Implemented code coverage test case for table.split function

tests/test_tables.py

@@ -1996,6 +1996,20 @@ def test_num_columns(table):
     number = table.num_columns
     assert number == 3
 
+def test_split(table):
+    """Test that split copies over the _formats variable from the original table to the new tables correctly after splitting"""
+
+    #defined a custom formatter for points column
+    def positive_point_formatter(value):
+        return f"+{value}"
+
+    table.set_format("points", positive_point_formatter)
+
+    t1, t2 = table.split(2)
+
+    assert t1._formats == table._formats
+    assert t2._formats == table._formats
+
 def test_with_columns(table):
     """Test that with_columns returns self if no labels_and_values passed"""
     t = table.with_columns()