diff --git a/t/t3300-funny-names.sh b/t/t3300-funny-names.sh
index 1f35e55ee3..7480d6e7c2 100755
--- a/t/t3300-funny-names.sh
+++ b/t/t3300-funny-names.sh
@@ -11,6 +11,16 @@ tree, index, and tree objects.
 
 . ./test-lib.sh
 
+HT='	'
+
+echo 2>/dev/null > "Name with an${HT}HT"
+if ! test -f "Name with an${HT}HT"
+then
+	# since FAT/NTFS does not allow tabs in filenames, skip this test
+	skip_all='Your filesystem does not allow tabs in filenames'
+	test_done
+fi
+
 p0='no-funny'
 p1='tabs	," (dq) and spaces'
 p2='just space'
@@ -23,21 +33,9 @@ test_expect_success 'setup' '
 	EOF
 
 	{ cat "$p0" >"$p1" || :; } &&
-	{ echo "Foo Bar Baz" >"$p2" || :; } &&
-
-	if test -f "$p1" && cmp "$p0" "$p1"
-	then
-		test_set_prereq TABS_IN_FILENAMES
-	fi
+	{ echo "Foo Bar Baz" >"$p2" || :; }
 '
 
-if ! test_have_prereq TABS_IN_FILENAMES
-then
-	# since FAT/NTFS does not allow tabs in filenames, skip this test
-	skip_all='Your filesystem does not allow tabs in filenames'
-	test_done
-fi
-
 test_expect_success 'setup: populate index and tree' '
 	git update-index --add "$p0" "$p2" &&
 	t0=$(git write-tree)
diff --git a/t/t3902-quoted.sh b/t/t3902-quoted.sh
index 534ee08a44..892f567844 100755
--- a/t/t3902-quoted.sh
+++ b/t/t3902-quoted.sh
@@ -16,9 +16,8 @@ echo foo 2>/dev/null > "Name and an${HT}HT"
 if ! test -f "Name and an${HT}HT"
 then
 	# FAT/NTFS does not allow tabs in filenames
-	say 'Your filesystem does not allow tabs in filenames'
-else
-	test_set_prereq TABS_IN_FILENAMES
+	skip_all='Your filesystem does not allow tabs in filenames'
+	test_done
 fi
 
 for_each_name () {
@@ -31,7 +30,7 @@ for_each_name () {
 	done
 }
 
-test_expect_success TABS_IN_FILENAMES 'setup' '
+test_expect_success 'setup' '
 
 	mkdir "$FN" &&
 	for_each_name "echo initial >\"\$name\"" &&
@@ -45,7 +44,7 @@ test_expect_success TABS_IN_FILENAMES 'setup' '
 
 '
 
-test_expect_success TABS_IN_FILENAMES 'setup expected files' '
+test_expect_success 'setup expected files' '
 cat >expect.quoted <<\EOF &&
 Name
 "Name and a\nLF"
@@ -75,74 +74,74 @@ With SP in it
 EOF
 '
 
-test_expect_success TABS_IN_FILENAMES 'check fully quoted output from ls-files' '
+test_expect_success 'check fully quoted output from ls-files' '
 
 	git ls-files >current && test_cmp expect.quoted current
 
 '
 
-test_expect_success TABS_IN_FILENAMES 'check fully quoted output from diff-files' '
+test_expect_success 'check fully quoted output from diff-files' '
 
 	git diff --name-only >current &&
 	test_cmp expect.quoted current
 
 '
 
-test_expect_success TABS_IN_FILENAMES 'check fully quoted output from diff-index' '
+test_expect_success 'check fully quoted output from diff-index' '
 
 	git diff --name-only HEAD >current &&
 	test_cmp expect.quoted current
 
 '
 
-test_expect_success TABS_IN_FILENAMES 'check fully quoted output from diff-tree' '
+test_expect_success 'check fully quoted output from diff-tree' '
 
 	git diff --name-only HEAD^ HEAD >current &&
 	test_cmp expect.quoted current
 
 '
 
-test_expect_success TABS_IN_FILENAMES 'check fully quoted output from ls-tree' '
+test_expect_success 'check fully quoted output from ls-tree' '
 
 	git ls-tree --name-only -r HEAD >current &&
 	test_cmp expect.quoted current
 
 '
 
-test_expect_success TABS_IN_FILENAMES 'setting core.quotepath' '
+test_expect_success 'setting core.quotepath' '
 
 	git config --bool core.quotepath false
 
 '
 
-test_expect_success TABS_IN_FILENAMES 'check fully quoted output from ls-files' '
+test_expect_success 'check fully quoted output from ls-files' '
 
 	git ls-files >current && test_cmp expect.raw current
 
 '
 
