Use fixtures instead of finalizers

The teardown order was not correct
and host was not deleted before hostgroup
pytest-dev/pytest#10023 (comment)

tests/foreman/api/test_parameters.py

@@ -14,44 +14,79 @@
 import pytest
 
 
+@pytest.fixture
+def param_name():
+    """Generate name for common parameter"""
+    return gen_string('alpha')
+
+
+@pytest.fixture
+def param_value():
+    """Generate value for common parameter"""
+    return gen_string('alpha')
+
+
+@pytest.fixture
+def cp(param_name, param_value, module_target_sat):
+    """Create common parameter"""
+    cp = module_target_sat.api.CommonParameter(name=param_name, value=param_value).create()
+
+    yield cp
+
+    cp.delete()
+
+
+@pytest.fixture
+def host(param_name, param_value, module_org, module_location, module_target_sat, cp, hostgroup):
+    """Create host"""
+    host = module_target_sat.api.Host(organization=module_org, location=module_location).create()
+
+    yield host
+
+    host.delete()
+
+
+@pytest.fixture
+def hostgroup(param_name, param_value, module_org, module_target_sat):
+    """Create hostgroup"""
+    hg = module_target_sat.api.HostGroup(
+        organization=[module_org],
+        group_parameters_attributes=[{'name': param_name, 'value': param_value}],
+    ).create()
+
+    yield hg
+
+    hg.delete()
+
+
 @pytest.mark.tier1
 @pytest.mark.e2e
 @pytest.mark.upgrade
 def test_positive_parameter_precedence_impact(
-    request, module_org, module_location, module_target_sat
+    request, host, hostgroup, cp, param_name, param_value
 ):
     """Check parameter precedences for Global, Hostgroup, and Host parameters
 
     :id: 8dd6c4e8-4ec9-4bee-8a04-f5788960979b
 
-    :steps:
+    :setup:
         1. Create Global Parameter
         2. Create host and verify global parameter is assigned
         3. Create Host Group with parameter
-        4. Assign hostgroup to host created above and verify hostgroup parameter is assigned.
-        5. Add parameter on the host directly, and verify that this should take precedence
+
+    :steps:
+        1. Assign hostgroup to host created above and verify hostgroup parameter is assigned.
+        2. Add parameter on the host directly, and verify that this should take precedence
             over Host group and Global Parameter
 
     :expectedresults: Host parameter take precedence over hostgroup and global parameter,
         and hostgroup take precedence over global parameter when there are no host parameters
     """
-    param_name = gen_string('alpha')
-    param_value = gen_string('alpha')
-
-    cp = module_target_sat.api.CommonParameter(name=param_name, value=param_value).create()
-    request.addfinalizer(cp.delete)
-    host = module_target_sat.api.Host(organization=module_org, location=module_location).create()
-    request.addfinalizer(host.delete)
     result = [res for res in host.all_parameters if res['name'] == param_name]
     assert result[0]['name'] == param_name
     assert result[0]['associated_type'] == 'global'
 
-    hg = module_target_sat.api.HostGroup(
-        organization=[module_org],
-        group_parameters_attributes=[{'name': param_name, 'value': param_value}],
-    ).create()
-    request.addfinalizer(hg.delete)
-    host.hostgroup = hg
+    host.hostgroup = hostgroup
     host = host.update(['hostgroup'])
     result = [res for res in host.all_parameters if res['name'] == param_name]
     assert result[0]['name'] == param_name