TestDriven.NET hangs for tests that connect to the database

So I'm writing a web service that connects to a remote PostgreSQL server, pulls some data and then I do stuff with the data. Currently, I'm writing unit tests to ensure that I can grab the data and my List<T> has a count greater than zero.

I have a private PostgresSQL connection:

private NpgsqlConnection _conn;

In the test fixture setup, I open the connection:

[TestFixtureSetUp]
public void TestFixtureSetUp()
{
    _conn = DAL.ConnectToPostgeSQL();
}

Write some tests...example:

[Test]
public void CanGetSubmissions()
{
    List<Submission> submission = DAL.GetSubmissions(_conn);
    Assert.GreaterThan(submission.Count, 0);
}

Then, I tear down to close out the connections:

[TestFixtureTearDown]
public void TestFixtureTearDown()
{
    _conn.Close();
    _conn.Dispose();
}

The trouble is that after the test(s) (can occur if I only run one test), it passes and then just hangs until I stop TestDriven.NET.

Any thoughts on this? I'm thinking that it has to do开发者_如何学Python with the PostgreSQL connection, because when I remove those, the tests will fail and everything tears down as it should.

Open and close connection for each test - Setup & TearDown instead of TestFixtureSetup & TestFixtureTeardown