tests: add all messages tests

tests/messages/get_reactions.ts

@@ -0,0 +1,39 @@
+import {
+  addReaction,
+  cache,
+  delay,
+  getReactions,
+  sendMessage,
+} from "../../mod.ts";
+import { defaultTestOptions, tempData } from "../ws/start_bot.ts";
+import { assertEquals, assertExists } from "../deps.ts";
+
+Deno.test({
+  name: "[message] fetch reactions",
+  async fn() {
+    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.",
+      );
+    }
+
+    await addReaction(message.channelId, message.id, "❤");
+
+    // Fetch the message
+    const fetchedReactions = await getReactions(
+      tempData.channelId,
+      message.id,
+      "❤",
+    );
+    // Check if getMessage has worked
+    assertEquals(fetchedReactions.size, 1);
+  },
+  ...defaultTestOptions,
+});