rspec my best practice
DESCRIPTION
RSpec My Best PracticeTRANSCRIPT
MyBest
PracticeRSp
ec
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make
use ofGOOD LET
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examples
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examples
describe User do describe '#admin?' do subject { user.admin? }
context "when user is administrator" do let(:user) do FactoryGirl.create :user, admin: true end
it "returns true" do expect(subject).to be_true end end
context "when user is not administrator" do let(:user) do FactoryGirl.create :user, admin: false end
it "returns false" do expect(subject).to be_false end end end
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examples
describe User do describe '#admin?' do subject { user.admin? }
context "when user is administrator" do let(:user) do FactoryGirl.create :user, admin: true end
it "returns true" do expect(subject).to be_true end end
context "when user is not administrator" do let(:user) do FactoryGirl.create :user, admin: false end
it "returns false" do expect(subject).to be_false end end end
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examples
describe User do describe '#admin?' do subject { user.admin? }
context "when user is administrator" do let(:user) do FactoryGirl.create :user, admin: true end
it "returns true" do expect(subject).to be_true end end
context "when user is not administrator" do let(:user) do FactoryGirl.create :user, admin: false end
it "returns false" do expect(subject).to be_false end end end
NOT DRY13年2月3日日曜日
UsingDefining
forLET
Context★★
★
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examples
describe User do describe '#admin?' do subject { user.admin? }
context "when user is administrator" do let(:user) do FactoryGirl.create :user, admin: true end
it "returns true" do expect(subject).to be_true end end
context "when user is not administrator" do let(:user) do FactoryGirl.create :user, admin: false end
it "returns false" do expect(subject).to be_false end end end
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examples
describe User do describe '#admin?' do subject { user.admin? }
let(:user) { FactoryGirl.create :user, admin: admin }
context "when user is administrator" do let(:admin) { true }
it "returns true" do expect(subject).to be_true end end
context "when user is not administrator" do let(:admin) { false }
it "returns false" do expect(subject).to be_false end end endend
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examples
describe User do describe '#admin?' do subject { user.admin? }
let(:user) { FactoryGirl.create :user, admin: admin }
context "when user is administrator" do let(:admin) { true }
it "returns true" do expect(subject).to be_true end end
context "when user is not administrator" do let(:admin) { false }
it "returns false" do expect(subject).to be_false end end endend
context "when user is administrator" do let(:admin) { true }
it "returns true" do expect(subject).to be_true end end
Write ONLY changing parameters under ‘context’.By doing so, the spec is very clear and meaningful.
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examples
describe User do describe '#admin?' do subject { user.admin? }
let(:user) { FactoryGirl.create :user, admin: admin }
context "when user is administrator" do let(:admin) { true }
it "returns true" do expect(subject).to be_true end end
context "when user is not administrator" do let(:admin) { false }
it "returns false" do expect(subject).to be_false end end endend
HOW TO
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examples
describe User do describe '#admin?' do subject { user.admin? }
let(:user) { FactoryGirl.create :user, admin: admin }
context "when user is administrator" do let(:admin) { true }
it "returns true" do expect(subject).to be_true end end
context "when user is not administrator" do let(:admin) { false }
it "returns false" do expect(subject).to be_false end end endend
let(:user) { FactoryGirl.create :user, admin: admin }
★ Prepare resources using ‘let’, ‘let!’
and ‘before’ under describe.13年2月3日日曜日
examples
describe User do describe '#admin?' do subject { user.admin? }
let(:user) { FactoryGirl.create :user, admin: admin }
context "when user is administrator" do let(:admin) { true }
it "returns true" do expect(subject).to be_true end end
context "when user is not administrator" do let(:admin) { false }
it "returns false" do expect(subject).to be_false end end endend
let(:user) { FactoryGirl.create :user, admin: admin }
★ Parameters changes in context is defined by ‘let’
under context, and use ONLY let at there.
