Re: [PATCH next] test-lib: set $DIFF to diff if it is unset

> Since 7b3bdbb (fixup: do not unconditionally disable "diff -u",
> 2010-05-31), test-lib.sh depends on having $DIFF set in the
> environment for the construction of $GIT_TEST_CMP.  While this works
> when called from the main Makefile, it fails if the tests are called
> on their own and the user does not have $DIFF set.
> 
> Set it to 'diff' if it is unset, like the Makefile does.
> 
> Signed-off-by: Thomas Rast <trast@student.ethz.ch>
> ---
> 
> I have an uneasy feeling that I must be missing something, seeing as
> this went unnoticed for 10 days...
> 
>  t/test-lib.sh |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/t/test-lib.sh b/t/test-lib.sh
> index b23a61d..4d89049 100644
> --- a/t/test-lib.sh
> +++ b/t/test-lib.sh
> @@ -78,6 +78,7 @@ export EDITOR
>  
>  if test -z "$GIT_TEST_CMP"
>  then
> +	DIFF=${DIFF:-diff}
>  	if test -n "$GIT_TEST_CMP_USE_COPIED_CONTEXT"
>  	then
>  		GIT_TEST_CMP="$DIFF -c"