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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.
- Scenarios
-
- 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 == 1 count.should == 1 end it "is not cached across examples" do count.should == 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 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 == 1 end end
- When
-
I run
rspec let_bang_spec.rb
- Then
- the examples should all pass
Last published over 2 years ago by dchelimsky.