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test(NODE-7513): relax regression test for emptyGetMore #4916

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tadjik1 merged 3 commits into from
Apr 14, 2026
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test(NODE-7513): relax regression test for emptyGetMore #4916

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test(NODE-7513): relax regression test for emptyGetMore
tadjik1 Apr 10, 2026
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update the comment
tadjik1 Apr 10, 2026
5e55f92
modify test title, make it clear what is tested and how
tadjik1 Apr 13, 2026
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10 changes: 4 additions & 6 deletions test/integration/crud/find.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,6 @@ import * as sinon from 'sinon';

import {
Code,
CursorResponse,
Long,
type MongoClient,
MongoServerError,
Expand Down Expand Up @@ -1083,18 +1082,17 @@ describe('Find', function () {
await collection.deleteMany({});
await collection.insertMany(Array.from({ length: 4 }, (_, i) => ({ x: i })));

const getMoreSpy = sinon.spy(CursorResponse, 'emptyGetMore', ['get']);

const cursor = collection.find({}, { batchSize: 1, limit: 3 });
// emptyGetMore is used internally after limit + 1 documents have been iterated
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await cursor.next();
await cursor.next();
await cursor.next();
await cursor.next();

// assert that `emptyGetMore` is called. if it is not, this test
// always passes, even without the fix in NODE-6878.
expect(getMoreSpy.get).to.have.been.called;
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dariakp marked this conversation as resolved.
// On servers < 9.0, mongos returns a non-zero cursorId even after the limit
// is satisfied, so the driver uses CursorResponse.emptyGetMore to avoid a
// wasted getMore. On 9.0+, mongos returns cursorId: 0 when the limit is
// reached. In both cases, rewinding and re-iterating the cursor must work.

cursor.rewind();

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