tests: consolidate the `file_size` function into `test-lib-functions.sh`

In 8de7eeb54b (compression: unify pack.compression configuration
parsing, 2016-11-15), we introduced identical copies of the `file_size`
helper into three test scripts, with the plan to eventually consolidate
them into a single copy.

Let's do that, and adjust the function name to adhere to the `test_*`
naming convention.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Reviewed-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t0021-conversion.sh

@@ -23,10 +23,6 @@ generate_random_characters () {
 		perl -pe "s/./chr((ord($&) % 26) + ord('a'))/sge" >"$TEST_ROOT/$NAME"
 }
 
-file_size () {
-	test-tool path-utils file-size "$1"
-}
-
 filter_git () {
 	rm -f *.log &&
 	git "$@"
@@ -361,9 +357,9 @@ test_expect_success PERL 'required process filter should filter data' '
 		cp "$TEST_ROOT/test3 '\''sq'\'',\$x=.o" "testsubdir/test3 '\''sq'\'',\$x=.r" &&
 		>test4-empty.r &&
 
-		S=$(file_size test.r) &&
+		S=$(test_file_size test.r) &&
-		S2=$(file_size test2.r) &&
+		S2=$(test_file_size test2.r) &&
-		S3=$(file_size "testsubdir/test3 '\''sq'\'',\$x=.r") &&
+		S3=$(test_file_size "testsubdir/test3 '\''sq'\'',\$x=.r") &&
 		M=$(git hash-object test.r) &&
 		M2=$(git hash-object test2.r) &&
 		M3=$(git hash-object "testsubdir/test3 '\''sq'\'',\$x=.r") &&
@@ -432,9 +428,9 @@ test_expect_success PERL 'required process filter should filter data for various
 	(
 		cd repo &&
 
-		S=$(file_size test.r) &&
+		S=$(test_file_size test.r) &&
-		S2=$(file_size test2.r) &&
+		S2=$(test_file_size test2.r) &&
-		S3=$(file_size "testsubdir/test3 '\''sq'\'',\$x=.r") &&
+		S3=$(test_file_size "testsubdir/test3 '\''sq'\'',\$x=.r") &&
 		M=$(git hash-object test.r) &&
 		M2=$(git hash-object test2.r) &&
 		M3=$(git hash-object "testsubdir/test3 '\''sq'\'',\$x=.r") &&
@@ -549,7 +545,7 @@ test_expect_success PERL 'required process filter takes precedence' '
 
 		echo "*.r filter=protocol" >.gitattributes &&
 		cp "$TEST_ROOT/test.o" test.r &&
-		S=$(file_size test.r) &&
+		S=$(test_file_size test.r) &&
 
 		# Check that the process filter is invoked here
 		filter_git add . &&
@@ -573,7 +569,7 @@ test_expect_success PERL 'required process filter should be used only for "clean
 
 		echo "*.r filter=protocol" >.gitattributes &&
 		cp "$TEST_ROOT/test.o" test.r &&
-		S=$(file_size test.r) &&
+		S=$(test_file_size test.r) &&
 
 		filter_git add . &&
 		cat >expected.log <<-EOF &&
@@ -697,9 +693,9 @@ test_expect_success PERL 'process filter should restart after unexpected write f
 		echo "this is going to fail" >smudge-write-fail.o &&
 		cp smudge-write-fail.o smudge-write-fail.r &&
 
-		S=$(file_size test.r) &&
+		S=$(test_file_size test.r) &&
-		S2=$(file_size test2.r) &&
+		S2=$(test_file_size test2.r) &&
-		SF=$(file_size smudge-write-fail.r) &&
+		SF=$(test_file_size smudge-write-fail.r) &&
 		M=$(git hash-object test.r) &&
 		M2=$(git hash-object test2.r) &&
 		MF=$(git hash-object smudge-write-fail.r) &&
@@ -752,9 +748,9 @@ test_expect_success PERL 'process filter should not be restarted if it signals a
 		echo "this will cause an error" >error.o &&
 		cp error.o error.r &&
 
-		S=$(file_size test.r) &&
+		S=$(test_file_size test.r) &&
-		S2=$(file_size test2.r) &&
+		S2=$(test_file_size test2.r) &&
-		SE=$(file_size error.r) &&
+		SE=$(test_file_size error.r) &&
 		M=$(git hash-object test.r) &&
 		M2=$(git hash-object test2.r) &&
 		ME=$(git hash-object error.r) &&
@@ -797,7 +793,7 @@ test_expect_success PERL 'process filter abort stops processing of all further f
 
