$ mkdir d
	$ cd d

	$ echo a > a
	$ quilt new test.diff
	> Patch patches/test.diff is now on top

	$ quilt add a
	> File a added to patch patches/test.diff

	$ echo "a " > a
	$ quilt refresh
	> Warning: patches/test.diff adds trailing whitespace
	> Refreshed patch patches/test.diff

	$ grep '[ \t]$' patches/test.diff
	> +a 

	$ quilt refresh --strip-trailing-whitespace
	> Refreshed patch patches/test.diff

	$ grep '[ \t]$' patches/test.diff

	$ cd ..
	$ rm -rf d