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let_spec.rb
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let_spec.rb
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require 'spec_helper'
describe "#let" do
let(:counter, :another_counter) do
Class.new do
def initialize
@count = 0
end
def count
@count += 1
end
end.new
end
let(:nil_value) do
@nil_value_count += 1
nil
end
it "generates an instance method" do
counter.count.should eq(1)
end
it "caches the value" do
counter.count.should eq(1)
counter.count.should eq(2)
end
it "caches a nil value" do
@nil_value_count = 0
nil_value
nil_value
@nil_value_count.should eq(1)
end
it "caches multiple arguments separately" do
counter.should_not eq(another_counter)
end
end
describe "#let!" do
let!(:creator, :another_creator) do
Class.new do
@count = 0
def self.count
@count += 1
end
end
end
it "evaluates the value non-lazily" do
lambda { creator.count }.should_not raise_error
end
it "does not interfere between tests" do
creator.count.should eq(1)
end
it "caches multiple arguments separately" do
creator.should_not eq(another_creator)
end
end