Database.executeBatch(new MyBatch());
Database.executeBatch(new MyBatch());

Database.executeBatch(new MyBatch());
Integer start = System.Now().millisecond();
while(System.Now().millisecond()< start+10){
}

Database.executeBatch(new MyBatch());

MyBatch myBatchObject = new MyBatch();
List<SObject> sObjectList = (List<SObject>)myBatchObject.start(null);
myBatchObject.execute(null, sObjectList);
myBatchObject.finish(null);

myBatchObject = new MyBatch();
sObjectList = (List<SObject>)myBatchObject.start(null);
if(sObjectList.size() > 0 ){
    System.assert( false, 'Size of sObjectList should not be greater than 0' );
}