Added more text alignment unit tests

Author: kmvanbrunt

cmd2/utils.py

@@ -737,6 +737,8 @@ def ljustify_text(text: str, *, fill_char: str = ' ', width: Optional[int] = Non
     :param tab_width: any tabs in the text will be replaced with this many spaces. if fill_char is a tab, then it will
                       be converted to a space.
     :return: left-justified text
+    :raises: TypeError if fill_char is more than one character
+             ValueError if text or fill_char contains an unprintable character
     """
     return align_text(text, fill_char=fill_char, width=width,
                       tab_width=tab_width, alignment=TextAlignment.LEFT)
@@ -754,6 +756,8 @@ def center_text(text: str, *, fill_char: str = ' ', width: Optional[int] = None,
     :param tab_width: any tabs in the text will be replaced with this many spaces. if fill_char is a tab, then it will
                       be converted to a space.
     :return: centered text
+    :raises: TypeError if fill_char is more than one character
+             ValueError if text or fill_char contains an unprintable character
     """
     return align_text(text, fill_char=fill_char, width=width,
                       tab_width=tab_width, alignment=TextAlignment.CENTER)
@@ -771,6 +775,8 @@ def rjustify_text(text: str, *, fill_char: str = ' ', width: Optional[int] = Non
     :param tab_width: any tabs in the text will be replaced with this many spaces. if fill_char is a tab, then it will
                       be converted to a space.
     :return: right-justified text
+    :raises: TypeError if fill_char is more than one character
+             ValueError if text or fill_char contains an unprintable character
     """
     return align_text(text, fill_char=fill_char, width=width,
                       tab_width=tab_width, alignment=TextAlignment.RIGHT)

tests/test_utils.py

@@ -326,7 +326,7 @@ def test_align_text_blank():
     fill_char = '-'
     width = 5
     aligned = cu.align_text(text, fill_char=fill_char, width=width, alignment=cu.TextAlignment.LEFT)
-    assert aligned == text + fill_char * width
+    assert aligned == fill_char * width
 
 def test_align_text_wider_than_width():
     text = 'long'
@@ -335,6 +335,13 @@ def test_align_text_wider_than_width():
     aligned = cu.align_text(text, fill_char=fill_char, width=width, alignment=cu.TextAlignment.LEFT)
     assert aligned == text
 
+def test_align_text_has_unprintable():
+    text = 'foo\x02'
+    fill_char = '-'
+    width = 5
+    with pytest.raises(ValueError):
+        cu.align_text(text, fill_char=fill_char, width=width, alignment=cu.TextAlignment.LEFT)
+
 def test_align_text_term_width():
     import shutil
     from cmd2 import ansi