diff --git a/src/services/__tests__/profile-synchronizer.service.spec.ts b/src/services/__tests__/profile-synchronizer.service.spec.ts
new file mode 100644
index 0000000..99570d5
--- /dev/null
+++ b/src/services/__tests__/profile-synchronizer.service.spec.ts
@@ -0,0 +1,146 @@
+import { BskyAgent } from "@atproto/api";
+import { Profile, Scraper } from "@the-convocation/twitter-scraper";
+import { mastodon } from "masto";
+
+import { updateCacheEntry } from "../../helpers/cache/update-cache-entry.js";
+import { makeBlobFromFile } from "../../helpers/medias/__tests__/helpers/make-blob-from-file.js";
+import { profileSynchronizerService } from "../profile-synchronizer.service.js";
+
+const constantsMock = jest.requireMock("../../constants.js");
+jest.mock("../../constants.js", () => ({}));
+
+jest.mock("../media-downloader.service.js", () => ({
+  mediaDownloaderService: jest
+    .fn()
+    .mockResolvedValue(makeBlobFromFile("image-png.png", "image/png")),
+}));
+
+const profileMock = {
+  avatar:
+    "https://pbs.twimg.com/profile_images/1234567890/1234567890_400x400.jpg",
+  banner: "https://pbs.twimg.com/profile_banners/1234567890/1234567890",
+  biography: "description",
+  birthday: undefined,
+  name: "name",
+} as Profile;
+
+jest.mock("../../helpers/cache/update-cache-entry.js", () => ({
+  updateCacheEntry: jest.fn(),
+}));
+
+const updateCacheEntryMock = updateCacheEntry as jest.Mock;
+
+jest.mock("../../helpers/medias/upload-bluesky-media.js", () => {
+  return {
+    uploadBlueskyMedia: jest.fn().mockResolvedValue({
+      success: true,
+      data: {
+        blob: {
+          original: "123456789",
+        },
+      },
+    }),
+  };
+});
+
+describe("profileSynchronizerService", () => {
+  // Twitter client
+  const twitterClient = new Scraper();
+  const getProfileSpy = jest.fn().mockResolvedValue(profileMock);
+  twitterClient.getProfile = getProfileSpy;
+
+  // Mastodon client
+  const updateMastodonProfileSpy = jest.fn();
+  const mastodonClient = {
+    v1: {
+      accounts: {
+        updateCredentials: updateMastodonProfileSpy,
+      },
+    },
+  } as unknown as mastodon.rest.Client;
+
+  // Bluesky client
+  const updateBlueskyProfileSpy = jest.fn();
+  const blueskyClient = {
+    upsertProfile: updateBlueskyProfileSpy,
+  } as unknown as BskyAgent;
+
+  // Actual tests
+  describe.each`
+    mastodonClient    | blueskyClient    | label
+    ${mastodonClient} | ${null}          | ${"mastodon"}
+    ${null}           | ${blueskyClient} | ${"bluesky"}
+    ${mastodonClient} | ${blueskyClient} | ${"mastodon & bluesky"}
+  `(
+    "when the following clients are available ($label)",
+    ({ mastodonClient, blueskyClient }) => {
+      describe.each`
+        label                | description | name     | picture  | header
+        ${"everything"}      | ${true}     | ${true}  | ${true}  | ${true}
+        ${"the description"} | ${true}     | ${false} | ${false} | ${false}
+        ${"the name"}        | ${false}    | ${true}  | ${false} | ${false}
+        ${"the picture"}     | ${false}    | ${false} | ${true}  | ${false}
+        ${"the banner"}      | ${false}    | ${false} | ${false} | ${true}
+        ${"nothing"}         | ${false}    | ${false} | ${false} | ${false}
+      `(
+        "when the profile sync will update $label",
+        ({ description, name, picture, header }) => {
+          beforeEach(async () => {
+            jest.clearAllMocks();
+
+            constantsMock.SYNC_PROFILE_DESCRIPTION = description;
+            constantsMock.SYNC_PROFILE_PICTURE = name;
+            constantsMock.SYNC_PROFILE_NAME = picture;
+            constantsMock.SYNC_PROFILE_HEADER = header;
+            constantsMock.TWITTER_HANDLE = "username";
+          });
+
+          it("should properly sync the profile", async () => {
+            await profileSynchronizerService(
+              twitterClient,
+              mastodonClient,
+              blueskyClient,
+            );
+
+            expect(getProfileSpy).toHaveBeenCalledTimes(1);
+
+            const noClientAvailable = !mastodonClient && !blueskyClient;
+            const profileUpdateDisabled =
+              !description && !name && !picture && !header;
+
+            if (profileUpdateDisabled || noClientAvailable) {
+              // No update
+              expect(updateMastodonProfileSpy).not.toHaveBeenCalled();
+              expect(updateBlueskyProfileSpy).not.toHaveBeenCalled();
+            } else {
+              if (mastodonClient && !blueskyClient) {
+                // Mastodon update
+                expect(updateMastodonProfileSpy).toHaveBeenCalledTimes(1);
+
+                // No Bluesky update
+                expect(updateBlueskyProfileSpy).not.toHaveBeenCalled();
+              }
+
+              if (!mastodonClient && blueskyClient) {
+                // Bluesky update
+                expect(updateBlueskyProfileSpy).toHaveBeenCalledTimes(1);
+
+                // No Mastodon update
+                expect(updateMastodonProfileSpy).not.toHaveBeenCalled();
+              }
+
+              if (mastodonClient && blueskyClient) {
+                // Both are updated
+                expect(updateMastodonProfileSpy).toHaveBeenCalledTimes(1);
+                expect(updateBlueskyProfileSpy).toHaveBeenCalledTimes(1);
+              }
+            }
+
+            // Always update the profile images hashes cache
+            expect(updateCacheEntryMock).toHaveBeenCalledTimes(1);
+          });
+        },
+      );
+    },
+  );
+});
diff --git a/src/services/profile-synchronizer.service.ts b/src/services/profile-synchronizer.service.ts
index f201bd7..af00a59 100644
--- a/src/services/profile-synchronizer.service.ts
+++ b/src/services/profile-synchronizer.service.ts
@@ -20,7 +20,7 @@ import {
   ProfileCache,
   SynchronizerResponse,
 } from "../types/index.js";
-import { mediaDownloaderService } from "./index.js";
+import { mediaDownloaderService } from "./media-downloader.service.js";
 
 /**
  * An async method in charge of dispatching profile synchronization tasks.
@@ -155,12 +155,10 @@ export const profileSynchronizerService = async (
 
   // Post bluesky updates if any
   if (Object.keys(params.bluesky).length && blueskyClient) {
-    await blueskyClient.upsertProfile((old) => {
-      return {
-        ...old,
-        ...params.bluesky,
-      };
-    });
+    await blueskyClient.upsertProfile((old) => ({
+      ...old,
+      ...params.bluesky,
+    }));
   }
 
   // Update profile images hash