test-lib: disable trace when test is not verbose

The "-x" test-script option turns on the shell's "-x"
tracing, which can help show why a particular test is
failing. Unfortunately, this can create false negatives in
some tests if they invoke a shell function with its stderr
redirected. t5512.10 is such a test, as it does:

    test_must_fail git ls-remote refs*master >actual 2>&1 &&
    test_cmp exp actual

The "actual" file gets the "-x" trace for the test_must_fail
function, which prevents it from matching the expected
output.

There's no way to avoid this without managing the
trace flag inside each sub-function, which isn't really a
workable solution. But unless you specifically care about
t5512.10, we can work around it by enabling tracing only for
the specific tests we want.

You can already do:

    ./t5512-ls-remote.sh -x --verbose-only=16

to see the trace only for a specific test. But that doesn't
_disable_ the tracing in the other tests; it just sends it
to /dev/null. However, there's no point in generating a
trace that the user won't see, so we can simply disable
tracing whenever it doesn't have a matching verbose flag.

The normal case of just "./t5512-ls-remote.sh -x" stays the
same, as "-x" already implies "--verbose" (and
"--verbose-only" overrides "--verbose", which is why this
works at all). And for our test, we need only check
$verbose, as maybe_setup_verbose will have already
set that flag based on the $verbose_only list).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/test-lib.sh

@@ -492,6 +492,10 @@ maybe_setup_valgrind () {
 	fi
 }
 
+want_trace () {
+	test "$trace" = t && test "$verbose" = t
+}
+
 # This is a separate function because some tests use
 # "return" to end a test_expect_success block early
 # (and we want to make sure we run any cleanup like
@@ -499,7 +503,7 @@ maybe_setup_valgrind () {
 test_eval_inner_ () {
 	# Do not add anything extra (including LF) after '$*'
 	eval "
-		test \"$trace\" = t && set -x
+		want_trace && set -x
 		$*"
 }
 
@@ -515,7 +519,7 @@ test_eval_ () {
 	{
 		test_eval_inner_ "$@" </dev/null >&3 2>&4
 		test_eval_ret_=$?
-		if test "$trace" = t
+		if want_trace
 		then
 			set +x
 			if test "$test_eval_ret_" != 0