(function() {
'use strict';

var s = new ShardingTest({shards: 2, mongos: 2});
var specialDB = "[a-z]+";
var specialNS = specialDB + ".special";

assert.commandWorked(s.s0.adminCommand({enablesharding: "test"}));
s.ensurePrimaryShard('test', s.shard1.shardName);
assert.commandWorked(s.s0.adminCommand({shardcollection: "test.data", key: {num: 1}}));

// Test that the database will not complain "cannot have 2 database names that differs on case"
assert.commandWorked(s.s0.adminCommand({enablesharding: specialDB}));
s.ensurePrimaryShard(specialDB, s.shard0.shardName);
assert.commandWorked(s.s0.adminCommand({shardcollection: specialNS, key: {num: 1}}));

var exists = s.getDB("config").collections.find({_id: specialNS}).itcount();
assert.eq(exists, 1);

// Test that drop database properly cleans up config
s.getDB(specialDB).dropDatabase();

// TODO (SERVER-51881): Remove this check after 5.0 is released
var droppedColl = s.getDB("config").collections.find({_id: specialNS}).toArray();
if (droppedColl.length > 0) {
    assert.eq(1, droppedColl.length);
    assert.eq(true, droppedColl.dropped);
}

s.stop();
})();