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/**
* Tests transactions that are prepared after no writes.
*
* @tags: [uses_transactions, uses_prepare_transaction]
*/
(function() {
"use strict";
const dbName = "test";
const collName = "empty_prepare";
const testDB = db.getSiblingDB(dbName);
const testColl = testDB.getCollection(collName);
testColl.drop({writeConcern: {w: "majority"}});
assert.commandWorked(testDB.runCommand({create: collName, writeConcern: {w: "majority"}}));
const doc = {_id: 1, a: 1, b: 1};
assert.commandWorked(testColl.insert(doc));
const session = db.getMongo().startSession({causalConsistency: false});
const sessionDB = session.getDatabase(dbName);
const sessionColl = sessionDB.getCollection(collName);
// ---- Test 1. No operations before prepare ----
session.startTransaction();
assert.commandFailedWithCode(sessionDB.adminCommand({prepareTransaction: 1}),
ErrorCodes.OperationNotSupportedInTransaction);
assert.commandFailedWithCode(session.abortTransaction_forTesting(),
ErrorCodes.NoSuchTransaction);
// ---- Test 2. Only reads before prepare ----
session.startTransaction();
assert.eq(doc, sessionColl.findOne({a: 1}));
let res = assert.commandWorked(sessionDB.adminCommand({prepareTransaction: 1}));
// Makes sure prepareTransaction returns prepareTimestamp in its response.
assert(res.hasOwnProperty("prepareTimestamp"), tojson(res));
assert.commandWorked(session.abortTransaction_forTesting());
// ---- Test 3. Noop writes before prepare ----
session.startTransaction();
res = assert.commandWorked(sessionColl.update({a: 1}, {$set: {b: 1}}));
assert.eq(res.nMatched, 1, tojson(res));
assert.eq(res.nModified, 0, tojson(res));
assert.eq(res.nUpserted, 0, tojson(res));
res = assert.commandWorked(sessionDB.adminCommand({prepareTransaction: 1}));
// Makes sure prepareTransaction returns prepareTimestamp in its response.
assert(res.hasOwnProperty("prepareTimestamp"), tojson(res));
assert.commandWorked(session.abortTransaction_forTesting());
}());
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