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More about adding a collaboratorlet 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.
- Scenarios
-
- Use `let` to define memoized helper method
-
- Given
-
a file named "let_spec.rb" with:
$count = 0 RSpec.describe "let" do let(:count) { $count += 1 } it "memoizes the value" do expect(count).to eq(1) expect(count).to eq(1) end it "is not cached across examples" do expect(count).to eq(2) end end
- When
-
I run
rspec let_spec.rb
- Then
- the examples should all pass
- 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 RSpec.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 expect(invocation_order).to eq([:let!, :example]) expect(count).to eq(1) end end
- When
-
I run
rspec let_bang_spec.rb
- Then
- the examples should all pass
Last published over 7 years ago by myronmarston.