diff --git a/src/entities/Font/model/store/appliedFontsStore/appliedFontStore.test.ts b/src/entities/Font/model/store/appliedFontsStore/appliedFontStore.test.ts
index f2a116e..e1740f7 100644
--- a/src/entities/Font/model/store/appliedFontsStore/appliedFontStore.test.ts
+++ b/src/entities/Font/model/store/appliedFontsStore/appliedFontStore.test.ts
@@ -12,9 +12,12 @@ import { AppliedFontsManager } from './appliedFontsStore.svelte';
 describe('AppliedFontsManager', () => {
     let manager: AppliedFontsManager;
     let mockFontFaceSet: any;
+    let mockFetch: any;
+    let failUrls: Set<string>;
 
     beforeEach(() => {
         vi.useFakeTimers();
+        failUrls = new Set();
 
         mockFontFaceSet = {
             add: vi.fn(),
@@ -22,11 +25,13 @@ describe('AppliedFontsManager', () => {
         };
 
         // 1. Properly mock FontFace as a constructor function
-        const MockFontFace = vi.fn(function(this: any, name: string, url: string) {
+        // The actual implementation passes buffer (ArrayBuffer) as second arg, not URL string
+        const MockFontFace = vi.fn(function(this: any, name: string, bufferOrUrl: ArrayBuffer | string) {
             this.name = name;
-            this.url = url;
+            this.bufferOrUrl = bufferOrUrl;
             this.load = vi.fn().mockImplementation(() => {
-                if (url.includes('fail')) return Promise.reject(new Error('Load failed'));
+                // For error tests, we track which URLs should fail via failUrls
+                // The fetch mock will have already rejected for those URLs
                 return Promise.resolve(this);
             });
         });
@@ -44,18 +49,37 @@ describe('AppliedFontsManager', () => {
             randomUUID: () => '11111111-1111-1111-1111-111111111111' as any,
         });
 
+        // 3. Mock fetch to return fake ArrayBuffer data
+        mockFetch = vi.fn((url: string) => {
+            if (failUrls.has(url)) {
+                return Promise.reject(new Error('Network error'));
+            }
+            return Promise.resolve({
+                ok: true,
+                status: 200,
+                arrayBuffer: () => Promise.resolve(new ArrayBuffer(8)),
+                clone: () => ({
+                    ok: true,
+                    status: 200,
+                    arrayBuffer: () => Promise.resolve(new ArrayBuffer(8)),
+                }),
+            } as Response);
+        });
+        vi.stubGlobal('fetch', mockFetch);
+
         manager = new AppliedFontsManager();
     });
 
     afterEach(() => {
         vi.clearAllTimers();
         vi.useRealTimers();
+        vi.unstubAllGlobals();
     });
 
     it('should batch multiple font requests into a single process', async () => {
         const configs = [
-            { id: 'lato-400', name: 'Lato', url: 'lato.ttf', weight: 400 },
-            { id: 'lato-700', name: 'Lato', url: 'lato-bold.ttf', weight: 700 },
+            { id: 'lato-400', name: 'Lato', url: 'https://example.com/lato.ttf', weight: 400 },
+            { id: 'lato-700', name: 'Lato', url: 'https://example.com/lato-bold.ttf', weight: 700 },
         ];
 
         manager.touch(configs);
@@ -71,7 +95,10 @@ describe('AppliedFontsManager', () => {
         // Suppress expected console error for clean test logs
         const spy = vi.spyOn(console, 'error').mockImplementation(() => {});
 
-        const config = { id: 'broken', name: 'Broken', url: 'fail.ttf', weight: 400 };
+        const failUrl = 'https://example.com/fail.ttf';
+        failUrls.add(failUrl);
+
+        const config = { id: 'broken', name: 'Broken', url: failUrl, weight: 400 };
 
         manager.touch([config]);
         await vi.advanceTimersByTimeAsync(50);
@@ -81,7 +108,7 @@ describe('AppliedFontsManager', () => {
     });
 
     it('should purge fonts after TTL expires', async () => {
-        const config = { id: 'ephemeral', name: 'Temp', url: 'temp.ttf', weight: 400 };
+        const config = { id: 'ephemeral', name: 'Temp', url: 'https://example.com/temp.ttf', weight: 400 };
 
         manager.touch([config]);
         await vi.advanceTimersByTimeAsync(50);
@@ -96,7 +123,7 @@ describe('AppliedFontsManager', () => {
     });
 
     it('should NOT purge fonts that are still being "touched"', async () => {
-        const config = { id: 'active', name: 'Active', url: 'active.ttf', weight: 400 };
+        const config = { id: 'active', name: 'Active', url: 'https://example.com/active.ttf', weight: 400 };
 
         manager.touch([config]);
         await vi.advanceTimersByTimeAsync(50);