Re: [PATCH v3 2/3] diff-highlight: add failing test for handling --graph output.

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Brian Henderson <henderson.bj@xxxxxxxxx> writes:

> Signed-off-by: Brian Henderson <henderson.bj@xxxxxxxxx>
> ---
>  contrib/diff-highlight/t/t9400-diff-highlight.sh | 54 ++++++++++++++++++++++++
>  1 file changed, 54 insertions(+)
>
> diff --git a/contrib/diff-highlight/t/t9400-diff-highlight.sh b/contrib/diff-highlight/t/t9400-diff-highlight.sh
> index 6b8a461..3b3c831 100755
> --- a/contrib/diff-highlight/t/t9400-diff-highlight.sh
> +++ b/contrib/diff-highlight/t/t9400-diff-highlight.sh
> @@ -85,10 +85,50 @@ dh_commit_test () {
>  	test_cmp commit.exp commit.act
>  }
>  
> +# dh_test_setup_history takes a series (3) of changes and generates a contrived graph
> +# of commits and merges

The first line look a bit overlong.

If the graph is truly "contrived" as the comment at the beginning
says (I haven't formed an opinion), it probably is a good idea to
draw a picture upfront.

> +dh_test_setup_history () {
> +	a="$1" b="$2" c="$3"

Even though assignment would not fail, it probably is a good idea to
&&-chain this line, too, for consistency.  I.e.

	a=$1 b=$2 c=$3 &&

Note that RHS of an assignment do not need dq; it does not hurt to
quote them, though.

> +	printf "$a" >file &&
> +	git add file &&
> +	git commit -m"Add a file" &&

Avoid sticking a short-option to its argument, i.e.

    git commit -m "Add a file"

> +	printf "$b" >file &&
> +	git commit -am"Update a file" &&

Likewise.

    git commit -a -m "Update a file".

> +left_trim () {
> +	"$PERL_PATH" -pe 's/^\s+//'
> +}
> +
> +trim_graph_el () {

What does "el" stand for?  Not E-lisp ;-)

If you meant "elements" or something, probably that is unnecessary
and "trim_graph" would be sufficient, but you may have meant
something else.

> +	# graphs start with * or |
> +	# followed by a space or / or \
> +	"$PERL_PATH" -pe 's@^((\*|\|)( |/|\\))+@@'
> +}
> +
>  test_expect_success 'diff-highlight highlights the beginning of a line' '
>  	dh_test \
>  		"aaa\nbbb\nccc\n" \
> @@ -145,6 +185,20 @@ test_expect_failure 'diff-highlight highlights mismatched hunk size' '
>  
>  # TODO add multi-byte test
>  
> +test_expect_failure 'diff-highlight works with the --graph option' '
> +	dh_test_setup_history \
> +		"aaa\nbbb\nccc\n" \
> +		"aaa\n0bb\nccc\n" \
> +		"aaa\nb0b\nccc\n" &&
> +
> +	# topo-order so that the order of the commits is the same as with --graph
> +	# trim graph elements so we can do a diff
> +	# trim leading space because our trim_graph_el is not perfect
> +	git log -p --topo-order | "$DIFF_HIGHLIGHT" | left_trim >graph.exp &&
> +	git log -p --graph | "$DIFF_HIGHLIGHT" | trim_graph_el | left_trim >graph.act &&
> +	test_cmp graph.exp graph.act
> +'
> +
>  test_done
>  
>  # vim: set noet
--
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