Port tests to the busted test runner

spec/util_uuid_spec.lua

@@ -0,0 +1,31 @@
+-- This tests the format, not the randomness
+
+local uuid = require "util.uuid";
+
+describe("util.uuid", function()
+	describe("#generate()", function()
+		it("should work follow the UUID pattern", function()
+			-- https://tools.ietf.org/html/rfc4122#section-4.4
+
+			local pattern = "^" .. table.concat({
+				string.rep("%x", 8),
+				string.rep("%x", 4),
+				"4" .. -- version
+				string.rep("%x", 3),
+				"[89ab]" .. -- reserved bits of 1 and 0
+				string.rep("%x", 3),
+				string.rep("%x", 12),
+			}, "%-") .. "$";
+
+			for _ = 1, 100 do
+				assert.is_string(uuid.generate():match(pattern));
+			end
+		end);
+	end);
+
+	describe("#seed()", function()
+		it("should return nothing", function()
+			assert.is_nil(uuid.seed("random string here"), "seed doesn't return anything");
+		end);
+	end);
+end);