Tests.statistics: Change dense sparse decorator to check sparse with no explicit zeros

Author: pavlin-policar

Orange/tests/test_statistics.py

@@ -26,7 +26,9 @@ def sparse_with_explicit_zero(x, array):
 
             return sp_array
 
-        test_case(self, lambda x: np.array(x))
+        test_case(self, np.array)
+        test_case(self, csr_matrix)
+        test_case(self, csc_matrix)
         test_case(self, partial(sparse_with_explicit_zero, array=csr_matrix))
         test_case(self, partial(sparse_with_explicit_zero, array=csc_matrix))