[PATCH] t: use common $SQ variable

[Denton Liu <liu.denton@gmail.com>]

In many test scripts, there are bespoke definitions of the single quote
that are some variation of this:

    SQ="'"

Define a common $SQ variable in test-lib.sh and replace all usages of
these bespoke variables with the common one.

This change was done by running `git grep =\"\'\" t/` and
`git grep =\\\\\'` and manually changing the resulting definitions and
corresponding usages.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
---

[whoops, forgot to include the mailing list in the last email]

Sorry, I wrote this patch up before I saw the email about leaving this
as #leftoverbits. No point in letting it go to waste, though.

 t/t1300-config.sh              |  9 +++--
 t/t1404-update-ref-errors.sh   | 64 ++++++++++++++++------------------
 t/t1414-reflog-walk.sh         |  3 +-
 t/t1506-rev-parse-diagnosis.sh |  5 ++-
 t/t1507-rev-parse-upstream.sh  | 12 +++----
 t/t3005-ls-files-relative.sh   |  9 +++--
 t/t3404-rebase-interactive.sh  |  1 -
 t/t3430-rebase-merges.sh       |  1 -
 t/t5601-clone.sh               |  1 -
 t/t7406-submodule-update.sh    |  3 +-
 t/test-lib.sh                  |  3 ++
 11 files changed, 51 insertions(+), 60 deletions(-)

diff --git a/t/t1300-config.sh b/t/t1300-config.sh
index 428177c390..983a0a1583 100755
--- a/t/t1300-config.sh
+++ b/t/t1300-config.sh
@@ -1294,26 +1294,25 @@ test_expect_success 'git -c is not confused by empty environment' '
 	GIT_CONFIG_PARAMETERS="" git -c x.one=1 config --list
 '
 
-sq="'"
 test_expect_success 'detect bogus GIT_CONFIG_PARAMETERS' '
 	cat >expect <<-\EOF &&
 	env.one one
 	env.two two
 	EOF
-	GIT_CONFIG_PARAMETERS="${sq}env.one=one${sq} ${sq}env.two=two${sq}" \
+	GIT_CONFIG_PARAMETERS="${SQ}env.one=one${SQ} ${SQ}env.two=two${SQ}" \
 		git config --get-regexp "env.*" >actual &&
 	test_cmp expect actual &&
 
 	cat >expect <<-EOF &&
-	env.one one${sq}
+	env.one one${SQ}
 	env.two two
 	EOF
-	GIT_CONFIG_PARAMETERS="${sq}env.one=one${sq}\\$sq$sq$sq ${sq}env.two=two${sq}" \
+	GIT_CONFIG_PARAMETERS="${SQ}env.one=one${SQ}\\$SQ$SQ$SQ ${SQ}env.two=two${SQ}" \
 		git config --get-regexp "env.*" >actual &&
 	test_cmp expect actual &&
 
 	test_must_fail env \
-		GIT_CONFIG_PARAMETERS="${sq}env.one=one${sq}\\$sq ${sq}env.two=two${sq}" \
+		GIT_CONFIG_PARAMETERS="${SQ}env.one=one${SQ}\\$SQ ${SQ}env.two=two${SQ}" \
 		git config --get-regexp "env.*"
 '
 
diff --git a/t/t1404-update-ref-errors.sh b/t/t1404-update-ref-errors.sh
index 970c5c36b9..2d142e5535 100755
--- a/t/t1404-update-ref-errors.sh
+++ b/t/t1404-update-ref-errors.sh
@@ -32,8 +32,6 @@ test_update_rejected () {
 	test_cmp unchanged actual
 }
 
-Q="'"
-
 # Test adding and deleting D/F-conflicting references in a single
 # transaction.
 df_test() {
@@ -93,7 +91,7 @@ df_test() {
 		delname="$delref"
 	fi &&
 	cat >expected-err <<-EOF &&
-	fatal: cannot lock ref $Q$addname$Q: $Q$delref$Q exists; cannot create $Q$addref$Q
+	fatal: cannot lock ref $SQ$addname$SQ: $SQ$delref$SQ exists; cannot create $SQ$addref$SQ
 	EOF
 	$pack &&
 	if $add_del
@@ -123,7 +121,7 @@ test_expect_success 'existing loose ref is a simple prefix of new' '
 
 	prefix=refs/1l &&
 	test_update_rejected "a c e" false "b c/x d" \
-		"$Q$prefix/c$Q exists; cannot create $Q$prefix/c/x$Q"
+		"$SQ$prefix/c$SQ exists; cannot create $SQ$prefix/c/x$SQ"
 
