patchgit-checkout: Add a test case for relative paths use.

> Signed-off-by: David Symonds <dsymonds@gmail.com>
> ---
>  t/t2008-checkout-subdir.sh |   36 ++++++++++++++++++++++++++++++++++++
>  1 files changed, 36 insertions(+), 0 deletions(-)
>  create mode 100755 t/t2008-checkout-subdir.sh
>
> diff --git a/t/t2008-checkout-subdir.sh b/t/t2008-checkout-subdir.sh
> new file mode 100755
> index 0000000..cb9c9eb
> --- /dev/null
> +++ b/t/t2008-checkout-subdir.sh
> @@ -0,0 +1,36 @@
> +#!/bin/sh
> +#
> +# Copyright (c) 2007 David Symonds
> +
> +test_description='git checkout from subdirectories'
> +
> +. ./test-lib.sh
> +
> +test_expect_success setup '
> +
> +	echo base > file0 &&
> +	git add file0 &&
> +	mkdir dir1 &&
> +	echo hello > dir1/file1 &&
> +	git add dir1/file1 &&
> +	test_tick &&
> +	mkdir dir2 &&
> +	echo bonjour > dir2/file2 &&
> +	git add dir2/file2 &&
> +	git commit -m "populate tree"
> +
> +'
> +
> +test_expect_success 'remove and restore with relative path' '
> +
> +	cd dir1 &&
> +	rm ../file0 &&
> +	git checkout HEAD -- ../file0 && test -f ../file0 &&
> +	rm ../dir2/file2 &&
> +	git checkout HEAD -- ../dir2/file2 && test -f ../dir2/file2 &&
> +	rm ../file0 ./file1 &&
> +	git checkout HEAD -- .. && test -f ../file0 && test -f ./file1
> +
> +'