local serialization = require "util.serialization";

describe("util.serialization", function ()

	describe("serialize", function ()

		it("makes a string", function ()

			assert.is_string(serialization.serialize({}));

			assert.is_string(serialization.serialize(nil));

			assert.is_string(serialization.serialize(1));

			assert.is_string(serialization.serialize(true));

		end);

		it("rejects function by default", function ()

			assert.has_error(function ()

				serialization.serialize(function () end)

			end);

		end);

		it("makes a string in debug mode", function ()

			assert.is_string(serialization.serialize(function () end, "debug"));

		end);

		it("rejects cycles", function ()

			assert.has_error(function ()

				local t = {}

				t[t] = { t };

				serialization.serialize(t)

			end);

			-- also with multirefs allowed

			assert.has_error(function ()

				local t = {}

				t[t] = { t };

				serialization.serialize(t, { multirefs = true })

			end);

		end);

		it("rejects multiple references to same table", function ()

			assert.has_error(function ()

				local t1 = {};

				local t2 = { t1, t1 };

				serialization.serialize(t2, { multirefs = false });

			end);

		end);

		it("optionally allows multiple references to same table", function ()

			assert.has_error(function ()

				local t1 = {};

				local t2 = { t1, t1 };

				serialization.serialize(t2, { multirefs = true });

			end);

		end);

		it("roundtrips", function ()

			local function test(data)

				local serialized = serialization.serialize(data);

				assert.is_string(serialized);

				local deserialized, err = serialization.deserialize(serialized);

				assert.same(data, deserialized, err);

			end

			test({});

			test({hello="world"});

			test("foobar")

			test("\0\1\2\3");

			test("nödåtgärd");

			test({1,2,3,4});

			test({foo={[100]={{"bar"},{baz=1}}}});

			test({["goto"] = {["function"]={["do"]="keywords"}}});

		end);

		it("can serialize with metatables", function ()

			local s = serialization.new({ freeze = true });

			local t = setmetatable({ a = "hi" }, { __freeze = function (t) return { t.a } end });

			local rt = serialization.deserialize(s(t));

			assert.same({"hi"}, rt);

		end);

	end);

end);