1 files changed, 309 insertions, 0 deletions
diff --git a/tests/test_util_cache.lua b/tests/test_util_cache.lua
new file mode 100644
index 00000000..4240c433
--- /dev/null
+++ b/tests/test_util_cache.lua
@@ -0,0 +1,309 @@
+function new(new)
+	local c = new(5);
+
+	local function expect_kv(key, value, actual_key, actual_value)
+		assert_equal(key, actual_key, "key incorrect");
+		assert_equal(value, actual_value, "value incorrect");
+	end
+
+	expect_kv(nil, nil, c:head());
+	expect_kv(nil, nil, c:tail());
+
+	assert_equal(c:count(), 0);
+
+	c:set("one", 1)
+	assert_equal(c:count(), 1);
+	expect_kv("one", 1, c:head());
+	expect_kv("one", 1, c:tail());
+
+	c:set("two", 2)
+	expect_kv("two", 2, c:head());
+	expect_kv("one", 1, c:tail());
+
+	c:set("three", 3)
+	expect_kv("three", 3, c:head());
+	expect_kv("one", 1, c:tail());
+
+	c:set("four", 4)
+	c:set("five", 5);
+	assert_equal(c:count(), 5);
+	expect_kv("five", 5, c:head());
+	expect_kv("one", 1, c:tail());
+
+	c:set("foo", nil);
+	assert_equal(c:count(), 5);
+	expect_kv("five", 5, c:head());
+	expect_kv("one", 1, c:tail());
+
+	assert_equal(c:get("one"), 1);
+	expect_kv("five", 5, c:head());
+	expect_kv("one", 1, c:tail());
+
+	assert_equal(c:get("two"), 2);
+	assert_equal(c:get("three"), 3);
+	assert_equal(c:get("four"), 4);
+	assert_equal(c:get("five"), 5);
+
+	assert_equal(c:get("foo"), nil);
+	assert_equal(c:get("bar"), nil);
+
+	c:set("six", 6);
+	assert_equal(c:count(), 5);
+	expect_kv("six", 6, c:head());
+	expect_kv("two", 2, c:tail());
+
+	assert_equal(c:get("one"), nil);
+	assert_equal(c:get("two"), 2);
+	assert_equal(c:get("three"), 3);
+	assert_equal(c:get("four"), 4);
+	assert_equal(c:get("five"), 5);
+	assert_equal(c:get("six"), 6);
+
+	c:set("three", nil);
+	assert_equal(c:count(), 4);
+
+	assert_equal(c:get("one"), nil);
+	assert_equal(c:get("two"), 2);
+	assert_equal(c:get("three"), nil);
+	assert_equal(c:get("four"), 4);
+	assert_equal(c:get("five"), 5);
+	assert_equal(c:get("six"), 6);
+
+	c:set("seven", 7);
+	assert_equal(c:count(), 5);
+
+	assert_equal(c:get("one"), nil);
+	assert_equal(c:get("two"), 2);
+	assert_equal(c:get("three"), nil);
+	assert_equal(c:get("four"), 4);
+	assert_equal(c:get("five"), 5);
+	assert_equal(c:get("six"), 6);
+	assert_equal(c:get("seven"), 7);
+
+	c:set("eight", 8);
+	assert_equal(c:count(), 5);
+
+	assert_equal(c:get("one"), nil);
+	assert_equal(c:get("two"), nil);
+	assert_equal(c:get("three"), nil);
+	assert_equal(c:get("four"), 4);
+	assert_equal(c:get("five"), 5);
+	assert_equal(c:get("six"), 6);
+	assert_equal(c:get("seven"), 7);
+	assert_equal(c:get("eight"), 8);
+
+	c:set("four", 4);
+	assert_equal(c:count(), 5);
+
+	assert_equal(c:get("one"), nil);
+	assert_equal(c:get("two"), nil);
+	assert_equal(c:get("three"), nil);
+	assert_equal(c:get("four"), 4);
+	assert_equal(c:get("five"), 5);
+	assert_equal(c:get("six"), 6);
+	assert_equal(c:get("seven"), 7);
+	assert_equal(c:get("eight"), 8);
+
+	c:set("nine", 9);
+	assert_equal(c:count(), 5);
+
+	assert_equal(c:get("one"), nil);
+	assert_equal(c:get("two"), nil);
+	assert_equal(c:get("three"), nil);
+	assert_equal(c:get("four"), 4);
+	assert_equal(c:get("five"), nil);
+	assert_equal(c:get("six"), 6);
+	assert_equal(c:get("seven"), 7);
+	assert_equal(c:get("eight"), 8);
+	assert_equal(c:get("nine"), 9);
+
+	do
+		local keys = { "nine", "four", "eight", "seven", "six" };
+		local values = { 9, 4, 8, 7, 6 };
+		local i = 0;
+		for k, v in c:items() do
+			i = i + 1;
+			assert_equal(k, keys[i]);
+			assert_equal(v, values[i]);
+		end
+		assert_equal(i, 5);
+
+		c:set("four", "2+2");
+		assert_equal(c:count(), 5);
+
+		assert_equal(c:get("one"), nil);
+		assert_equal(c:get("two"), nil);
+		assert_equal(c:get("three"), nil);
+		assert_equal(c:get("four"), "2+2");
+		assert_equal(c:get("five"), nil);
+		assert_equal(c:get("six"), 6);
+		assert_equal(c:get("seven"), 7);
+		assert_equal(c:get("eight"), 8);
+		assert_equal(c:get("nine"), 9);
+	end
+
+	do
+		local keys = { "four", "nine", "eight", "seven", "six" };
+		local values = { "2+2", 9, 8, 7, 6 };
+		local i = 0;
+		for k, v in c:items() do
+			i = i + 1;
+			assert_equal(k, keys[i]);
+			assert_equal(v, values[i]);
+		end
