1 files changed, 84 insertions, 0 deletions
diff --git a/tests/config/lru.test.lua b/tests/config/lru.test.lua
new file mode 100644
index 0000000..324d636
--- /dev/null
+++ b/tests/config/lru.test.lua
@@ -0,0 +1,84 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+local ffi = require('ffi')
+
+-- Test LRU interface
+local function test_lru()
+	local capacity = 1024
+	local lru = kres.lru(capacity)
+	local dict = {
+		"catagmatic", "prevaricator", "statoscope", "workhand", "benzamide",
+		"alluvia", "fanciful", "bladish", "Tarsius", "unfast", "appropriative",
+		"seraphically", "monkeypod", "deflectometer", "tanglesome", "zodiacal",
+		"physiologically", "economizer", "forcepslike", "betrumpet",
+		"Danization", "broadthroat", "randir", "usherette", "nephropyosis",
+		"hematocyanin", "chrysohermidin", "uncave", "mirksome", "podophyllum",
+		"siphonognathous", "indoor", "featheriness", "forwardation",
+		"archruler", "soricoid", "Dailamite", "carmoisin", "controllability",
+		"unpragmatical", "childless", "transumpt", "productive",
+		"thyreotoxicosis", "oversorrow", "disshadow", "osse", "roar",
+		"pantomnesia", "talcer", "hydrorrhoea", "Satyridae", "undetesting",
+		"smoothbored", "widower", "sivathere", "pendle", "saltation",
+		"autopelagic", "campfight", "unexplained", "Macrorhamphosus",
+		"absconsa", "counterflory", "interdependent", "triact", "reconcentration",
+		"oversharpness", "sarcoenchondroma", "superstimulate", "assessory",
+		"pseudepiscopacy", "telescopically", "ventriloque", "politicaster",
+		"Caesalpiniaceae", "inopportunity", "Helion", "uncompatible",
+		"cephaloclasia", "oversearch", "Mahayanistic", "quarterspace",
+		"bacillogenic", "hamartite", "polytheistical", "unescapableness",
+		"Pterophorus", "cradlemaking", "Hippoboscidae", "overindustrialize",
+		"perishless", "cupidity", "semilichen", "gadge", "detrimental",
+		"misencourage", "toparchia", "lurchingly", "apocatastasis"
+	}
+
+	-- Check that key insertion works
+	local inserted = 0
+	for i, word in ipairs(dict) do
+		if lru:set(word, i) then
+			if lru:get(word) == i then
+				inserted = inserted + 1
+			end
+		end
+	end
+
+	is(inserted, #dict, 'all inserted keys can be retrieved')
+
+	-- Check that using binary data as keys works
+	local badinserts = 0
+	for i, word in ipairs(dict) do
+		local word_len = #word
+		word = ffi.cast('char *', word)
+		if lru:set(word, i, word_len) then
+			if lru:get(word, word_len) ~= i then
+				badinserts = badinserts + 1
+			end
+		end
+	end
+
+	is(badinserts, 0, 'insertion works for binary keys')
+
+	-- Sanity check that non-existent keys cannot be retrieved
+	local missing = "not in lru"
+	is(lru:get(missing, #missing, false), nil, 'key that wasnt inserted cannot be retrieved')
+
+	-- Test whether key eviction works and LRU is able to insert past the capacity
+	badinserts = 0
+	for i = 0, capacity do
+		local word = dict[1] .. tostring(i)
+		if lru:set(word, i) then
+			if lru:get(word) ~= i then
+				badinserts = badinserts + 1
+			end
+		end
+	end
+
+	is(badinserts, 0, 'insertion works for more keys than LRU capacity')
+
+	-- Delete and GC
+	lru = nil -- luacheck: ignore 311
+	collectgarbage()
+	collectgarbage()
+end
+
+return {
+	test_lru,
+}