Re: [PATCH 1/2] t5318: use 'test_must_be_empty'

[Taylor Blau <me@ttaylorr.com>]

On Tue, Jun 02, 2020 at 08:04:03PM +0200, SZEDER Gábor wrote:
> On Mon, Jun 01, 2020 at 12:01:27PM -0600, Taylor Blau wrote:
> > A handful of tests in t5318 use 'test_line_count = 0 ...' to make sure
> > that some command does not write any output. While correct, it is more
> > helpful to use 'test_must_be_empty' instead, since the latter prints the
> > contents of the file if it is non-empty.
> >
> > Since 'test_line_count' only prints the expected and actual line count,
> > not the contents, using 'test_must_be_empty' may be more helpful for
> > debugging if there is regression in any of these tests.
>
> These two paragraphs essentially say the same thing, so I think only
> one would be sufficient, but...  Both paragraphs are wrong, because
> 'test_line_count' does include the content of the file on failure:
>
>   expecting success of 9999.1 'test':
>           cat >foo <<-EOF &&
>           Add
>           some
>           content
>           EOF
>           test_line_count = 0 foo
>
>   test_line_count: line count for foo != 0
>   Add
>   some
>   content
>   not ok 1 - test
>
> Having said that, I think that the change itself is good, because
> 'test_must_be_empty foo' is more idiomatic.

Sounds good. Let's use this version of the patch instead, and otherwise
I think this should be ready to go:

--- >8 ---

Subject: [PATCH] t5318: use 'test_must_be_empty'

A handful of tests in t5318 use 'test_line_count = 0 ...' to make sure
that some command does not write any output. While correct, it is more
idiomatic to use 'test_must_be_empty' instead. Switch the former
invocations to use the latter instead.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
---
 t/t5318-commit-graph.sh | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
index a79c624875..d23986f603 100755
--- a/t/t5318-commit-graph.sh
+++ b/t/t5318-commit-graph.sh
@@ -147,7 +147,7 @@ test_expect_success 'Add more commits' '
 test_expect_success 'commit-graph write progress off for redirected stderr' '
 	cd "$TRASH_DIRECTORY/full" &&
 	git commit-graph write 2>err &&
-	test_line_count = 0 err
+	test_must_be_empty err
 '

 test_expect_success 'commit-graph write force progress on for stderr' '
@@ -159,13 +159,13 @@ test_expect_success 'commit-graph write force progress on for stderr' '
 test_expect_success 'commit-graph write with the --no-progress option' '
 	cd "$TRASH_DIRECTORY/full" &&
 	git commit-graph write --no-progress 2>err &&
-	test_line_count = 0 err
+	test_must_be_empty err
 '

 test_expect_success 'commit-graph verify progress off for redirected stderr' '
 	cd "$TRASH_DIRECTORY/full" &&
 	git commit-graph verify 2>err &&
-	test_line_count = 0 err
+	test_must_be_empty err
 '

 test_expect_success 'commit-graph verify force progress on for stderr' '
@@ -177,7 +177,7 @@ test_expect_success 'commit-graph verify force progress on for stderr' '
 test_expect_success 'commit-graph verify with the --no-progress option' '
 	cd "$TRASH_DIRECTORY/full" &&
 	git commit-graph verify --no-progress 2>err &&
-	test_line_count = 0 err
+	test_must_be_empty err
 '

 # Current graph structure:
--
2.27.0