 '
 
@@ -131,7 +129,7 @@ test_expect_success 'existing packed ref is a simple prefix of new' '
 
 	prefix=refs/1p &&
 	test_update_rejected "a c e" true "b c/x d" \
-		"$Q$prefix/c$Q exists; cannot create $Q$prefix/c/x$Q"
+		"$SQ$prefix/c$SQ exists; cannot create $SQ$prefix/c/x$SQ"
 
 '
 
@@ -139,7 +137,7 @@ test_expect_success 'existing loose ref is a deeper prefix of new' '
 
 	prefix=refs/2l &&
 	test_update_rejected "a c e" false "b c/x/y d" \
-		"$Q$prefix/c$Q exists; cannot create $Q$prefix/c/x/y$Q"
+		"$SQ$prefix/c$SQ exists; cannot create $SQ$prefix/c/x/y$SQ"
 
 '
 
@@ -147,7 +145,7 @@ test_expect_success 'existing packed ref is a deeper prefix of new' '
 
 	prefix=refs/2p &&
 	test_update_rejected "a c e" true "b c/x/y d" \
-		"$Q$prefix/c$Q exists; cannot create $Q$prefix/c/x/y$Q"
+		"$SQ$prefix/c$SQ exists; cannot create $SQ$prefix/c/x/y$SQ"
 
 '
 
@@ -155,7 +153,7 @@ test_expect_success 'new ref is a simple prefix of existing loose' '
 
 	prefix=refs/3l &&
 	test_update_rejected "a c/x e" false "b c d" \
-		"$Q$prefix/c/x$Q exists; cannot create $Q$prefix/c$Q"
+		"$SQ$prefix/c/x$SQ exists; cannot create $SQ$prefix/c$SQ"
 
 '
 
@@ -163,7 +161,7 @@ test_expect_success 'new ref is a simple prefix of existing packed' '
 
 	prefix=refs/3p &&
 	test_update_rejected "a c/x e" true "b c d" \
-		"$Q$prefix/c/x$Q exists; cannot create $Q$prefix/c$Q"
+		"$SQ$prefix/c/x$SQ exists; cannot create $SQ$prefix/c$SQ"
 
 '
 
@@ -171,7 +169,7 @@ test_expect_success 'new ref is a deeper prefix of existing loose' '
 
 	prefix=refs/4l &&
 	test_update_rejected "a c/x/y e" false "b c d" \
-		"$Q$prefix/c/x/y$Q exists; cannot create $Q$prefix/c$Q"
+		"$SQ$prefix/c/x/y$SQ exists; cannot create $SQ$prefix/c$SQ"
 
 '
 
@@ -179,7 +177,7 @@ test_expect_success 'new ref is a deeper prefix of existing packed' '
 
 	prefix=refs/4p &&
 	test_update_rejected "a c/x/y e" true "b c d" \
-		"$Q$prefix/c/x/y$Q exists; cannot create $Q$prefix/c$Q"
+		"$SQ$prefix/c/x/y$SQ exists; cannot create $SQ$prefix/c$SQ"
 
 '
 
@@ -187,7 +185,7 @@ test_expect_success 'one new ref is a simple prefix of another' '
 
 	prefix=refs/5 &&
 	test_update_rejected "a e" false "b c c/x d" \
-		"cannot process $Q$prefix/c$Q and $Q$prefix/c/x$Q at the same time"
+		"cannot process $SQ$prefix/c$SQ and $SQ$prefix/c/x$SQ at the same time"
 
 '
 
