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require 'lru_redux'
require 'minitest/autorun'
require 'minitest/pride'
class CacheTest < Minitest::Test
def setup
@c = LruRedux::Cache.new(3)
end
def teardown
assert_equal true, @c.send(:valid?)
end
def test_drops_old
@c[:a] = 1
@c[:b] = 2
@c[:c] = 3
@c[:d] = 4
assert_equal [[:d,4],[:c,3],[:b,2]], @c.to_a
assert_nil @c[:a]
end
def test_fetch
@c[:a] = nil
@c[:b] = 2
assert_equal @c.fetch(:a){1}, nil
assert_equal @c.fetch(:c){3}, 3
assert_equal [[:a,nil],[:b,2]], @c.to_a
end
def test_getset
assert_equal @c.getset(:a){1}, 1
@c.getset(:b){2}
assert_equal @c.getset(:a){11}, 1
@c.getset(:c){3}
assert_equal @c.getset(:d){4}, 4
assert_equal [[:d,4],[:c,3],[:a,1]], @c.to_a
end
def test_pushes_lru_to_back
@c[:a] = 1
@c[:b] = 2
@c[:c] = 3
@c[:a]
@c[:d] = 4
assert_equal [[:d,4],[:a,1],[:c,3]], @c.to_a
assert_nil @c[:b]
end
def test_delete
@c[:a] = 1
@c[:b] = 2
@c[:c] = 3
@c.delete(:a)
assert_equal [[:c,3],[:b,2]], @c.to_a
assert_nil @c[:a]
# Regression test for a bug in the legacy delete method
@c.delete(:b)
@c[:d] = 4
@c[:e] = 5
@c[:f] = 6
assert_equal [[:f,6],[:e,5],[:d,4]], @c.to_a
assert_nil @c[:b]
end
def test_key?
@c[:a] = 1
@c[:b] = 2
assert_equal true, @c.key?(:a)
assert_equal false, @c.key?(:c)
end
def test_update
@c[:a] = 1
@c[:b] = 2
@c[:c] = 3
@c[:a] = 99
assert_equal [[:a,99],[:c,3],[:b,2]], @c.to_a
end
def test_clear
@c[:a] = 1
@c[:b] = 2
@c[:c] = 3
@c.clear
assert_equal [], @c.to_a
end
def test_grow
@c[:a] = 1
@c[:b] = 2
@c[:c] = 3
@c.max_size = 4
@c[:d] = 4
assert_equal [[:d,4],[:c,3],[:b,2],[:a,1]], @c.to_a
end
def test_shrink
@c[:a] = 1
@c[:b] = 2
@c[:c] = 3
@c.max_size = 1
assert_equal [[:c,3]], @c.to_a
end
def test_each
@c.max_size = 2
@c[:a] = 1
@c[:b] = 2
@c[:c] = 3
pairs = []
@c.each do |pair|
pairs << pair
end
assert_equal [[:c,3],[:b, 2]], pairs
end
end
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