Re: [PATCH 1/2] tests: make test_must_fail more verbose

[Jonathan Nieder <jrnieder@gmail.com>]

Jeff King wrote:

> --- a/t/test-lib.sh
> +++ b/t/test-lib.sh
> @@ -591,7 +591,15 @@ test_path_is_missing () {
>  
>  test_must_fail () {
>  	"$@"
> -	test $? -gt 0 -a $? -le 129 -o $? -gt 192
> +	exit_code=$?
> +	if test $exit_code = 0; then
> +		echo >&2 "test_must_fail: command succeeded: $*"
> +		return 1
> +	elif test $exit_code -gt 129 -a $exit_code -le 192; then
> +		echo >&2 "test_must_fail: died by signal: $*"
> +		return 1
> +	fi
> +	return 0
>  }

Can the exit status (e.g. from a shell function) be negative?

Though your patch does not affect this, a command interrupted by a
signal will receive exit status > 192 in shells like ksh93.  Posix
says:

	As explained in other sections, certain exit status values
	have been reserved for special uses and should be used by
	applications only for those purposes:

	126
		A file to be executed was found, but it was not an
		executable utility.
	127
		A utility to be executed was not found.
	>128
		A command was interrupted by a signal.

Unfortunately that does not agree with git usage.

	129
		Incorrect command-line usage, or help requested
		(rather than SIGHUP).
	255
		Failed to create pipe for child process, fork
		failed, execvp failed, wait failed, invalid
		pathspec for add --patch, "git archive" or
		"git daemon" failure (rather than signal 127).

Here's a test_might_fail patch for consistency.

-- 8< --
Subject: tests: make test_might_fail more verbose

Let test_might_fail say something about its failures for consistency
with test_must_fail.

Cc: Jeff King <peff@peff.net>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
 t/test-lib.sh |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/t/test-lib.sh b/t/test-lib.sh
index 285bfd8..506787c 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -615,7 +615,12 @@ test_must_fail () {
 
 test_might_fail () {
 	"$@"
-	test $? -ge 0 -a $? -le 129 -o $? -gt 192
+	exit_code=$?
+	if test $exit_code -gt 129 -a $exit_code -le 192; then
+		echo >&2 "test_might_fail: died by signal: $*"
+		return 1
+	fi
+	return 0
 }
 
 # test_cmp is a helper function to compare actual and expected output.
-- 
1.7.2.2