@@ -334,7 +332,7 @@ test_expect_success 'D/F conflict prevents indirect delete long packed + indirec
 test_expect_success 'missing old value blocks update' '
 	prefix=refs/missing-update &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/foo$Q: unable to resolve reference $Q$prefix/foo$Q
+	fatal: cannot lock ref $SQ$prefix/foo$SQ: unable to resolve reference $SQ$prefix/foo$SQ
 	EOF
 	printf "%s\n" "update $prefix/foo $E $D" |
 	test_must_fail git update-ref --stdin 2>output.err &&
@@ -345,7 +343,7 @@ test_expect_success 'incorrect old value blocks update' '
 	prefix=refs/incorrect-update &&
 	git update-ref $prefix/foo $C &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/foo$Q: is at $C but expected $D
+	fatal: cannot lock ref $SQ$prefix/foo$SQ: is at $C but expected $D
 	EOF
 	printf "%s\n" "update $prefix/foo $E $D" |
 	test_must_fail git update-ref --stdin 2>output.err &&
@@ -356,7 +354,7 @@ test_expect_success 'existing old value blocks create' '
 	prefix=refs/existing-create &&
 	git update-ref $prefix/foo $C &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/foo$Q: reference already exists
+	fatal: cannot lock ref $SQ$prefix/foo$SQ: reference already exists
 	EOF
 	printf "%s\n" "create $prefix/foo $E" |
 	test_must_fail git update-ref --stdin 2>output.err &&
@@ -367,7 +365,7 @@ test_expect_success 'incorrect old value blocks delete' '
 	prefix=refs/incorrect-delete &&
 	git update-ref $prefix/foo $C &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/foo$Q: is at $C but expected $D
+	fatal: cannot lock ref $SQ$prefix/foo$SQ: is at $C but expected $D
 	EOF
 	printf "%s\n" "delete $prefix/foo $D" |
 	test_must_fail git update-ref --stdin 2>output.err &&
@@ -378,7 +376,7 @@ test_expect_success 'missing old value blocks indirect update' '
 	prefix=refs/missing-indirect-update &&
 	git symbolic-ref $prefix/symref $prefix/foo &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/symref$Q: unable to resolve reference $Q$prefix/foo$Q
+	fatal: cannot lock ref $SQ$prefix/symref$SQ: unable to resolve reference $SQ$prefix/foo$SQ
 	EOF
 	printf "%s\n" "update $prefix/symref $E $D" |
 	test_must_fail git update-ref --stdin 2>output.err &&
@@ -390,7 +388,7 @@ test_expect_success 'incorrect old value blocks indirect update' '
 	git symbolic-ref $prefix/symref $prefix/foo &&
 	git update-ref $prefix/foo $C &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/symref$Q: is at $C but expected $D
+	fatal: cannot lock ref $SQ$prefix/symref$SQ: is at $C but expected $D
 	EOF
 	printf "%s\n" "update $prefix/symref $E $D" |
 	test_must_fail git update-ref --stdin 2>output.err &&
@@ -402,7 +400,7 @@ test_expect_success 'existing old value blocks indirect create' '
 	git symbolic-ref $prefix/symref $prefix/foo &&
 	git update-ref $prefix/foo $C &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/symref$Q: reference already exists
+	fatal: cannot lock ref $SQ$prefix/symref$SQ: reference already exists
 	EOF
 	printf "%s\n" "create $prefix/symref $E" |
 	test_must_fail git update-ref --stdin 2>output.err &&
@@ -414,7 +412,7 @@ test_expect_success 'incorrect old value blocks indirect delete' '
 	git symbolic-ref $prefix/symref $prefix/foo &&
 	git update-ref $prefix/foo $C &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/symref$Q: is at $C but expected $D
+	fatal: cannot lock ref $SQ$prefix/symref$SQ: is at $C but expected $D
 	EOF
 	printf "%s\n" "delete $prefix/symref $D" |
 	test_must_fail git update-ref --stdin 2>output.err &&
@@ -425,7 +423,7 @@ test_expect_success 'missing old value blocks indirect no-deref update' '
 	prefix=refs/missing-noderef-update &&
 	git symbolic-ref $prefix/symref $prefix/foo &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/symref$Q: reference is missing but expected $D
+	fatal: cannot lock ref $SQ$prefix/symref$SQ: reference is missing but expected $D
 	EOF
 	printf "%s\n" "option no-deref" "update $prefix/symref $E $D" |
 	test_must_fail git update-ref --stdin 2>output.err &&
@@ -437,7 +435,7 @@ test_expect_success 'incorrect old value blocks indirect no-deref update' '
 	git symbolic-ref $prefix/symref $prefix/foo &&
 	git update-ref $prefix/foo $C &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/symref$Q: is at $C but expected $D
+	fatal: cannot lock ref $SQ$prefix/symref$SQ: is at $C but expected $D
 	EOF
 	printf "%s\n" "option no-deref" "update $prefix/symref $E $D" |
 	test_must_fail git update-ref --stdin 2>output.err &&
@@ -449,7 +447,7 @@ test_expect_success 'existing old value blocks indirect no-deref create' '
 	git symbolic-ref $prefix/symref $prefix/foo &&
 	git update-ref $prefix/foo $C &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/symref$Q: reference already exists
