test_guest_tools_unix: use a fixture instead of expecting test_install

Same as for test_basic_without_ssh, and this allows to stop using
@pytest.mark.incremental here too.

Signed-off-by: Yann Dirson <[email protected]>

Author: ydirson

tests/guest-tools/unix/test_guest_tools_unix.py

@@ -16,7 +16,6 @@ def __init__(self):
         self.tools_version = None
         self.vm_distro = None
 
-@pytest.mark.incremental # tests depend on each other. If one test fails, don't execute the others
 @pytest.mark.multi_vms
 @pytest.mark.usefixtures("unix_vm")
 class TestGuestToolsUnix:
@@ -34,7 +33,8 @@ def _check_os_info(self, vm, vm_distro):
         detected_distro = vm.distro()
         assert detected_distro == vm_distro
 
-    def test_install(self, running_vm, state):
+    @pytest.fixture(scope="class", autouse=True)
+    def vm_install(self, running_vm, state):
         vm = running_vm
 
         # skip test for some unixes