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
0
490
Testing Asynchronous OTP
Andrea Leopardi
September 09, 2021
Tweet
Share
More Decks by Andrea Leopardi
See All by Andrea Leopardi
The World is a Network (and We Are Just Nodes)
whatyouhide
0
190
BEAM: The Perfect Fit for Networks
whatyouhide
1
170
Update from the Elixir team - 2022
whatyouhide
0
380
Elixir Sightseeing Tour
whatyouhide
0
400
Mint - Disrupting HTTP clients
whatyouhide
0
230
BEAM Architecture Handbook
whatyouhide
7
2.7k
The Evolution of a Language
whatyouhide
0
130
Elixir - functional, concurrent, distributed programming for the rest of us
whatyouhide
2
310
Papers we love: Elixir edition
whatyouhide
5
1.1k
Other Decks in Programming
See All in Programming
Django NinjaによるAPI開発の効率化とリプレースの実践
kashewnuts
1
250
How mixi2 Uses TiDB for SNS Scalability and Performance
kanmo
40
16k
ソフトウェアエンジニアの成長
masuda220
PRO
12
2.1k
From the Wild into the Clouds - Laravel Meetup Talk
neverything
0
140
お前もAI鬼にならないか?👹Bolt & Cursor & Supabase & Vercelで人間をやめるぞ、ジョジョー!👺
taishiyade
7
4.2k
コミュニティ駆動 AWS CDK ライブラリ「Open Constructs Library」 / community-cdk-library
gotok365
2
240
たのしいSocketのしくみ / Socket Under a Microscope
coe401_
8
1.3k
Boos Performance and Developer Productivity with Jakarta EE 11
ivargrimstad
0
290
pylint custom ruleで始めるレビュー自動化
shogoujiie
0
150
Datadog Workflow Automation で圧倒的価値提供
showwin
1
160
Serverless Rust: Your Low-Risk Entry Point to Rust in Production (and the benefits are huge)
lmammino
1
150
Datadog DBMでなにができる? JDDUG Meetup#7
nealle
0
140
Featured
See All Featured
Being A Developer After 40
akosma
89
590k
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
tammyeverts
49
2.3k
GraphQLの誤解/rethinking-graphql
sonatard
68
10k
Building a Scalable Design System with Sketch
lauravandoore
461
33k
Mobile First: as difficult as doing things right
swwweet
223
9.4k
The Cost Of JavaScript in 2023
addyosmani
47
7.4k
A Philosophy of Restraint
colly
203
16k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
666
120k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
356
29k
Java REST API Framework Comparison - PWX 2021
mraible
29
8.4k
A Modern Web Designer's Workflow
chriscoyier
693
190k
JavaScript: Past, Present, and Future - NDC Porto 2020
reverentgeek
47
5.2k
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