Use let and let! for data that is used across several examples in an example group. Use let! to define variables even if they are not referenced in some of the examples, e.g. when testing balancing negative cases. Do not overuse lets for primitive data, find the balance between frequency of use and complexity of the definition.
# bad
it 'finds shortest path' do
tree = Tree.new(1 => 2, 2 => 3, 2 => 6, 3 => 4, 4 => 5, 5 => 6)
expect(dijkstra.shortest_path(tree, from: 1, to: 6)).to eq([1, 2, 6])
end
it 'finds longest path' do
tree = Tree.new(1 => 2, 2 => 3, 2 => 6, 3 => 4, 4 => 5, 5 => 6)
expect(dijkstra.longest_path(tree, from: 1, to: 6)).to eq([1, 2, 3, 4, 5, 6])
end
# good
let(:tree) { Tree.new(1 => 2, 2 => 3, 2 => 6, 3 => 4, 4 => 5, 5 => 6) }
it 'finds shortest path' do
expect(dijkstra.shortest_path(tree, from: 1, to: 6)).to eq([1, 2, 6])
end
it 'finds longest path' do
expect(dijkstra.longest_path(tree, from: 1, to: 6)).to eq([1, 2, 3, 4, 5, 6])
end
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