chore(cli): clarify use of concurrency option

cli/src/index.ts

@@ -44,7 +44,7 @@ program
       .default(false),
   )
   .addOption(
-    new Option('-c, --concurrency', 'Number of assets to upload at the same time')
+    new Option('-c, --concurrency <number>', 'Number of assets to upload at the same time')
       .env('IMMICH_UPLOAD_CONCURRENCY')
       .default(4),
   )

e2e/src/cli/specs/upload.e2e-spec.ts

@@ -142,4 +142,42 @@ describe(`immich upload`, () => {
       expect(assets.length).toBe(9);
     });
   });
+
+  describe('immich upload --concurrency <number>', () => {
+    it('should work', async () => {
+      const { stderr, stdout, exitCode } = await immichCli([
+        'upload',
+        `${testAssetDir}/albums/nature/`,
+        '--concurrency',
+        '2',
+      ]);
+
+      expect(stderr).toBe('');
+      expect(stdout.split('\n')).toEqual(
+        expect.arrayContaining([expect.stringContaining('Successfully uploaded 9 assets')]),
+      );
+      expect(exitCode).toBe(0);
+
+      const assets = await getAllAssets({}, { headers: asKeyAuth(key) });
+      expect(assets.length).toBe(9);
+    });
+
+    it('should reject string argument', async () => {
+      const { stderr, exitCode } = await immichCli([
+        'upload',
+        `${testAssetDir}/albums/nature/`,
+        '--concurrency string',
+      ]);
+
+      expect(stderr).toContain('unknown option');
+      expect(exitCode).not.toBe(0);
+    });
+
+    it('should reject command without number', async () => {
+      const { stderr, exitCode } = await immichCli(['upload', `${testAssetDir}/albums/nature/`, '--concurrency']);
+
+      expect(stderr).toContain('argument missing');
+      expect(exitCode).not.toBe(0);
+    });
+  });
 });