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An RSpec 3 Talk
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Penelope Phippen
December 08, 2014
Technology
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An RSpec 3 Talk
A talk about RSpec 3 that I gave at LRUG December 2014.
Penelope Phippen
December 08, 2014
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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 sam@funandplausible.com
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 sam@funandplausible.com
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 sam@funandplausible.com