fix: improve unit tests style

tests/role/getAllRoles.ts

@@ -0,0 +1,11 @@
+import { assertEquals } from "../deps.ts";
+import { bot, guild } from "../mod.ts";
+
+Deno.test({
+  name: "[Role] get all roles on a server",
+  fn: async (t) => {
+    const roles = await bot.helpers.getRoles(guild.id);
+
+    assertEquals(bot.cache.guilds.get(guild.id)?.roles.size, roles.size);
+  },
+});