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Feature: let and let!
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. You can use `let!` to force the method's
invocation before each example.
Scenario: use let to define memoized helper method
Given a file named "let_spec.rb" with:
"""
$count = 0
describe "let" do
let(:count) { $count += 1 }
it "memoizes the value" do
count.should eq(1)
count.should eq(1)
end
it "is not cached across examples" do
count.should eq(2)
end
end
"""
When I run `rspec let_spec.rb`
Then the examples should all pass
Scenario: use let! to define a memoized helper method that is called in a before hook
Given a file named "let_bang_spec.rb" with:
"""
$count = 0
describe "let!" do
invocation_order = []
let!(:count) do
invocation_order << :let!
$count += 1
end
it "calls the helper method in a before hook" do
invocation_order << :example
invocation_order.should == [:let!, :example]
count.should eq(1)
end
end
"""
When I run `rspec let_bang_spec.rb`
Then the examples should all pass
Version data entries
150 entries across 95 versions & 14 rubygems