s = new ShardingTest( "movePrimary1" , 2 );

initDB = function( name ){
    var db = s.getDB( name );
    var c = db.foo;
    c.save( { a : 1 } );
    c.save( { a : 2 } );
    c.save( { a : 3 } );
    assert( 3 , c.count() );
    
    return s.getServer( name );
}

from = initDB( "test1" );
to = s.getOther( from );

assert.eq( 3 , from.getDB( "test1" ).foo.count() , "from doesn't have data before move" );
assert.eq( 0 , to.getDB( "test1" ).foo.count() , "to has data before move" );

assert.eq( s.normalize( s.config.databases.findOne( { _id : "test1" } ).primary ) , 
           s.normalize( from.name ) , "not in db correctly to start" );
s.printShardingStatus();
oldShardName = s.config.databases.findOne( {_id: "test1"} ).primary;
s.admin.runCommand( { moveprimary : "test1" , to : to.name } );
s.printShardingStatus();
assert.eq( s.normalize( s.config.databases.findOne( { _id : "test1" } ).primary ),
           s.normalize(  to.name ) , "to in config db didn't change after first move" );

assert.eq( 0 , from.getDB( "test1" ).foo.count() , "from still has data after move" );
assert.eq( 3 , to.getDB( "test1" ).foo.count() , "to doesn't have data after move" );

// move back, now using shard name instead of server address
s.admin.runCommand( { moveprimary : "test1" , to : oldShardName } );
s.printShardingStatus();
assert.eq( s.normalize( s.config.databases.findOne( { _id : "test1" } ).primary ),
           oldShardName , "to in config db didn't change after second move" );

assert.eq( 3 , from.getDB( "test1" ).foo.count() , "from doesn't have data after move back" );
assert.eq( 0 , to.getDB( "test1" ).foo.count() , "to has data after move back" );

s.stop();