Added more validation to TableCreator

Author: kmvanbrunt

cmd2/table_creator.py

@@ -132,7 +132,11 @@ def __init__(self, cols: Sequence[Column], *, tab_width: int = 4) -> None:
         :param cols: column definitions for this table
         :param tab_width: all tabs will be replaced with this many spaces. If a row's fill_char is a tab,
                           then it will be converted to one space.
+        :raises: ValueError if tab_width is less than 1
         """
+        if tab_width < 1:
+            raise ValueError("Tab width cannot be less than 1")
+
         self.cols = copy.copy(cols)
         self.tab_width = tab_width
 

tests/test_table_creator.py

@@ -259,6 +259,10 @@ def test_tabs():
                           inter_cell='\t', post_line='\t')
     assert row == '  Col  1                Col 2  '
 
+    with pytest.raises(ValueError) as excinfo:
+        TableCreator([column_1, column_2], tab_width=0)
+    assert "Tab width cannot be less than 1" in str(excinfo.value)
+
 
 def test_simple_table_creation():
     column_1 = Column("Col 1", width=16)