Highlight trailing whitespace

tests/file_test.py

@@ -7,23 +7,8 @@ from babi.file import get_lines
 
 
 def test_position_repr():
-    ret = repr(File('f.txt'))
-    assert ret == (
-        'File(\n'
-        "    filename='f.txt',\n"
-        '    modified=False,\n'
-        '    lines=[],\n'
-        "    nl='\\n',\n"
-        '    file_y=0,\n'
-        '    y=0,\n'
-        '    x=0,\n'
-        '    x_hint=0,\n'
-        '    sha256=None,\n'
-        '    undo_stack=[],\n'
-        '    redo_stack=[],\n'
-        '    select_start=None,\n'
-        ')'
-    )
+    ret = repr(File('f.txt', ()))
+    assert ret == "<File 'f.txt'>"
 
 
 @pytest.mark.parametrize(