清理 rspec 中的 shared_context 变量

Question

I am using RSpec.shared_context to set variables that all the describe blocks will use.

Something like this

RSpec.shared_context "common" do 
  let(:name) { #creates a database object }
   #more let statements
end

Now I invoke it from describe block like so

describe "common test" do 
  include_context "common"
  #run few tests
end

Now after running the describe block I want to clean it up. How do I rollback all the objects created in the shared context?

I tried cleaning it in the after(:context) hook but since it is a let statement the variable name is only allowed inside examples.

Is there someway I can use use_transactional_fixtures to clean this up after running the tests in the describe block.

Answer 1

You don't need to worry about cleaning up your "lets" if you just setup your test suite properly to wipe the database.

Use let to define a memoized helper method. The value will be cached across multiple calls in the same example but not across examples.

Note that let is lazy-evaluated: it is not evaluated until the first time the method it defines is invoked.

In almost every case you want teardown to happen automatically and per example. Thats what config.transactional_fixtures does - it rolls back the database after every example so that you have a fresh slate and don't get test ordering issues. Relying on each example / context whatever to explicitly clean up after itself is just a recipe for failure.