How can i setup the testlayers correctly?

Plone Support Add-on Development
,
1

in the __init__.py of my.addon i set hard a breakpoint(). for me it means "wait if the addon is loaded/installed". this was the plan.

Now my Question. If i run zope-testrunner -pvcx --test-path=src -t TestCase1 or zope-testrunner -pvcx --test-path=src -t TestCase2 all is fine. The breakpoint bring me in the debugger console.

But if i run zope-testrunner -pvcx --test-path=src -t TestCase, it should be run TestCase1 and then TestCase2 Cases together, then surprise, My expectations were not met. the debugger come only once, not twice.

I think, it has to be with the zope.startup and the construction of the dummy zopedb. But i don't know. Can anyone help me to setup the layers correctly. Background, i would like load a configuration at startup in the package. but the tests fails, because i can't do this twice in different layers.

that is my simple testsetup

class Layer1(PloneSandboxLayer):
    defaultBases = (PLONE_FIXTURE,)

    def setUpZope(self, app, configurationContext):
        self.loadZCML(package=my.addon)

    def setUpPloneSite(self, portal):
        applyProfile(portal, "my.addon:default")


FIXTURE1 = Layer1()

INTEGRATION_TESTING1 = IntegrationTesting(
    bases=(FIXTURE1,),
    name="MY.ADDON:IntegrationTesting1",
)

class Layer2(PloneSandboxLayer):
    defaultBases = (PLONE_FIXTURE,)

    def setUpZope(self, app, configurationContext):
        self.loadZCML(package=my.addon)

    def setUpPloneSite(self, portal):
        applyProfile(portal, "my.addon:default")

FIXTURE2 = Layer2()

INTEGRATION_TESTING2 = IntegrationTesting(
    bases=(FIXTURE2,),
    name="MY.ADDON:IntegrationTesting2",
)

from my.addon.testing import INTEGRATION_TESTING1
from my.addon.testing import INTEGRATION_TESTING2

import unittest


class TestCase1(unittest.TestCase):

    layer = INTEGRATION_TESTING1

    def test_config(self):

        pass


class TestCase2(unittest.TestCase):

    layer = INTEGRATION_TESTING2

    def test_config(self):

        pass

Does anyone have any advice for me?