Correct cannot collect test class warnings

Signed-off-by: Gábor Lipták <gliptak@gmail.com>

Author: gliptak

dataprofiler/tests/profilers/test_histogram_utils.py

@@ -33,6 +33,8 @@ def mock_sqrt_return_nan(profile):
 
 
 class TestColumn(NumericStatsMixin):
+    __test__ = False
+
     def __init__(self):
         NumericStatsMixin.__init__(self)
         self.times = defaultdict(float)

dataprofiler/tests/profilers/test_numeric_stats_mixin_profile.py

@@ -19,6 +19,8 @@
 
 
 class TestColumn(NumericStatsMixin):
+    __test__ = False
+
     def __init__(self):
         NumericStatsMixin.__init__(self)
         self.match_count = 0
@@ -32,6 +34,7 @@ def _filter_properties_w_options(self, calculations, options):
 
 
 class TestColumnWProps(TestColumn):
+    __test__ = False
     # overrides the property func
     median = None
     mode = None