Test partial upload cancellation

tests/test_upload_layer2.test.mjs

@@ -231,3 +231,32 @@ test('uploadViaVM: прерывание через signal', async () => {
   assert.equal(res.ok, false);
   assert.equal(res.aborted, true);
 });
+
+test('uploadViaVM: отмена после первого файла не начинает второй PUT', async () => {
+  installFetch(async (url, opts) => ({
+    ok: true,
+    json: async () => ({ ok: true, session: 'partial-sid', count: 1 }),
+  }));
+
+  const ac = new AbortController();
+  const statuses = [];
+  const files = [new File(['first'], 'first.txt'), new File(['second'], 'second.txt')];
+  const p = uploadViaVM(files, {
+    vmUploadUrl: 'https://vm-buffer/upload/',
+    signal: ac.signal,
+    onFileStatus: (idx, status) => statuses.push({ idx, status }),
+  });
+
+  await tick();
+  assert.equal(lastXHR.url.endsWith('_0'), true);
+  lastXHR.status = 201;
+  lastXHR.onload();
+  ac.abort();
+  const res = await p;
+
+  assert.equal(res.ok, false);
+  assert.equal(res.aborted, true);
+  assert.equal(fetchCalls.length, 1);
+  assert.equal(lastXHR.url.endsWith('_0'), true);
+  assert.ok(statuses.some(({ idx, status }) => idx === 0 && status.includes('Доставлен')));
+});