+	fatal: cannot lock ref $SQ$prefix/symref$SQ: reference already exists
 	EOF
 	printf "%s\n" "option no-deref" "create $prefix/symref $E" |
 	test_must_fail git update-ref --stdin 2>output.err &&
@@ -461,7 +459,7 @@ test_expect_success 'incorrect old value blocks indirect no-deref delete' '
 	git symbolic-ref $prefix/symref $prefix/foo &&
 	git update-ref $prefix/foo $C &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/symref$Q: is at $C but expected $D
+	fatal: cannot lock ref $SQ$prefix/symref$SQ: is at $C but expected $D
 	EOF
 	printf "%s\n" "option no-deref" "delete $prefix/symref $D" |
 	test_must_fail git update-ref --stdin 2>output.err &&
@@ -474,13 +472,13 @@ test_expect_success 'non-empty directory blocks create' '
 	: >.git/$prefix/foo/bar/baz.lock &&
 	test_when_finished "rm -f .git/$prefix/foo/bar/baz.lock" &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/foo$Q: there is a non-empty directory $Q.git/$prefix/foo$Q blocking reference $Q$prefix/foo$Q
+	fatal: cannot lock ref $SQ$prefix/foo$SQ: there is a non-empty directory $SQ.git/$prefix/foo$SQ blocking reference $SQ$prefix/foo$SQ
 	EOF
 	printf "%s\n" "update $prefix/foo $C" |
 	test_must_fail git update-ref --stdin 2>output.err &&
 	test_cmp expected output.err &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/foo$Q: unable to resolve reference $Q$prefix/foo$Q
+	fatal: cannot lock ref $SQ$prefix/foo$SQ: unable to resolve reference $SQ$prefix/foo$SQ
 	EOF
 	printf "%s\n" "update $prefix/foo $D $C" |
 	test_must_fail git update-ref --stdin 2>output.err &&
@@ -493,13 +491,13 @@ test_expect_success 'broken reference blocks create' '
 	echo "gobbledigook" >.git/$prefix/foo &&
 	test_when_finished "rm -f .git/$prefix/foo" &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/foo$Q: unable to resolve reference $Q$prefix/foo$Q: reference broken
+	fatal: cannot lock ref $SQ$prefix/foo$SQ: unable to resolve reference $SQ$prefix/foo$SQ: reference broken
 	EOF
 	printf "%s\n" "update $prefix/foo $C" |
 	test_must_fail git update-ref --stdin 2>output.err &&
 	test_cmp expected output.err &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/foo$Q: unable to resolve reference $Q$prefix/foo$Q: reference broken
+	fatal: cannot lock ref $SQ$prefix/foo$SQ: unable to resolve reference $SQ$prefix/foo$SQ: reference broken
 	EOF
 	printf "%s\n" "update $prefix/foo $D $C" |
 	test_must_fail git update-ref --stdin 2>output.err &&
@@ -513,13 +511,13 @@ test_expect_success 'non-empty directory blocks indirect create' '
 	: >.git/$prefix/foo/bar/baz.lock &&
 	test_when_finished "rm -f .git/$prefix/foo/bar/baz.lock" &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/symref$Q: there is a non-empty directory $Q.git/$prefix/foo$Q blocking reference $Q$prefix/foo$Q
+	fatal: cannot lock ref $SQ$prefix/symref$SQ: there is a non-empty directory $SQ.git/$prefix/foo$SQ blocking reference $SQ$prefix/foo$SQ
 	EOF
 	printf "%s\n" "update $prefix/symref $C" |
 	test_must_fail git update-ref --stdin 2>output.err &&
 	test_cmp expected output.err &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/symref$Q: unable to resolve reference $Q$prefix/foo$Q
+	fatal: cannot lock ref $SQ$prefix/symref$SQ: unable to resolve reference $SQ$prefix/foo$SQ
 	EOF
 	printf "%s\n" "update $prefix/symref $D $C" |
 	test_must_fail git update-ref --stdin 2>output.err &&
@@ -532,13 +530,13 @@ test_expect_success 'broken reference blocks indirect create' '
 	echo "gobbledigook" >.git/$prefix/foo &&
 	test_when_finished "rm -f .git/$prefix/foo" &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/symref$Q: unable to resolve reference $Q$prefix/foo$Q: reference broken
+	fatal: cannot lock ref $SQ$prefix/symref$SQ: unable to resolve reference $SQ$prefix/foo$SQ: reference broken
 	EOF
 	printf "%s\n" "update $prefix/symref $C" |
 	test_must_fail git update-ref --stdin 2>output.err &&
 	test_cmp expected output.err &&
 	cat >expected <<-EOF &&
-	fatal: cannot lock ref $Q$prefix/symref$Q: unable to resolve reference $Q$prefix/foo$Q: reference broken
+	fatal: cannot lock ref $SQ$prefix/symref$SQ: unable to resolve reference $SQ$prefix/foo$SQ: reference broken
 	EOF
 	printf "%s\n" "update $prefix/symref $D $C" |
 	test_must_fail git update-ref --stdin 2>output.err &&
@@ -614,7 +612,7 @@ test_expect_success 'delete fails cleanly if packed-refs file is locked' '
 	test_when_finished "rm -f .git/packed-refs.lock" &&
 	test_must_fail git update-ref -d $prefix/foo >out 2>err &&
 	git for-each-ref $prefix >actual &&
-	test_i18ngrep "Unable to create $Q.*packed-refs.lock$Q: " err &&
+	test_i18ngrep "Unable to create $SQ.*packed-refs.lock$SQ: " err &&
 	test_cmp unchanged actual
 '
 