-test_expect_success TABS_IN_FILENAMES 'check fully quoted output from diff-files' '
+test_expect_success 'check fully quoted output from diff-files' '
 
 	git diff --name-only >current &&
 	test_cmp expect.raw current
 
 '
 
-test_expect_success TABS_IN_FILENAMES 'check fully quoted output from diff-index' '
+test_expect_success 'check fully quoted output from diff-index' '
 
 	git diff --name-only HEAD >current &&
 	test_cmp expect.raw current
 
 '
 
-test_expect_success TABS_IN_FILENAMES 'check fully quoted output from diff-tree' '
+test_expect_success 'check fully quoted output from diff-tree' '
 
 	git diff --name-only HEAD^ HEAD >current &&
 	test_cmp expect.raw current
 
 '
 
-test_expect_success TABS_IN_FILENAMES 'check fully quoted output from ls-tree' '
+test_expect_success 'check fully quoted output from ls-tree' '
 
 	git ls-tree --name-only -r HEAD >current &&
 	test_cmp expect.raw current
diff --git a/t/t4016-diff-quote.sh b/t/t4016-diff-quote.sh
index 97b81778cb..cd543ecc54 100755
--- a/t/t4016-diff-quote.sh
+++ b/t/t4016-diff-quote.sh
@@ -13,14 +13,12 @@ P1='pathname	with HT'
 P2='pathname with SP'
 P3='pathname
 with LF'
-if : 2>/dev/null >"$P1" && test -f "$P1" && rm -f "$P1"
-then
-	test_set_prereq TABS_IN_FILENAMES
-else
-	say 'Your filesystem does not allow tabs in filenames'
-fi
+echo 2>/dev/null >"$P1" && test -f "$P1" && rm -f "$P1" || {
+	skip_all='Your filesystem does not allow tabs in filenames'
+	test_done
+}
 
-test_expect_success TABS_IN_FILENAMES setup '
+test_expect_success setup '
 	echo P0.0 >"$P0.0" &&
 	echo P0.1 >"$P0.1" &&
 	echo P0.2 >"$P0.2" &&
@@ -40,7 +38,7 @@ test_expect_success TABS_IN_FILENAMES setup '
 	:
 '
 
-test_expect_success TABS_IN_FILENAMES 'setup expected files' '
+test_expect_success 'setup expected files' '
 cat >expect <<\EOF
  rename pathname.1 => "Rpathname\twith HT.0" (100%)
  rename pathname.3 => "Rpathname\nwith LF.0" (100%)
@@ -52,12 +50,12 @@ cat >expect <<\EOF
 EOF
 '
 
-test_expect_success TABS_IN_FILENAMES 'git diff --summary -M HEAD' '
+test_expect_success 'git diff --summary -M HEAD' '
 	git diff --summary -M HEAD >actual &&
 	test_cmp expect actual
 '
 
-test_expect_success TABS_IN_FILENAMES 'git diff --numstat -M HEAD' '
+test_expect_success 'git diff --numstat -M HEAD' '
 	cat >expect <<-\EOF &&
 	0	0	pathname.1 => "Rpathname\twith HT.0"
 	0	0	pathname.3 => "Rpathname\nwith LF.0"
@@ -71,7 +69,7 @@ test_expect_success TABS_IN_FILENAMES 'git diff --numstat -M HEAD' '
 	test_cmp expect actual
 '
 
-test_expect_success TABS_IN_FILENAMES 'git diff --stat -M HEAD' '
+test_expect_success 'git diff --stat -M HEAD' '
 	cat >expect <<-\EOF &&
 	 pathname.1 => "Rpathname\twith HT.0"            | 0
 	 pathname.3 => "Rpathname\nwith LF.0"            | 0
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 78c428619e..f8e3733ea0 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -100,12 +100,12 @@ unset CDPATH
 unset GREP_OPTIONS
 
 case $(echo $GIT_TRACE |tr "[A-Z]" "[a-z]") in
-	1|2|true)
-		echo "* warning: Some tests will not work if GIT_TRACE" \
-			"is set as to trace on STDERR ! *"
-		echo "* warning: Please set GIT_TRACE to something" \
-			"other than 1, 2 or true ! *"
-		;;
+1|2|true)
+	echo "* warning: Some tests will not work if GIT_TRACE" \
+		"is set as to trace on STDERR ! *"
+	echo "* warning: Please set GIT_TRACE to something" \
+		"other than 1, 2 or true ! *"
+	;;
 esac
 
