[PATCH 15/16] Revert and amend "test-lib-functions: assert correct parameter count"

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

This reverts and amends my my own e7884b353b7 (test-lib-functions:
assert correct parameter count, 2021-02-12) in order to improve the -x
output.

When I added these BUG assertions in e7884b353b7 I missed that this
made the -x output much more verbose.

E.g. for each test_cmp invocation we'd now emit:

    + test_cmp expect actual
    + test 2 -ne 2
    + eval diff -u "$@"
    + diff -u expect actual

That "test 2 -ne 2" line is new in e7884b353b7. As noted in
45a2686441b (test-lib-functions: remove bug-inducing "diagnostics"
helper param, 2021-02-12) we had buggy invocations of some of these
functions with too many parameters.

Let's instead use "$@" instead of "$1" to achieve the same ends with
no extra -x output verbosity. The "test" operator will die with an
error if given more than one argument in these contexts, so using "$@"
achieves the same goal.

The same goes for "cmp" and "diff -u" (which we typically use for
test_cmp).

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 t/test-lib-functions.sh | 41 ++++++++++++++++-------------------------
 1 file changed, 16 insertions(+), 25 deletions(-)

diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index c46bf0ff09c..2cf72b56851 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -759,39 +759,35 @@ test_external_without_stderr () {
 # debugging-friendly alternatives to "test [-f|-d|-e]"
 # The commands test the existence or non-existence of $1
 test_path_is_file () {
-	test "$#" -ne 1 && BUG "1 param"
-	if ! test -f "$1"
+	if ! test -f "$@"
 	then
-		echo "File $1 doesn't exist"
+		echo "File $@ doesn't exist"
 		return 1
 	fi
 }
 
 test_path_is_dir () {
-	test "$#" -ne 1 && BUG "1 param"
-	if ! test -d "$1"
+	if ! test -d "$@"
 	then
-		echo "Directory $1 doesn't exist"
+		echo "Directory $@ doesn't exist"
 		return 1
 	fi
 }
 
 test_path_exists () {
-	test "$#" -ne 1 && BUG "1 param"
-	if ! test -e "$1"
+	if ! test -e "$@"
 	then
-		echo "Path $1 doesn't exist"
+		echo "Path $@ doesn't exist"
 		return 1
 	fi
 }
 
 # Check if the directory exists and is empty as expected, barf otherwise.
 test_dir_is_empty () {
-	test "$#" -ne 1 && BUG "1 param"
-	test_path_is_dir "$1" &&
-	if test -n "$(ls -a1 "$1" | egrep -v '^\.\.?$')"
+	test_path_is_dir "$@" &&
+	if test -n "$(ls -a1 "$@" | egrep -v '^\.\.?$')"
 	then
-		echo "Directory '$1' is not empty, it contains:"
+		echo "Directory '$@' is not empty, it contains:"
 		ls -la "$1"
 		return 1
 	fi
@@ -799,17 +795,15 @@ test_dir_is_empty () {
 
 # Check if the file exists and has a size greater than zero
 test_file_not_empty () {
-	test "$#" = 2 && BUG "2 param"
-	if ! test -s "$1"
+	if ! test -s "$@"
 	then
-		echo "'$1' is not a non-empty file."
+		echo "'$@' is not a non-empty file."
 		return 1
 	fi
 }
 
 test_path_is_missing () {
-	test "$#" -ne 1 && BUG "1 param"
-	if test -e "$1"
+	if test -e "$@"
 	then
 		echo "Path $1 exists!"
 		false
@@ -1013,7 +1007,6 @@ test_expect_code () {
 # - not all diff versions understand "-u"
 
 test_cmp () {
-	test "$#" -ne 2 && BUG "2 param"
 	eval "$GIT_TEST_CMP" '"$@"'
 }
 
@@ -1043,7 +1036,6 @@ test_cmp_config () {
 # test_cmp_bin - helper to compare binary files
 
 test_cmp_bin () {
-	test "$#" -ne 2 && BUG "2 param"
 	cmp "$@"
 }
 
@@ -1104,12 +1096,11 @@ verbose () {
 # otherwise.
 
 test_must_be_empty () {
-	test "$#" -ne 1 && BUG "1 param"
-	test_path_is_file "$1" &&
-	if test -s "$1"
+	test_path_is_file "$@" &&
+	if test -s "$@"
 	then
-		echo "'$1' is not empty, it contains:"
-		cat "$1"
+		echo "'$@' is not empty, it contains:"
+		cat "$@"
 		return 1
 	fi
 }
-- 
2.31.1.634.gb41287a30b0