Extructure of UnitTest

Hi,

Are any of you in this forum that know how to structure UnitTest, testsuite and setup/tearDown in the correct way?

If I create the following structure:

allTest.py
def suite():
  return unittest.TestSuite([
                              unittest.TestLoader().loadTestsFromTestCase(A_test.ATestCase)
                            , unittest.TestLoader().loadTestsFromTestCase(B_test.BTestCase)
                            , unittest.TestLoader().loadTestsFromTestCase(C_test.CTestCase)
                            ])
if __name__ == '__main__':
  unittest.TextTestRunner().run(suite())

A_test.py
class ATestCase(TestInit):
        def test_build_uri_abs(self):

        def test_build_uri_rel(self):

        def test_build_uri_rel_slashless(self):

B_test.py
classBTestCase(TestInit):
        def test_build_uri_abs(self):

        def test_build_uri_rel(self):

        def test_build_uri_rel_slashless(self):

C_test.py
class CTestCase(TestInit):
        def test_build_uri_abs(self):

        def test_build_uri_rel(self):

        def test_build_uri_rel_slashless(self):

Init.py
class TestInit(unittest.TestCase):

    def setUp(self):
        global ffApp
        ffLoc = r'C:\Program\Mozilla Firefox\firefox.exe'
        ffTitle = "Mozilla Firefox"
        ffApp = App(ffTitle) # app object "containing" all FF windows
        if not ffApp.window():
            print("open firefox..")
            App(ffLoc).focus() # opens FF
            wait(4)
        ffApp.focus()
        print("type zaci url..")
        type('l', KEY_CTRL)
        paste('https://localhost/index.php')
        type(Key.ENTER)
        wait("1381231580670.png", 20)
        with Region(find("1381231618344.png")):
            doubleClick("1381231634958.png")
            type("hudson")
            wait(2)
            doubleClick("1381231649319.png")
            type("hudson1")
            wait(2)
            click("1381231658482.png")
        wait("1381231705529.png", 10)

    def tearDown(self):
        print("Close Firefox")
        click("Loggaut.png")
        wait(2)
        ffApp.close()
        wait(5)

Any comment and feedback will appreciated.

//RB