ISO9660 selftests: make basic_workflow into a test method

As per the last change, let's move the test into the base class, and
just check if the ISO has been setup for this test to work with, and
if not, skip it.  This removes a lot of the boiler plate code.
Signed-off-by: NCleber Rosa <crosa@redhat.com>

selftests/unit/test_utils_iso9660.py

@@ -58,13 +58,12 @@ class BaseIso9660(unittest.TestCase):
         self.iso = None
         self.tmpdir = tempfile.mkdtemp(prefix="avocado_" + __name__)
 
-    def basic_workflow(self):
+    def test_basic_workflow(self):
         """
         Check the basic Iso9660 workflow
-
-        :warning: Make sure to include this in per-implementation tests
-                  due to ast loader we can't just define a base-class.
         """
+        if self.iso is None:
+            self.skipTest("ISO attribute not setup for this test to work with")
         self.assertEqual(self.iso.read("file"),
                          b"file content\n")
         dst = os.path.join(self.tmpdir, "file")
@@ -111,10 +110,6 @@ class IsoInfo(BaseIso9660):
         super(IsoInfo, self).setUp()
         self.iso = iso9660.Iso9660IsoInfo(self.iso_path)
 
-    def test_basic_workflow(self):
-        """Call the basic workflow"""
-        self.basic_workflow()
-
 
 class IsoRead(BaseIso9660):
 
@@ -128,10 +123,6 @@ class IsoRead(BaseIso9660):
         super(IsoRead, self).setUp()
         self.iso = iso9660.Iso9660IsoRead(self.iso_path)
 
-    def test_basic_workflow(self):
-        """Call the basic workflow"""
-        self.basic_workflow()
-
 
 class IsoMount(BaseIso9660):
 
@@ -145,10 +136,6 @@ class IsoMount(BaseIso9660):
         super(IsoMount, self).setUp()
         self.iso = iso9660.Iso9660Mount(self.iso_path)
 
-    def test_basic_workflow(self):
-        """Call the basic workflow"""
-        self.basic_workflow()
-
 
 class PyCDLib(BaseIso9660):
 
@@ -161,10 +148,6 @@ class PyCDLib(BaseIso9660):
         super(PyCDLib, self).setUp()
         self.iso = iso9660.ISO9660PyCDLib(self.iso_path)
 
-    def test_basic_workflow(self):
-        """Call the basic workflow"""
-        self.basic_workflow()
-
     def test_create_write(self):
         new_iso_path = os.path.join(self.tmpdir, 'new.iso')
         new_iso = iso9660.ISO9660PyCDLib(new_iso_path)