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examples
describe User do describe '#admin?' do subject { user.admin? }
let(:user) { FactoryGirl.create :user, admin: admin }
context "when user is administrator" do let(:admin) { true }
it "returns true" do expect(subject).to be_true end end
context "when user is not administrator" do let(:admin) { false }
it "returns false" do expect(subject).to be_false end end endend
context "when user is administrator" do let(:admin) { true }
★ Parameters changes in ‘context’ is defined by
‘let’ under context, and use ONLY ‘let’ at there.
context "when user is not administrator" do let(:admin) { false }
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examples
describe User do describe '#admin?' do subject { user.admin? }
let(:user) { FactoryGirl.create :user, admin: admin }
context "when user is administrator" do let(:admin) { true }
it "returns true" do expect(subject).to be_true end end
context "when user is not administrator" do let(:admin) { false }
it "returns false" do expect(subject).to be_false end end endend
MECHANISM
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MECHANISMLazyEvaluation
http://www.fanpop.com/clubs/ho-kago-tea-time/images/29622703/title/dont-lazy-wallpaper13年2月3日日曜日
examples
describe User do describe '#admin?' do subject { user.admin? }
let(:user) { FactoryGirl.create :user, admin: admin }
context "when user is administrator" do let(:admin) { true }
it "returns true" do expect(subject).to be_true end end
context "when user is not administrator" do let(:admin) { false }
it "returns false" do expect(subject).to be_false end end endend
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examples
subject { user.admin? }
let(:user) do FactoryGirl.create :user, admin: adminend
context "when user is administrator" do let(:admin) { true }
it "returns true" do expect(subject).to be_true endend
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examples
subject { user.admin? }
let(:user) do FactoryGirl.create :user, admin: adminend
context "when user is administrator" do let(:admin) { true }
it "returns true" do expect(subject).to be_true endend
★ At first, RSpec evaluates this line.
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examples
subject { user.admin? }
let(:user) do FactoryGirl.create :user, admin: adminend
context "when user is administrator" do let(:admin) { true }
it "returns true" do expect(subject).to be_true endend
★ Then ‘subject’ is evaluated.
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examples
subject { user.admin? }
let(:user) do FactoryGirl.create :user, admin: adminend
context "when user is administrator" do let(:admin) { true }
it "returns true" do expect(subject).to be_true endend
★ And ‘user’ defined by ‘let’
is evaluated.13年2月3日日曜日
examples
subject { user.admin? }
let(:user) do FactoryGirl.create :user, admin: adminend
context "when user is administrator" do let(:admin) { true }
it "returns true" do expect(subject).to be_true endend
★ And ‘admin’ defined by ‘let’
is evaluated.13年2月3日日曜日
examples
subject { user.admin? }
let(:user) do FactoryGirl.create :user, admin: adminend
context "when user is administrator" do let(:admin) { true }
it "returns true" do expect(subject).to be_true endend
FactoryGirl.create(:user, admin: true).admin?
★ Finally, ‘subject’ is evaluated to
this.13年2月3日日曜日
examples
describe User do describe '#admin?' do subject { user.admin? }
let(:user) { FactoryGirl.create :user, admin: admin }
context "when user is administrator" do let(:admin) { true }
it "returns true" do expect(subject).to be_true end end
context "when user is not administrator" do let(:admin) { false }
it "returns false" do expect(subject).to be_false end end endend
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Clear Spec
Yes!!We Got
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Lazy EvaluationUsing
Readers...onBurden
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IT’STRADE-OFF
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To makeDRY SPECuse a fewLazy Evaluation
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Ifthere is manyLazy Evaluation,
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IT’S TIME TO
REFACTORING
and it’s a very very fun time :p
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blogged athttp://blog.tanaka51.jp/blog/2012/12/14/rspec-best-practice/
referenced byhttps://speakerdeck.com/holman
http://kotas.hatenablog.jp/entry/2012/11/22/000046
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