mongodb/jstests/change_streams/include_cluster_time.js

// Tests that each change in the stream will include the cluster time at which it happened.
//
// This test expects each change stream result to have an operationTime based on the clusterTime in
// the oplog entry. When operations get bundled into a transaction, their operationTime is instead
// based on the commit oplog entry, which would cause this test to fail.
// @tags: [change_stream_does_not_expect_txns]
(function() {
    "use strict";

    load("jstests/libs/change_stream_util.js");        // For assertInvalidateOp.
    load("jstests/libs/collection_drop_recreate.js");  // For assertDropAndRecreateCollection.

    // Drop and recreate the collections to be used in this set of tests.
    const coll = assertDropAndRecreateCollection(db, "include_cluster_time");

    const changeStream = coll.watch();

    const insertClusterTime =
        assert.commandWorked(coll.runCommand("insert", {documents: [{_id: 0}]})).operationTime;

    const updateClusterTime =
        assert
            .commandWorked(
                coll.runCommand("update", {updates: [{q: {_id: 0}, u: {$set: {updated: true}}}]}))
            .operationTime;

    const deleteClusterTime =
        assert.commandWorked(coll.runCommand("delete", {deletes: [{q: {_id: 0}, limit: 1}]}))
            .operationTime;

    const dropClusterTime =
        assert.commandWorked(db.runCommand({drop: coll.getName()})).operationTime;

    // Make sure each operation has a reasonable cluster time. Note that we should not assert
    // that the cluster times are equal, because the cluster time returned from the command is
    // generated by a second, independent read of the logical clock than the one used to
    // generate the oplog entry. It's possible that the system did something to advance the time
    // between the two reads of the clock.
    assert.soon(() => changeStream.hasNext());
    let next = changeStream.next();
    assert.eq(next.operationType, "insert");
    assert.lte(next.clusterTime, insertClusterTime);

    assert.soon(() => changeStream.hasNext());
    next = changeStream.next();
    assert.eq(next.operationType, "update");
    assert.lte(next.clusterTime, updateClusterTime);

    assert.soon(() => changeStream.hasNext());
    next = changeStream.next();
    assert.eq(next.operationType, "delete");
    assert.lte(next.clusterTime, deleteClusterTime);

    assert.soon(() => changeStream.hasNext());
    next = changeStream.next();
    assert.eq(next.operationType, "drop");
    assert.lte(next.clusterTime, dropClusterTime);

    assertInvalidateOp({cursor: changeStream, opType: "drop"});

    changeStream.close();
}());