 # Convenience
@@ -172,17 +172,23 @@ do
 	esac
 done
 
-if test -n "$color"; then
+if test -n "$color"
+then
 	say_color () {
 		(
 		TERM=$ORIGINAL_TERM
 		export TERM
 		case "$1" in
-			error) tput bold; tput setaf 1;; # bold red
-			skip)  tput bold; tput setaf 2;; # bold green
-			pass)  tput setaf 2;;            # green
-			info)  tput setaf 3;;            # brown
-			*) test -n "$quiet" && return;;
+		error)
+			tput bold; tput setaf 1;; # bold red
+		skip)
+			tput bold; tput setaf 2;; # bold green
+		pass)
+			tput setaf 2;;            # green
+		info)
+			tput setaf 3;;            # brown
+		*)
+			test -n "$quiet" && return;;
 		esac
 		shift
 		printf "%s" "$*"
@@ -298,7 +304,8 @@ test_run_ () {
 	then
 		test_eval_ "$test_cleanup"
 	fi
-	if test "$verbose" = "t" && test -n "$HARNESS_ACTIVE"; then
+	if test "$verbose" = "t" && test -n "$HARNESS_ACTIVE"
+	then
 		echo ""
 	fi
 	return "$eval_ret"
@@ -346,7 +353,8 @@ test_at_end_hook_ () {
 test_done () {
 	GIT_EXIT_OK=t
 
-	if test -z "$HARNESS_ACTIVE"; then
+	if test -z "$HARNESS_ACTIVE"
+	then
 		test_results_dir="$TEST_OUTPUT_DIRECTORY/test-results"
 		mkdir -p "$test_results_dir"
 		test_results_path="$test_results_dir/${0%.sh}-$$.counts"
@@ -375,10 +383,18 @@ test_done () {
 	case "$test_failure" in
 	0)
 		# Maybe print SKIP message
+		if test -n "$skip_all" && test $test_count -gt 0
+		then
+			error "Can't use skip_all after running some tests"
+		fi
 		[ -z "$skip_all" ] || skip_all=" # SKIP $skip_all"
 
-		if test $test_external_has_tap -eq 0; then
-			say_color pass "# passed all $msg"
+		if test $test_external_has_tap -eq 0
+		then
+			if test $test_count -gt 0
+			then
+				say_color pass "# passed all $msg"
+			fi
 			say "1..$test_count$skip_all"
 		fi
 
@@ -391,7 +407,8 @@ test_done () {
 		exit 0 ;;
 
 	*)
-		if test $test_external_has_tap -eq 0; then
+		if test $test_external_has_tap -eq 0
+		then
 			say_color error "# failed $test_failure among $msg"
 			say "1..$test_count"
 		fi
@@ -471,22 +488,26 @@ then
 	PATH=$GIT_VALGRIND/bin:$PATH
 	GIT_EXEC_PATH=$GIT_VALGRIND/bin
 	export GIT_VALGRIND
-elif test -n "$GIT_TEST_INSTALLED" ; then
+elif test -n "$GIT_TEST_INSTALLED"
+then
 	GIT_EXEC_PATH=$($GIT_TEST_INSTALLED/git --exec-path)  ||
 	error "Cannot run git from $GIT_TEST_INSTALLED."
 	PATH=$GIT_TEST_INSTALLED:$GIT_BUILD_DIR:$PATH
 	GIT_EXEC_PATH=${GIT_TEST_EXEC_PATH:-$GIT_EXEC_PATH}
 else # normal case, use ../bin-wrappers only unless $with_dashes:
 	git_bin_dir="$GIT_BUILD_DIR/bin-wrappers"
-	if ! test -x "$git_bin_dir/git" ; then
-		if test -z "$with_dashes" ; then
+	if ! test -x "$git_bin_dir/git"
+	then
+		if test -z "$with_dashes"
+		then
 			say "$git_bin_dir/git is not executable; using GIT_EXEC_PATH"
 		fi
 		with_dashes=t
 	fi
 	PATH="$git_bin_dir:$PATH"
 	GIT_EXEC_PATH=$GIT_BUILD_DIR
-	if test -n "$with_dashes" ; then
+	if test -n "$with_dashes"
+	then
 		PATH="$GIT_BUILD_DIR:$PATH"
 	fi
 fi
@@ -521,7 +542,8 @@ then
 	}
 fi
 
-if ! test -x "$GIT_BUILD_DIR"/test-chmtime; then
+if ! test -x "$GIT_BUILD_DIR"/test-chmtime
+then
 	echo >&2 'You need to build test-chmtime:'
 	echo >&2 'Run "make test-chmtime" in the source (toplevel) directory'
 	exit 1
@@ -544,7 +566,8 @@ rm -fr "$test" || {
 HOME="$TRASH_DIRECTORY"
 export HOME
 
-if test -z "$TEST_NO_CREATE_REPO"; then
+if test -z "$TEST_NO_CREATE_REPO"
+then
 	test_create_repo "$test"
 else
 	mkdir -p "$test"