title: Different test objects pass individually but have error running together. [Does Python nosetests run different test classes in parallel?]
body: <p>I have several test objects that I am connecting to DB in each of their setups. Apparently, my DB connection limits number of accesses per IP, since I am getting this error telling me that a connection is already established when I run all the tests/ folder, but if I run them separately, they all pass. So, I'm wondering if  it is the case that nosetests runs them in parallel? If so, is there a way to disable this feature?</p>