/**
 * Ensures that the dropDatabase op can only be run if it's the single entry in an applyOps context.
 * Exercises that the operation can run even if it has to await replication of the intermediate
 * collection drops.
 *
 * @tags: [
 *   requires_replication,
 *   # dropDatabase can work in conjunction with other operations in 5.0.
 *   requires_fcv_53
 * ]
 */
(function() {
"use strict";

const rst = new ReplSetTest({nodes: 2});
rst.startSet();
rst.initiate();

const dbName = "dbDrop";
const collName = "coll";
const cmdNss = dbName + ".$cmd";
const primaryDB = rst.getPrimary().getDB(dbName);

primaryDB.createCollection(collName);

// Verify that dropDatabase is only supported if it's the only op entry.
assert.commandFailedWithCode(primaryDB.adminCommand({
    applyOps: [
        {op: "c", ns: cmdNss, o: {create: "collection"}},
        {op: "c", ns: cmdNss, o: {dropDatabase: 1}}
    ]
}),
                             6275900);

assert.contains(dbName, rst.getPrimary().getDBNames());
assert.sameMembers(primaryDB.getCollectionNames(), [collName]);

// Run the dropDatabase op on a database with an existing collection so that we can exercise
// dropDatabase cleanly awaiting replication of the collection drop internally.
assert.commandWorked(
    primaryDB.adminCommand({applyOps: [{op: "c", ns: cmdNss, o: {dropDatabase: 1}}]}));

assert.eq(rst.getPrimary().getDBNames().indexOf(dbName), -1);

rst.stopSet();
})();