tests: use delayUntil instead of delay

tests/messages/remove_reaction.ts

@@ -1,12 +1,7 @@
-import {
-  addReaction,
-  cache,
-  delay,
-  removeReaction,
-  sendMessage,
-} from "../../mod.ts";
+import { addReaction, cache, removeReaction, sendMessage } from "../../mod.ts";
 import { defaultTestOptions, tempData } from "../ws/start_bot.ts";
 import { assertEquals, assertExists } from "../deps.ts";
+import { delayUntil } from "../util/delay_until.ts";
 
 async function ifItFailsBlameWolf(type: "getter" | "raw") {
   const message = await sendMessage(tempData.channelId, "Hello World!");
@@ -14,7 +9,7 @@ async function ifItFailsBlameWolf(type: "getter" | "raw") {
   // Assertions
   assertExists(message);
   // Delay the execution by 5 seconds to allow MESSAGE_CREATE event to be processed
-  await delay(3000);
+  delayUntil(3000, () => cache.messages.has(message.id));
   // 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.");
@@ -23,7 +18,10 @@ async function ifItFailsBlameWolf(type: "getter" | "raw") {
   // Add reactions to the message
   await addReaction(message.channelId, message.id, "❤");
   // Delay the execution by 5 seconds to allow MESSAGE_REACTION_ALL event to be processed
-  await delay(3000);
+  delayUntil(
+    3000,
+    () => cache.messages.get(message.id)?.reactions?.length === 1,
+  );
 
   // Be sure that the message has the reactions
   assertEquals(await cache.messages.get(message.id)?.reactions?.length, 1);
@@ -35,7 +33,10 @@ async function ifItFailsBlameWolf(type: "getter" | "raw") {
   }
 
   // Delay the execution by 5 seconds to allow MESSAGE_REACTION_REMOVE_ALL event to be processed
-  await delay(3000);
+  delayUntil(
+    3000,
+    () => cache.messages.get(message.id)?.reactions === undefined,
+  );
 
   // Check if the reactions has been deleted
   assertEquals(await cache.messages.get(message.id)?.reactions, undefined);