// to run: 
//   ./mongo jstests/<this-file>

contains = function(arr,obj) {
    var i = arr.length;
    while (i--) {
        if (arr[i] === obj) {
            return true;
        }
    }
    return false;
}

var resp = db.adminCommand({getLog:"*"})
assert( resp.ok == 1, "error executing getLog command" );
assert( resp.names, "no names field" );
assert( resp.names.length > 0, "names array is empty" );
assert( contains(resp.names,"global") , "missing global category" );
assert( !contains(resp.names,"butty") , "missing butty category" );

resp = db.adminCommand({getLog:"global"})
assert( resp.ok == 1, "error executing getLog command" );
assert( resp.log, "no log field" );
assert( resp.log.length > 0 , "no log lines" );

// getLog value must be a string
assert.commandFailed(db.adminCommand({ getLog: 21 }));