+		assert_equal(i, 5);
+
+		c:set("foo", nil);
+		assert_equal(c:count(), 5);
+
+		assert_equal(c:get("one"), nil);
+		assert_equal(c:get("two"), nil);
+		assert_equal(c:get("three"), nil);
+		assert_equal(c:get("four"), "2+2");
+		assert_equal(c:get("five"), nil);
+		assert_equal(c:get("six"), 6);
+		assert_equal(c:get("seven"), 7);
+		assert_equal(c:get("eight"), 8);
+		assert_equal(c:get("nine"), 9);
+	end
+
+	do
+		local keys = { "four", "nine", "eight", "seven", "six" };
+		local values = { "2+2", 9, 8, 7, 6 };
+		local i = 0;
+		for k, v in c:items() do
+			i = i + 1;
+			assert_equal(k, keys[i]);
+			assert_equal(v, values[i]);
+		end
+		assert_equal(i, 5);
+
+		c:set("four", nil);
+
+		assert_equal(c:get("one"), nil);
+		assert_equal(c:get("two"), nil);
+		assert_equal(c:get("three"), nil);
+		assert_equal(c:get("four"), nil);
+		assert_equal(c:get("five"), nil);
+		assert_equal(c:get("six"), 6);
+		assert_equal(c:get("seven"), 7);
+		assert_equal(c:get("eight"), 8);
+		assert_equal(c:get("nine"), 9);
+	end
+
+	do
+		local keys = { "nine", "eight", "seven", "six" };
+		local values = { 9, 8, 7, 6 };
+		local i = 0;
+		for k, v in c:items() do
+			i = i + 1;
+			assert_equal(k, keys[i]);
+			assert_equal(v, values[i]);
+		end
+		assert_equal(i, 4);
+	end
+
+	do
+		local evicted_key, evicted_value;
+		local c2 = new(3, function (_key, _value)
+			evicted_key, evicted_value = _key, _value;
+		end);
+		local function set(k, v, should_evict_key, should_evict_value)
+			evicted_key, evicted_value = nil, nil;
+			c2:set(k, v);
+			assert_equal(evicted_key, should_evict_key);
+			assert_equal(evicted_value, should_evict_value);
+		end
+		set("a", 1)
+		set("a", 1)
+		set("a", 1)
+		set("a", 1)
+		set("a", 1)
+
+		set("b", 2)
+		set("c", 3)
+		set("b", 2)
+		set("d", 4, "a", 1)
+		set("e", 5, "c", 3)
+	end
+
+	do
+		local evicted_key, evicted_value;
+		local c3 = new(1, function (_key, _value)
+			evicted_key, evicted_value = _key, _value;
+			if _key == "a" then
+				-- Sanity check for what we're evicting
+				assert_equal(_key, "a");
+				assert_equal(_value, 1);
+				-- We're going to block eviction of this key/value, so set to nil...
+				evicted_key, evicted_value = nil, nil;
+				-- Returning false to block eviction
+				return false
+			end
+		end);
+		local function set(k, v, should_evict_key, should_evict_value)
+			evicted_key, evicted_value = nil, nil;
+			local ret = c3:set(k, v);
+			assert_equal(evicted_key, should_evict_key);
+			assert_equal(evicted_value, should_evict_value);
+			return ret;
+		end
+		set("a", 1)
+		set("a", 1)
+		set("a", 1)
+		set("a", 1)
+		set("a", 1)
+
+		-- Our on_evict prevents "a" from being evicted, causing this to fail...
+		assert_equal(set("b", 2), false, "Failed to prevent eviction, or signal result");
+
+		expect_kv("a", 1, c3:head());
+		expect_kv("a", 1, c3:tail());
+
+		-- Check the final state is what we expect
+		assert_equal(c3:get("a"), 1);
+		assert_equal(c3:get("b"), nil);
+		assert_equal(c3:count(), 1);
+	end
+
+
+	local c4 = new(3, false);
+
+	assert_equal(c4:set("a", 1), true);
+	assert_equal(c4:set("a", 1), true);
+	assert_equal(c4:set("a", 1), true);
+	assert_equal(c4:set("a", 1), true);
+	assert_equal(c4:set("b", 2), true);
+	assert_equal(c4:set("c", 3), true);
+	assert_equal(c4:set("d", 4), false);
+	assert_equal(c4:set("d", 4), false);
+	assert_equal(c4:set("d", 4), false);
+
+	expect_kv("c", 3, c4:head());
+	expect_kv("a", 1, c4:tail());
+
+	local c5 = new(3, function (k, v)
+		if k == "a" then
+			return nil;
+		elseif k == "b" then
+			return true;
+		end
+		return false;
+	end);
+
+	assert_equal(c5:set("a", 1), true);
+	assert_equal(c5:set("a", 1), true);
+	assert_equal(c5:set("a", 1), true);
+	assert_equal(c5:set("a", 1), true);
+	assert_equal(c5:set("b", 2), true);
+	assert_equal(c5:set("c", 3), true);
+	assert_equal(c5:set("d", 4), true); -- "a" evicted (cb returned nil)
+	assert_equal(c5:set("d", 4), true); -- nop
+	assert_equal(c5:set("d", 4), true); -- nop
+	assert_equal(c5:set("e", 5), true); -- "b" evicted (cb returned true)
+	assert_equal(c5:set("f", 6), false); -- "c" won't evict (cb returned false)
+
+	expect_kv("e", 5, c5:head());
+	expect_kv("c", 3, c5:tail());
+
+end