add channel overwrite has permission

tests/mod.test.ts

@@ -10,8 +10,12 @@ import {
   Intents,
   Role,
 } from "../mod.ts";
-import { createServer } from "../src/handlers/guild.ts";
+import { channelOverwriteHasPermission } from "../src/handlers/channel.ts";
+import { createGuildChannel, createServer } from "../src/handlers/guild.ts";
 import { Guild } from "../src/structures/guild.ts";
+import { OverwriteType } from "../src/types/guild.ts";
+import { Permissions } from "../src/types/permission.ts";
+import { cache } from "../src/utils/cache.ts";
 
 const token = Deno.env.get("DISCORD_TOKEN");
 if (!token) throw "Token is not provided";
@@ -99,6 +103,53 @@ Deno.test({
   ...testOptions,
 });
 
+Deno.test({
+  name: "channel overwrite has permission",
+  async fn() {
+    const guild = cache.guilds.get(guildID)!;
+    const channel = await createGuildChannel(guild, "testing", {
+      permission_overwrites: [
+        {
+          id: roleID,
+          type: OverwriteType.ROLE,
+          allow: ["VIEW_CHANNEL", "SEND_MESSAGES"],
+          deny: ["USE_EXTERNAL_EMOJIS"],
+        },
+      ],
+    });
+
+    assert(channel.id);
+    // Checks whether the role has these perms
+    assert(
+      channelOverwriteHasPermission(
+        guildID,
+        roleID,
+        channel.permission_overwrites || [],
+        [Permissions.VIEW_CHANNEL, Permissions.SEND_MESSAGES],
+      ),
+    );
+    // Checks if this permission was actually disabled
+    assert(
+      !channelOverwriteHasPermission(
+        guildID,
+        roleID,
+        channel.permission_overwrites || [],
+        [Permissions.USE_EXTERNAL_EMOJIS],
+      ),
+    );
+    // Checks if this permission is missing that was neither allowed nor denied
+    assert(
+      !channelOverwriteHasPermission(
+        guildID,
+        roleID,
+        channel.permission_overwrites || [],
+        [Permissions.MANAGE_MESSAGES],
+      ),
+    );
+  },
+  ...testOptions,
+});
+
 Deno.test({
   name: "delete a role from the guild",
   async fn() {