tests: add channels types (#840)

tests/channels/get_channel.ts

@@ -0,0 +1,39 @@
+import { cache } from "../../src/cache.ts";
+import { createChannel } from "../../src/helpers/channels/create_channel.ts";
+import { deleteChannel } from "../../src/helpers/channels/delete_channel.ts";
+import { defaultTestOptions, tempData } from "../ws/start_bot.ts";
+import { delayUntil } from "../util/delay_until.ts";
+import {editChannel} from "../../src/helpers/channels/edit_channel.ts";
+import {assertEquals} from "../deps.ts";
+import {getChannel} from "../../src/helpers/channels/get_channel.ts";
+import {botId} from "../../src/bot.ts";
+
+Deno.test({
+  name: "[channel] get a channel",
+  async fn() {
+    // Create the necessary channels
+    const channel = await createChannel(tempData.guildId, {
+      name: "get-channel",
+    });
+    // wait 5 seconds to give it time for CHANNEL_CREATE event
+    await delayUntil(3000, () => cache.channels.has(channel.id));
+    // Make sure the channel was created.
+    if (!cache.channels.has(channel.id)) {
+      throw new Error(
+          "The channel should have been created but it is not in the cache.",
+      );
+    }
+
+    cache.channels.delete(channel.id);
+
+    // Delete the channel now without a reason
+    await getChannel(channel.id);
+    await delayUntil(3000, () => cache.channels.has(channel.id));
+
+    assertEquals(
+        cache.channels.has(channel.id),
+        true,
+    );
+  },
+  ...defaultTestOptions,
+});