 		M="blob=$(git hash-object abort.r)" &&
 		rm -f debug.log &&
-		SA=$(file_size abort.r) &&
+		SA=$(test_file_size abort.r) &&
 
 		git add . &&
 		rm -f *.r &&
@@ -859,7 +855,7 @@ test_expect_success PERL 'delayed checkout in process filter' '
 		git commit -m "test commit"
 	) &&
 
-	S=$(file_size "$TEST_ROOT/test.o") &&
+	S=$(test_file_size "$TEST_ROOT/test.o") &&
 	PM="ref=refs/heads/master treeish=$(git -C repo rev-parse --verify master) " &&
 	M="${PM}blob=$(git -C repo rev-parse --verify master:test.a)" &&
 	cat >a.exp <<-EOF &&

t/t1050-large.sh

@@ -5,12 +5,6 @@ test_description='adding and checking out large blobs'
 
 . ./test-lib.sh
 
-# This should be moved to test-lib.sh together with the
-# copy in t0021 after both topics have graduated to 'master'.
-file_size () {
-	test-tool path-utils file-size "$1"
-}
-
 test_expect_success setup '
 	# clone does not allow us to pass core.bigfilethreshold to
 	# new repos, so set core.bigfilethreshold globally
@@ -29,7 +23,7 @@ do
 	test_expect_success "add with $config" '
 		test_when_finished "rm -f .git/objects/pack/pack-*.* .git/index" &&
 		git $config add large1 &&
-		sz=$(file_size .git/objects/pack/pack-*.pack) &&
+		sz=$(test_file_size .git/objects/pack/pack-*.pack) &&
 		case "$expect" in
 		small) test "$sz" -le 100000 ;;
 		large) test "$sz" -ge 100000 ;;

t/t5315-pack-objects-compression.sh

@@ -4,12 +4,6 @@ test_description='pack-object compression configuration'
 
 . ./test-lib.sh
 
-# This should be moved to test-lib.sh together with the
-# copy in t0021 after both topics have graduated to 'master'.
-file_size () {
-	test-tool path-utils file-size "$1"
-}
-
 test_expect_success setup '
 	printf "%2000000s" X |
 	git hash-object -w --stdin >object-name &&
@@ -24,7 +18,7 @@ do
 	test_expect_success "pack-objects with $config" '
 		test_when_finished "rm -f pack-*.*" &&
 		git $config pack-objects pack <object-name &&
-		sz=$(file_size pack-*.pack) &&
+		sz=$(test_file_size pack-*.pack) &&
 		case "$expect" in
 		small) test "$sz" -le 100000 ;;
 		large) test "$sz" -ge 100000 ;;

t/t9303-fast-import-compression.sh

@@ -3,12 +3,6 @@
 test_description='compression setting of fast-import utility'
 . ./test-lib.sh
 
-# This should be moved to test-lib.sh together with the
-# copy in t0021 after both topics have graduated to 'master'.
-file_size () {
-	test-tool path-utils file-size "$1"
-}
-
 import_large () {
 	(
 		echo blob
@@ -24,7 +18,7 @@ do
 		test_when_finished "rm -f .git/objects/pack/pack-*.*" &&
 		test_when_finished "rm -rf .git/objects/??" &&
 		import_large -c fastimport.unpacklimit=0 $config &&
-		sz=$(file_size .git/objects/pack/pack-*.pack) &&
+		sz=$(test_file_size .git/objects/pack/pack-*.pack) &&
 		case "$expect" in
 		small) test "$sz" -le 100000 ;;
 		large) test "$sz" -ge 100000 ;;
@@ -47,7 +41,7 @@ do
 		test_when_finished "rm -f .git/objects/pack/pack-*.*" &&
 		test_when_finished "rm -rf .git/objects/??" &&
 		import_large -c fastimport.unpacklimit=9 $config &&
-		sz=$(file_size .git/objects/??/????*) &&
+		sz=$(test_file_size .git/objects/??/????*) &&
 		case "$expect" in
 		small) test "$sz" -le 100000 ;;
 		large) test "$sz" -ge 100000 ;;

t/test-lib-functions.sh

@@ -783,6 +783,10 @@ test_line_count () {
 	fi
 }
 
+test_file_size () {
+	test-tool path-utils file-size "$1"
+}
+
 # Returns success if a comma separated string of keywords ($1) contains a
 # given keyword ($2).
 # Examples: