117 lines
3.1 KiB
Ruby
117 lines
3.1 KiB
Ruby
require 'minitest/autorun'
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require 'prism'
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class CacheStoreTest < Minitest::Test
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def setup
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@store = Prism::Cache::MemoryStore.new
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end
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def test_write_then_read_round_trips
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@store.write('key', 'value')
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assert_equal 'value', @store.read('key')
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end
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def test_read_of_missing_key_is_nil
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assert_nil @store.read('missing')
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end
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def test_keys_are_coerced_to_string
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@store.write(:sym_key, 'value')
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assert_equal 'value', @store.read('sym_key')
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end
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def test_fetch_computes_and_stores_on_miss
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calls = 0
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3.times { @store.fetch('k') { calls += 1; 'computed' } }
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assert_equal 1, calls
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end
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def test_fetch_returns_existing_value_without_yielding_on_hit
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@store.write('k', 'preset')
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result = @store.fetch('k') { raise 'must not be called' }
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assert_equal 'preset', result
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end
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def test_delete_removes_the_entry
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@store.write('k', 'v')
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assert @store.delete('k')
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assert_nil @store.read('k')
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end
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def test_delete_of_missing_key_returns_falsey
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refute @store.delete('missing')
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end
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def test_exist_reflects_presence
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refute @store.exist?('k')
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@store.write('k', 'v')
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assert @store.exist?('k')
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end
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def test_clear_empties_the_store
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@store.write('a', 1)
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@store.write('b', 2)
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@store.clear
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assert_equal 0, @store.size
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end
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def test_expires_in_makes_the_entry_unreadable_afterwards
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@store.write('k', 'v', expires_in: 0)
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sleep 0.01
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assert_nil @store.read('k')
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end
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def test_delete_matched_removes_keys_matching_a_regexp
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@store.write('posts/1', 'a')
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@store.write('posts/2', 'b')
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@store.write('users/1', 'c')
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@store.delete_matched(/\Aposts\//)
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assert_nil @store.read('posts/1')
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assert_nil @store.read('posts/2')
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assert_equal 'c', @store.read('users/1')
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end
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def test_default_store_is_a_memory_store_singleton
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assert_same Prism::Cache.store, Prism::Cache.store
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assert_instance_of Prism::Cache::MemoryStore, Prism::Cache.store
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end
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def test_unbounded_store_never_evicts
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store = Prism::Cache::MemoryStore.new
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50.times { |i| store.write("k#{i}", i) }
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assert_equal 50, store.size
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end
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def test_max_size_evicts_the_least_recently_used_entry_on_write
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store = Prism::Cache::MemoryStore.new(max_size: 2)
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store.write('a', 1)
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store.write('b', 2)
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store.write('c', 3)
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assert_equal 2, store.size
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assert_nil store.read('a')
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assert_equal 2, store.read('b')
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assert_equal 3, store.read('c')
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end
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def test_reading_a_key_protects_it_from_eviction
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store = Prism::Cache::MemoryStore.new(max_size: 2)
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store.write('a', 1)
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store.write('b', 2)
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store.read('a') # bump 'a' to most-recently-used, 'b' is now the LRU one
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store.write('c', 3)
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assert_equal 1, store.read('a')
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assert_nil store.read('b')
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assert_equal 3, store.read('c')
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end
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def test_rewriting_an_existing_key_does_not_grow_the_store
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store = Prism::Cache::MemoryStore.new(max_size: 2)
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store.write('a', 1)
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store.write('b', 2)
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store.write('a', 'updated')
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assert_equal 2, store.size
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assert_equal 'updated', store.read('a')
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assert_equal 2, store.read('b')
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end
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end
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