Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Testing Asynchronous OTP
Search
Andrea Leopardi
September 09, 2021
Programming
1
530
Testing Asynchronous OTP
Andrea Leopardi
September 09, 2021
Tweet
Share
More Decks by Andrea Leopardi
See All by Andrea Leopardi
The Umbrella and the Range
whatyouhide
0
17
gen_statem - OTP's Unsung Hero
whatyouhide
2
270
The World is a Network (and We Are Just Nodes)
whatyouhide
1
230
BEAM: The Perfect Fit for Networks
whatyouhide
1
210
Update from the Elixir team - 2022
whatyouhide
0
420
Elixir Sightseeing Tour
whatyouhide
0
440
Mint - Disrupting HTTP clients
whatyouhide
0
260
BEAM Architecture Handbook
whatyouhide
7
2.9k
The Evolution of a Language
whatyouhide
0
170
Other Decks in Programming
See All in Programming
iOSでSVG画像を扱う
kishikawakatsumi
0
130
Developer Joy - The New Paradigm
hollycummins
1
250
iOSエンジニア向けの英語学習アプリを作る!
yukawashouhei
0
200
CSC509 Lecture 06
javiergs
PRO
0
260
Leading Effective Engineering Teams in the AI Era
addyosmani
7
510
Six and a half ridiculous things to do with Quarkus
hollycummins
0
190
What's new in Spring Modulith?
olivergierke
1
160
いま中途半端なSwift 6対応をするより、Default ActorやApproachable Concurrencyを有効にしてからでいいんじゃない?
yimajo
2
440
あなたとKaigi on Rails / Kaigi on Rails + You
shimoju
0
170
品質ワークショップをやってみた
nealle
0
570
Introduce Hono CLI
yusukebe
6
2.9k
Pull-Requestの内容を1クリックで動作確認可能にするワークフロー
natmark
2
520
Featured
See All Featured
A Tale of Four Properties
chriscoyier
161
23k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
508
140k
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
32
1.6k
The World Runs on Bad Software
bkeepers
PRO
72
11k
Practical Orchestrator
shlominoach
190
11k
Code Review Best Practice
trishagee
72
19k
Optimising Largest Contentful Paint
csswizardry
37
3.5k
Fireside Chat
paigeccino
40
3.7k
10 Git Anti Patterns You Should be Aware of
lemiorhan
PRO
657
61k
Intergalactic Javascript Robots from Outer Space
tanoku
273
27k
Building a Modern Day E-commerce SEO Strategy
aleyda
44
7.8k
The Cult of Friendly URLs
andyhume
79
6.6k
Transcript
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
defmodule RollingAverage do use GenServer def start_link(limit), do: # ...
def add(pid, n), do: # ... def average(pid), do: # ... end
None
None
test "add/2" do {:ok, pid} = RollingAverage.start_link() RollingAverage.add(pid, 3) #
Now what? end
None
test "add/2 and average/1" do {:ok, pid} = RollingAverage.start_link(2) RollingAverage.add(pid,
3) RollingAverage.add(pid, 4) assert RollingAverage.average(pid) == 3.5 RollingAverage.add(pid, 5) assert RollingAverage.average(pid) == 4.5 end
None
defmodule RollingList do def new(limit), do: {limit, []} def add({limit,
list}, n), do: # ... def average({_limit, list}), do: # ... end
test "add/2" do rolling_list = RollingList.new(2) assert RollingList.add(rolling_list, 3) ==
{_limit = 2, [3]} end
None
test "add/2" do {:ok, pid} = RollingAverage.start_link(2) RollingAverage.add(pid, 3) state
= :sys.get_state(pid) assert state == {_limit = 2, [3]} end
None
None
test "add/2 and average/1" do {:ok, pid} = start_supervised( {RollingAverage,
_limit = 2} ) # Same as before end
None
def background_work do Task.start(fn -> do_something() end) end
None
None
def background_work(parent, ref) do Task.start(fn -> do_something() send(parent, {ref, :done})
end) end
test "background_work/0" do ref = make_ref() background_work(self(), ref) assert_receive {^ref,
:done} end
None
def background_work do Task.start(fn -> :ok = twitter_module.post() end) end
test "background_work/0" do parent = self() ref = make_ref() Mox.expect(TwitterMock,
:post, fn -> send(parent, ref) :ok end) background_work() assert_receive ^ref end
None
defmodule WeatherChecker do use GenServer def init(_) do :timer.send_interval(5000, self(),
:tick) end def handle_info(:tick, _) do check_weather() end end
test "checking weather periodically" do {:ok, _pid} = WeatherChecker.start_link() Process.sleep(5000
* 1.5) assert weather_checked?() end
None
defmodule WeatherChecker do use GenServer def init(_) do :timer.send_interval(5000, self(),
:tick) end def tick(pid), do: send(pid, :tick) def handle_info(:tick, _) do check_weather() end end
test "checking weather periodically" do {:ok, pid} = WeatherChecker.start_link() WeatherChecker.tick(pid)
assert weather_checked?() end
defmodule WeatherChecker do use GenServer def init(:interval) do :timer.send_interval(5000, self(),
:tick) end def init(:manual) do # No send_interval end end
None
@mix_env Mix.env() def start(_type, _args) do Supervisor.start_link(children(@mix_env), ...) end defp
children(:test), do: [...] defp children(_env), do: [WeatherChecker | ...]
None
None
None
None
test "cleanup after crashes" do Process.flag(:trap_exit, true) {:ok, pid} =
start_supervised(MyServer) Process.exit(pid, :kill) assert cleanup_successful?() end
None
None
None
None
None
None
None
None
None
None