tests: add multiple reactions and delete multiple messages tests

tests/messages/delete_messages.ts

@@ -0,0 +1,59 @@
+import {cache, delay, deleteMessage, deleteMessages, sendMessage} from "../../mod.ts";
+import { defaultTestOptions, tempData } from "../ws/start_bot.ts";
+import { assertExists } from "../deps.ts";
+
+async function ifItFailsBlameWolf(reason?: string) {
+  const message = await sendMessage(tempData.channelId, "Hello World!");
+
+  // Assertions
+  assertExists(message);
+  // Delay the execution by 5 seconds to allow MESSAGE_CREATE event to be processed
+  await delay(5000);
+  // Make sure the message was created.
+  if (!cache.messages.has(message.id)) {
+    throw new Error(
+      "The message seemed to be sent but it was not cached.",
+    );
+  }
+
+  const secondMessage = await sendMessage(tempData.channelId, "Hello World 2!");
+
+  // Assertions
+  assertExists(secondMessage);
+  // Delay the execution by 5 seconds to allow MESSAGE_CREATE event to be processed
+  await delay(5000);
+  // Make sure the message was created.
+  if (!cache.messages.has(secondMessage.id)) {
+    throw new Error(
+        "The message seemed to be sent but it was not cached.",
+    );
+  }
+
+  // Delete the message now
+  await deleteMessages(tempData.channelId, [message.id,secondMessage.id], reason);
+
+  // Wait 5 seconds to give it time for MESSAGE_DELETE event
+  await delay(5000);
+  // Make sure it is gone from cache
+  if (cache.messages.has(message.id) || cache.messages.has(secondMessage.id)) {
+    throw new Error(
+      "The message should have been deleted but it is still in cache.",
+    );
+  }
+}
+
+Deno.test({
+  name: "[message] delete messages without a reason.",
+  async fn() {
+    await ifItFailsBlameWolf();
+  },
+  ...defaultTestOptions,
+});
+
+Deno.test({
+  name: "[message] delete messages with a reason.",
+  async fn() {
+    await ifItFailsBlameWolf( "with a reason");
+  },
+  ...defaultTestOptions,
+});