How do I run setup and tear-down code once for all my tests?

Wrap the top level test suite in a subclass of TestSetup.

The following is a sample AllTests.suite() method:

public static Test suite() { 

    TestSuite suite = new TestSuite(); 
        
    // Add your tests to the suite here

    TestSetup wrapper = new TestSetup(suite) { 

        public void setUp() { 
            oneTimeSetUp(); 
        }

        public void tearDown() { 
            oneTimeTearDown(); 
        }
    }; 

    return wrapper; 
 }