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
An RSpec 3 Talk
Search
Penelope Phippen
December 08, 2014
Technology
0
140
An RSpec 3 Talk
A talk about RSpec 3 that I gave at LRUG December 2014.
Penelope Phippen
December 08, 2014
Tweet
Share
More Decks by Penelope Phippen
See All by Penelope Phippen
Introducing Rubyfmt
penelope_zone
0
560
How RSpec Works
penelope_zone
0
6.6k
Quick and easy browser testing using RSpec and Rails 5.1
penelope_zone
1
82
Teaching RSpec to play nice with Rails
penelope_zone
2
130
Little machines that eat strings
penelope_zone
1
99
What is processor (brighton ruby edition)
penelope_zone
0
110
What is processor?
penelope_zone
1
350
extremely defensive coding - rubyconf edition
penelope_zone
0
260
Agile, etc.
penelope_zone
2
220
Other Decks in Technology
See All in Technology
KiCadでPad on Viaの基板作ってみた
iotengineer22
0
280
OPENLOGI Company Profile
hr01
0
67k
AIとともに進化するエンジニアリング / Engineering-Evolving-with-AI_final.pdf
lycorptech_jp
PRO
0
150
事業成長の裏側:エンジニア組織と開発生産性の進化 / 20250703 Rinto Ikenoue
shift_evolve
PRO
2
18k
【5分でわかる】セーフィー エンジニア向け会社紹介
safie_recruit
0
26k
Flutter向けPDFビューア、pdfrxのpdfium WASM対応について
espresso3389
0
120
マネジメントって難しい、けどおもしろい / Management is tough, but fun! #em_findy
ar_tama
5
700
さくらのIaaS基盤のモニタリングとOpenTelemetry/OSC Hokkaido 2025
fujiwara3
2
310
ビズリーチが挑む メトリクスを活用した技術的負債の解消 / dev-productivity-con2025
visional_engineering_and_design
3
6.2k
「クラウドコスト絶対削減」を支える技術—FinOpsを超えた徹底的なクラウドコスト削減の実践論
delta_tech
4
130
自律的なスケーリング手法FASTにおけるVPoEとしてのアカウンタビリティ / dev-productivity-con-2025
yoshikiiida
1
14k
ビギナーであり続ける/beginning
ikuodanaka
3
700
Featured
See All Featured
Site-Speed That Sticks
csswizardry
10
680
How STYLIGHT went responsive
nonsquared
100
5.6k
Sharpening the Axe: The Primacy of Toolmaking
bcantrill
44
2.4k
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
tammyeverts
5
260
The Cult of Friendly URLs
andyhume
79
6.5k
BBQ
matthewcrist
89
9.7k
Designing for Performance
lara
610
69k
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
smashingmag
252
21k
Build The Right Thing And Hit Your Dates
maggiecrowley
36
2.8k
Documentation Writing (for coders)
carmenintech
72
4.9k
Balancing Empowerment & Direction
lara
1
410
Testing 201, or: Great Expectations
jmmastey
42
7.6k
Transcript
An RSpec 3 Talk
a!/samphippen
RSpec RSpec ! ! RSpec 3
Upgrading
The easiest major gem upgrade you’ve ever done
The upgrade process
Be green and warning free on RSpec 2
gem “rspec”, “~> 2.99”
bundle install
fix warnings
gem “rspec”, “~> 3.0”
Done.
There is also Transpec
None
Verifying doubles
Who’s ever stubbed an object’s interface wrong?
class Foo def bar(beers) “#{beers} bottles of beer” end end
allow(Foo.new).to receive(:bare)
None
class Foo def bar(beers) “#{beers} bottles of beer” end end
allow(Foo.new).to receive(:bar).with(1,2)
None
Not enabled by default for upgrade installs
RSpec.configure do |config| config.mock_with :rspec do |mocks| mocks.verify_partial_doubles = true
end end
http://tinyurl.com/p6yk8ll
Verifying behaviour on pure doubles
double( :some_name_for_the_double, :call => :result )
instance_double( MyClass, :call => :result )
instance_double( MyClass, :call => :result )
instance_double( “MyClass”, :call => :result )
Let’s have some questions !!/samphippen
[email protected]
Also class_double and object_double
Composable matchers
One Expectation Per Test
expect(json[“foo”]).to eq(bar) expect(json[“baz”]).to eq(quz) expect(json[“boz”][“buz”]).to match(id_regex)
expect(json[“foo”]).to eq(bar) expect(json[“baz”]).to eq(quz) expect(json[“boz”][“buz”]).to match(id_regex)
Could write separate tests
That could be expensive
expect(json).to match( “foo” => bar, “baz” => quz, “boz” =>
{ “buz” => match(id_regex) } )
Match parts of hashes and arrays
{ “key” => { “key1” => value1, “key2” => value2,
} }
expect(foo).to match( “key” => a_hash_including( “key2”=> value2 ) )
{ “key” => [1,2,3] }
expect(foo).to match( “key” => an_array_including(1) )
Compound expressions via and and or
expect(alphabet).to start_with("a") expect(alphabet).to end_with("z")
expect(alphabet) .to start_with(“a”) .and end_with("z")
expect(stoplight.color) .to eq(“red") .or eq(“green") .or eq("yellow")
Nearly all existing RSpec matchers are composable
Works with custom matchers
Rails
Let’s have some questions !!/samphippen
[email protected]
OMG. Loading rails is the worst thing ever
files took 2.09 seconds to load
spec_helper is now split
spec_helper.rb Loads RSpec, not your app
rails_helper.rb Loads RSpec + whole rails app
Spec Types
RSpec rails used to be highly implicit
#spec/controllers/foo_controller_spec.rb describe FooController it “magically has get and assigns methods????”
get :index expect(assigns[:foo]).to be true end end
#spec/controllers/foo_controller_spec.rb describe FooController, :type => :controller it “gets the methods
from the metadata” get :index expect(assigns[:foo]).to be true end end
This applies to all Rails spec types
You can structure your specs however you like
If you badly need directory based spec inference
RSpec.configure do |config| config.infer_spec_type_from_file_location! end
http://tinyurl.com/kgllgtb
RSpec is trying to get less bad at patching methods
on to everything for you
Sytnax
The “a.should == b” syntax is not gone
It is deprecated
I strongly advise you to use expect(a).to eq(b) everywhere
a.should == b expect(a).to eq(b)
a.should_receive(:foo) expect(a).to receive(:foo)
a.stub(:foo) allow(a).to receive(:foo)
expect { }.to raise_error ! #is the same
a.any_instance.stub(:foo) allow_any_instance_of(a).to receive(:foo)
a.any_instance.should_receive(:foo) expect_any_instance_of(a).to receive(:foo)
RSpec also now has a “no monkey patching” mode
RSpec 2 monkey patches #describe
describe “” do describe “” do end it “” do
end end
RSpec.describe “” do describe “” do end it “” do
end end
bare describe is still available in RSpec contexts
This one might trip you up
be_true be_false
be_truthy be_falsy be_falsey
be true be false
Let’s have some questions a!/samphippen
[email protected]