Test: some tests depending on rpm-ostree were not checking its presence

Add conditional skip to some tests that depend on rpm-ostree
availability, but were not checking for its presence. These tests would
previously fail if rpm-ostree is not available. They will be skipped
now.

Signed-off-by: Tomáš Hozza <thozza@redhat.com>

test/mod/test_util_ostree.py

@@ -91,6 +91,7 @@ class TestObjectStore(test.TestBase):
             self.assertEqual(v, js[p])
 
     @unittest.skipUnless(test.TestBase.have_test_data(), "no test-data access")
+    @unittest.skipUnless(test.TestBase.have_rpm_ostree(), "rpm-ostree missing")
     def test_show_commit(self):
         repo_path = os.path.join(self.locate_test_data(), "sources/org.osbuild.ostree/data/repo")
         ostree.show(repo_path, "d6243b0d0ca3dc2aaef2e0eb3e9f1f4836512c2921007f124b285f7c466464d8")

test/run/test_assemblers.py

@@ -98,6 +98,7 @@ def test_rawfs(osbuild, fs_type):
 @pytest.mark.skipif(not test.TestBase.have_tree_diff(), reason="tree-diff missing")
 @pytest.mark.skipif(not test.TestBase.have_test_data(), reason="no test-data access")
 @pytest.mark.skipif(not test.TestBase.can_bind_mount(), reason="root-only")
+@pytest.mark.skipif(not test.TestBase.have_rpm_ostree(), reason="rpm-ostree missing")
 def test_ostree(osbuild):
     with osbuild as osb:
         with open(os.path.join(test.TestBase.locate_test_data(),