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var res;
t = db.jstests_uniqueness;
t.drop();
// test uniqueness of _id
res = t.save( { _id : 3 } );
assert.writeOK( res );
// this should yield an error
res = t.insert( { _id : 3 } );
assert.writeError( res );
assert.eq( 1, t.count() );
res = t.insert( { _id : 4, x : 99 } );
assert.writeOK( res );
// this should yield an error
res = t.update( { _id : 4 } , { _id : 3, x : 99 } );
assert.writeError( res );
assert( t.findOne( {_id:4} ) );
// Check for an error message when we index and there are dups
db.jstests_uniqueness2.drop();
db.jstests_uniqueness2.insert({a:3});
db.jstests_uniqueness2.insert({a:3});
assert.eq( 2, db.jstests_uniqueness2.count() );
res = db.jstests_uniqueness2.ensureIndex({a:1}, true);
assert.commandFailed( res );
assert( res.errmsg.match( /E11000/ ) );
// Check for an error message when we index in the background and there are dups
db.jstests_uniqueness2.drop();
db.jstests_uniqueness2.insert({a:3});
db.jstests_uniqueness2.insert({a:3});
assert.eq( 2, db.jstests_uniqueness2.count() );
res = db.jstests_uniqueness2.ensureIndex({a:1}, {unique:true,background:true});
assert.commandFailed( res );
assert( res.errmsg.match( /E11000/ ) );
/* Check that if we update and remove _id, it gets added back by the DB */
/* - test when object grows */
t.drop();
t.save( { _id : 'Z' } );
t.update( {}, { k : 2 } );
assert.eq( 'Z', t.findOne()._id, "uniqueness.js problem with adding back _id" );
/* - test when doesn't grow */
t.drop();
t.save( { _id : 'Z', k : 3 } );
t.update( {}, { k : 2 } );
assert.eq( 'Z', t.findOne()._id, "uniqueness.js problem with adding back _id (2)" );
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