🧪 [testing improvement] Add unit tests for usePdfStore toBlob helper

src/modules/pdf-forge/store/usePdfStore.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect, beforeEach, vi, afterEach } from 'vitest';
-import { usePdfStore } from './usePdfStore';
+import { usePdfStore, toBlob } from './usePdfStore';
 
 // Mock pdf-lib
 vi.mock('pdf-lib', () => {
@@ -52,6 +52,26 @@ describe('usePdfStore', () => {
     vi.restoreAllMocks();
   });
 
+  describe('toBlob', () => {
+    it('should convert a Uint8Array to a Blob with application/pdf type', () => {
+      const data = new Uint8Array([1, 2, 3, 4]);
+      const blob = toBlob(data);
+
+      expect(blob).toBeInstanceOf(Blob);
+      expect(blob.type).toBe('application/pdf');
+      expect(blob.size).toBe(4);
+    });
+
+    it('should handle an empty Uint8Array correctly', () => {
+      const emptyData = new Uint8Array([]);
+      const blob = toBlob(emptyData);
+
+      expect(blob).toBeInstanceOf(Blob);
+      expect(blob.type).toBe('application/pdf');
+      expect(blob.size).toBe(0);
+    });
+  });
+
   it('should have initial state', () => {
     const state = usePdfStore.getState();
     expect(state.task.operation).toBe('merge');

src/modules/pdf-forge/store/usePdfStore.ts

@@ -30,7 +30,7 @@ async function loadPdfPages(file: File): Promise<PdfPage[]> {
   }));
 }
 
-function toBlob(data: Uint8Array): Blob {
+export function toBlob(data: Uint8Array): Blob {
   return new Blob([data.buffer as ArrayBuffer], { type: 'application/pdf' });
 }