Skip tox 3/4 tests with tox 4/3 via pytest, not tox

tests/test_integration_tox3.py

@@ -13,6 +13,7 @@ from utils import (
     NATIVE_EXECUTABLE,
     NATIVE_SITE_PACKAGES,
     NATIVE_TOXENV,
+    TOX_VERSION,
     envs_from_tox_ini,
     is_available,
     modify_config,
@@ -22,6 +23,10 @@ from utils import (
 )
 
 
+if TOX_VERSION.major != 3:
+    pytest.skip("skipping tests for tox 3", allow_module_level=True)
+
+
 def test_native_toxenv_current_env():
     result = tox("-e", NATIVE_TOXENV, "--current-env")
     assert result.stdout.splitlines()[0] == NATIVE_EXEC_PREFIX_MSG

tests/test_integration_tox4.py

@@ -10,6 +10,7 @@ from utils import (
     NATIVE_EXEC_PREFIX_MSG,
     NATIVE_SITE_PACKAGES,
     NATIVE_TOXENV,
+    TOX_VERSION,
     TOX_MIN_VERSION,
     envs_from_tox_ini,
     modify_config,
@@ -20,6 +21,10 @@ from utils import (
 )
 
 
+if TOX_VERSION.major != 4:
+    pytest.skip("skipping tests for tox 4", allow_module_level=True)
+
+
 def test_native_toxenv_current_env():
     result = tox("-e", NATIVE_TOXENV, "--current-env")
     assert result.stdout.splitlines()[0] == NATIVE_EXEC_PREFIX_MSG

tox.ini

@@ -12,8 +12,7 @@ deps=
     tox3: tox < 4
     tox4: tox >=4,< 5
 commands =
-    !tox4: pytest -v {posargs} tests/test_integration.py
+    pytest -v {posargs} tests
-    tox4: pytest -v {posargs} tests/test_integration_tox4.py
 
 [pytest]
 addopts = -nauto