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// Cannot implicitly shard accessed collections because of collection existing when none
// expected.
// @tags: [assumes_no_implicit_collection_creation_after_drop, requires_non_retryable_commands]
// This is a regression test for SERVER-21545.
//
// Tests that a collMod with a bad specification does not cause any changes, and does not crash the
// server.
(function() {
"use strict";
var collName = "collModBadSpec";
var coll = db.getCollection(collName);
coll.drop();
assert.commandWorked(db.createCollection(collName));
// Get the original collection options for the collection.
var originalResult = db.getCollectionInfos({name: collName});
// Issue an invalid command.
assert.commandFailed(coll.runCommand("collMod", {validationLevel: "off", unknownField: "x"}));
// Make sure the options are unchanged.
var newResult = db.getCollectionInfos({name: collName});
assert.eq(originalResult, newResult);
})();
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