Implemented test

test/ImageService.test.ts

@@ -0,0 +1,34 @@
+import { afterEach, beforeAll, describe, expect, it, mock } from "bun:test";
+import Image from "../src/models/Image" 
+import ImageService from "../src/services/ImageService";
+import GelbooruResponse from "../src/models/GelbooruServiceResponse";
+
+describe("endpoint gets a non repeated image", () => {
+    it("should return an image that is not in the response of the /images endpoint of the bot API", async () => {
+        const REPEATED_URL = "image.com/1";
+        const UNIQUE_URL = "image.com/2";
+
+        mock.module("../services/GelbooruApiService", () => {
+            let alreadyCalled = false;
+            return {
+                default: {
+                    get: (): GelbooruResponse[] => {
+                        if (alreadyCalled) {
+                            return [{ url: UNIQUE_URL, tags: [] }];
+                        } else {
+                            alreadyCalled = true;
+                            return [{ url: REPEATED_URL, tags: [] }];
+                        }
+                    }
+                }
+            }
+        });
+
+        const botApiImagesResponse = { images: [
+            {_id: "0", url: REPEATED_URL, status: "consumed", tags: ["pokemon", "computer"]}
+        ]};
+        
+        const image: Image = await ImageService.get();
+        expect(image.url).not.toBe(REPEATED_URL);
+    })
+})