diff --git a/dbal/ts/src/blob/index.ts b/dbal/ts/src/blob/index.ts
index e6865bdd6..dc6da4b49 100644
--- a/dbal/ts/src/blob/index.ts
+++ b/dbal/ts/src/blob/index.ts
@@ -12,7 +12,6 @@ import { FilesystemStorage } from './filesystem-storage'
 /**
  * Factory function to create blob storage instances
  */
-// TODO: add tests for createBlobStorage (memory, s3, filesystem, unknown type).
 export function createBlobStorage(config: BlobStorageConfig): BlobStorage {
   switch (config.type) {
     case 'memory':
diff --git a/dbal/ts/tests/blob/index.test.ts b/dbal/ts/tests/blob/index.test.ts
new file mode 100644
index 000000000..951eedc79
--- /dev/null
+++ b/dbal/ts/tests/blob/index.test.ts
@@ -0,0 +1,38 @@
+import { describe, expect, it, vi } from 'vitest'
+import { createBlobStorage } from '../../src/blob'
+import { FilesystemStorage } from '../../src/blob/filesystem-storage'
+import { MemoryStorage } from '../../src/blob/memory-storage'
+import { S3Storage } from '../../src/blob/s3-storage'
+
+vi.mock('@aws-sdk/client-s3', () => ({
+  S3Client: class {},
+}), { virtual: true })
+
+describe('createBlobStorage', () => {
+  it.each([
+    {
+      config: { type: 'memory' as const },
+      expected: MemoryStorage,
+      description: 'memory storage',
+    },
+    {
+      config: { type: 'filesystem' as const, filesystem: { basePath: '/tmp/dbal-blob-test' } },
+      expected: FilesystemStorage,
+      description: 'filesystem storage',
+    },
+    {
+      config: { type: 's3' as const, s3: { bucket: 'test-bucket', region: 'us-east-1' } },
+      expected: S3Storage,
+      description: 's3 storage',
+    },
+  ])('creates $description', ({ config, expected }) => {
+    const storage = createBlobStorage(config)
+    expect(storage).toBeInstanceOf(expected)
+  })
+
+  it('throws for unknown type', () => {
+    expect(() => createBlobStorage({ type: 'unknown' as 'memory' })).toThrow(
+      'Unknown blob storage type: unknown'
+    )
+  })
+})