is
-- `test(name, fn)`, a failure is an `error()` out of an assertion, and the
-- runner exits non-zero if any of them fires.
local http = require("socket.http")
local ltn12 = require("ltn12")
local socket = require("socket")
local json = require("dkjson")
local M = {}
M.tests = {}
--- Register a test. Order of registration is order of execution.
function M.test(name, fn)
M.tests[#M.tests + 1] = { name = name, fn = fn }
end
local function fail(message, level)
error(message, (level or 2) + 1)
end
local function show(value)
if type(value) == "string" then
return string.format("%q", value)
end
return tostring(value)
end
function M.ok(value, message)
if not value then
fail(message or ("expected a truthy value, got " .. show(value)))
end
end
function M.falsy(value, message)
if value then
fail(message or ("expected a falsy value, got " .. show(value)))
end
end
function M.equal(got, want, message)
if got ~= want then
fail(
(message and (message .. ": ") or "")
.. "expected "
.. show(want)
.. ", got "
.. show(got)
)
end
end
function M.near(got, want, message)
if type(got) ~= "number" or math.abs(got - want) > 1e-6 then
fail((message and (message .. ": ") or "") .. "expected ~" .. tostring(want) .. ", got " .. show(got))
end
end
function M.is_nil(value, message)
if value ~= nil then
fail(message or ("expected nil, got " .. show(value)))
end
end
function M.is_false(value, message)
if value ~= false then
fail(message or ("expected false, got " .. show(value)))
end
end
--- Assert a call failed with a given error kind, and return the error.
function M.error_kind(value, err, kind)
if value ~= nil then
fail("expected a failure, got " .. show(value))
end
if type(err) ~= "table" or err.kind == nil then
fail("expected a cepis error, got " .. show(err))
end
if err.kind ~= kind then
fail("expected kind " .. show(kind) .. ", got " .. show(err.kind) .. " (" .. tostring(err.message) .. ")")
end
return err
end
--- Assert a call raised through `error()`, for programmer mistakes.
function M.raises(fn, ...)
local ok = pcall(fn, ...)
if ok then
fail("expected error() to be raised")
end
end
local function request(url, body)
local chunks = {}
local headers = nil
local source = nil
if body then
source = ltn12.source.string(body)
headers = {
["content-length"] = tostring(#body),
["content-type"] = "application/json",
}
end
local ok, code = http.request({
url = url,
method = body and "POST" or "GET",
source = source,
headers = headers,
sink = ltn12.sink.table(chunks),
})
if not ok then
error("control request to " .. url .. " failed: " .. tostring(code))
end
return table.concat(chunks)
end
local Server = {}
Server.__index = Server
--- Replace the routes and clear the call log.
function Server:program(routes)
request(self.url .. "/__program", json.encode(routes))
end
--- Every request target the server has seen since the last `program`.
function Server:calls()
return json.decode(request(self.url .. "/__calls")) or {}
end
--- How many of them began with `prefix`.
function Server:count(prefix)
local total = 0
for _, target in ipairs(self:calls()) do
if target:sub(1, #prefix) == prefix then
total = total + 1
end
end
return total
end
function Server:stop()
pcall(request, self.url .. "/__stop")
end
--- Spawn the fake server and wait for it to report its port.
function M.start_server()
local directory = (arg[0] or "test/run.lua"):match("^(.*)[/\\]") or "."
local portfile = os.tmpname()
os.remove(portfile)
local interpreter = arg[-1] or "lua"
os.execute(
string.format(
"%s %s/server.lua %s >/dev/null 2>&1 &",
interpreter,
directory,
portfile
)
)
local port
local deadline = socket.gettime() + 10
while socket.gettime() < deadline do
local handle = io.open(portfile, "r")
if handle then
local content = handle:read("*a")
handle:close()
port = tonumber(content)
if port then
break
end
end
socket.sleep(0.02)
end
os.remove(portfile)
if not port then
error("the fake server did not start")
end
return setmetatable({ url = "http://127.0.0.1:" .. port, port = port }, Server)
end
--- Run every registered test, printing one line each.
function M.run()
local failures = 0
for _, entry in ipairs(M.tests) do
local ok, err = pcall(entry.fn)
if ok then
print("ok - " .. entry.name)
else
failures = failures + 1
print("FAIL - " .. entry.name)
print(" " .. tostring(err))
end
end
print(string.format("\n%d test(s), %d failure(s)", #M.tests, failures))
return failures
end
return M
|