Fixture Replacement
==
Skeleton of Dummy
Data for Tests
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Fixture == Data itself
Fixture Replacement
== Skeleton of Data
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# factories/users.rb
Factory.define(:album) do |a|
a.title "Album Title"
a.password "Album Password"
end
album = Factory.create(:album)
album = Factory.create(:album,
:title => "Happy Wedding")
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# factories/users.rb
Factory.define(:alice) do |u|
u.email "alice@example.com"
end
Factory.define(:bob) do |u|
u.email "bob@example.com"
end
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# factories/users.rb
Factory.sequence(:email) do |n|
"user_#{n}@example.com"
end
Factory.define(:user) do |u|
u.email { Factory.next(:email) }
end
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Flexible
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# factories/pages.rb
Factory.define(:twitter) do |p|
p.url "http://twitter.com/"
end
Factory.define(:facebook) do |p|
p.url "http://facebook.com/"
end
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# factories/users.rb
Factory.define(:alice) do |u|
u.pages {[ Factory(:twitter) ]}
end
Factory.define(:bob) do |u|
u.pages {[ Factory(:facebook) ]}
end
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bob = Factory.create(:bob)
assert bob.pages.first.url ==
"http://facebook.com/"
# SUCCESS
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But...
Flexible
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Fixture
Replacement is
Not a Silver
Bullet
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Children w/
Independent
Parent
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# factories/albums.rb
Factory.define(:album) do |a|
a.user { Factory(:user) }
end
Factory.define(:paid) do |a|
a.user { Factory(:user) }
end
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3.times do
album = Factory.create(:album)
end
paid = Factory.create(:paid)
user = paid.user
assert user.albums.count == 4
# FAIL
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user = Factory.create(:user)
3.times do
Factory(:album, :user => user)
end
Factory(:paid, :user => user)
assert user.albums.count == 4
# SUCCESS
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Not DRY
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Proposal:
Fixture w/ Fixture
Replacement
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Test Context Arrangement Recipebook
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First, Use Fixture.
Complex, Then Use
Fixture Replacement.