Take copied modulemd_defaults into consideration for module errata copy

re: #5055
https://pulp.plan.io/issues/5055

.gitignore

@@ -10,3 +10,4 @@ __pycache__/
 /build/
 /dist/
 /pulp_2_tests.egg-info/
+.idea/

pulp_2_tests/constants.py

@@ -149,7 +149,8 @@
         'errata_id': 'RHEA-2012:0059',
         'modules_count': 2,
         'rpm_count': 2,
-        'total_available_units': 5,
+        'module_defaults_count': 2,
+        'total_available_units': 7,
     }
 )
 """The information about a Modular Errata with RPM artifacts.

pulp_2_tests/tests/rpm/api_v2/test_modularity.py

@@ -1441,6 +1441,7 @@ class ModularErrataCopyTestCase(unittest.TestCase):
     Recursive copy of ``RHEA-2012:0059`` should copy:
 
     * 2 modules: ``duck`` and ``kangaroo``.
+    * 2 modulemd_defaults ``duck`` and ``kangaroo``.
     * 2 RPMS: ``kangaroo-0.3-1.noarch.rpm``, and ``duck-0.7-1.noarch.rpm``.
 
     Exercise the use of ``recursive`` and ``recursive_conservative``.
@@ -1450,8 +1451,8 @@ class ModularErrataCopyTestCase(unittest.TestCase):
     def setUpClass(cls):
         """Create class-wide variables."""
         cls.cfg = config.get_config()
-        if cls.cfg.pulp_version < Version('2.19'):
-            raise unittest.SkipTest('This test requires Pulp 2.19 or newer.')
+        if cls.cfg.pulp_version < Version('2.21'):
+            raise unittest.SkipTest('This test requires Pulp 2.21 or newer.')
         cls.client = api.Client(cls.cfg, api.json_handler)
 
     def test_recursive_noconservative_nodependency(self):
@@ -1502,6 +1503,12 @@ def make_assertions_dependency(self, repo):
             repo['content_unit_counts']
         )
 
+        self.assertEqual(
+            repo['content_unit_counts']['modulemd_defaults'],
+            MODULE_FIXTURES_ERRATA['module_defaults_count'],
+            repo['content_unit_counts']
+        )
+
         # older RPM package already present has to be added to total of RPM
         # packages after copy.
         self.assertEqual(
@@ -1524,6 +1531,12 @@ def make_assertions_nodependency(self, repo):
             repo['content_unit_counts']
         )
 
+        self.assertEqual(
+            repo['content_unit_counts']['modulemd_defaults'],
+            MODULE_FIXTURES_ERRATA['module_defaults_count'],
+            repo['content_unit_counts']
+        )
+
         self.assertEqual(
             repo['total_repository_units'],
             MODULE_FIXTURES_ERRATA['total_available_units'],