diff --git a/t/t1414-reflog-walk.sh b/t/t1414-reflog-walk.sh
index feb1efd8ff..1181a9fb28 100755
--- a/t/t1414-reflog-walk.sh
+++ b/t/t1414-reflog-walk.sh
@@ -18,10 +18,9 @@ do_walk () {
 	git log -g --format="%gd %gs" "$@"
 }
 
-sq="'"
 test_expect_success 'set up expected reflog' '
 	cat >expect.all <<-EOF
-	HEAD@{0} commit (merge): Merge branch ${sq}master${sq} into side
+	HEAD@{0} commit (merge): Merge branch ${SQ}master${SQ} into side
 	HEAD@{1} commit: three
 	HEAD@{2} checkout: moving from master to side
 	HEAD@{3} commit: two
diff --git a/t/t1506-rev-parse-diagnosis.sh b/t/t1506-rev-parse-diagnosis.sh
index 4ee009da66..21a9c8ffb2 100755
--- a/t/t1506-rev-parse-diagnosis.sh
+++ b/t/t1506-rev-parse-diagnosis.sh
@@ -8,10 +8,9 @@ exec </dev/null
 
 test_did_you_mean ()
 {
-	sq="'" &&
 	cat >expected <<-EOF &&
-	fatal: Path '$2$3' $4, but not ${5:-$sq$3$sq}.
-	Did you mean '$1:$2$3'${2:+ aka $sq$1:./$3$sq}?
+	fatal: Path '$2$3' $4, but not ${5:-$SQ$3$SQ}.
+	Did you mean '$1:$2$3'${2:+ aka $SQ$1:./$3$SQ}?
 	EOF
 	test_cmp expected error
 }
diff --git a/t/t1507-rev-parse-upstream.sh b/t/t1507-rev-parse-upstream.sh
index fa3e499641..8b4cf8a6e3 100755
--- a/t/t1507-rev-parse-upstream.sh
+++ b/t/t1507-rev-parse-upstream.sh
@@ -28,8 +28,6 @@ test_expect_success 'setup' '
 	)
 '
 
-sq="'"
-
 full_name () {
 	(cd clone &&
 	 git rev-parse --symbolic-full-name "$@")
@@ -129,7 +127,7 @@ test_expect_success 'merge my-side@{u} records the correct name' '
 	git branch -t new my-side@{u} &&
 	git merge -s ours new@{u} &&
 	git show -s --pretty=tformat:%s >actual &&
-	echo "Merge remote-tracking branch ${sq}origin/side${sq}" >expect &&
+	echo "Merge remote-tracking branch ${SQ}origin/side${SQ}" >expect &&
 	test_cmp expect actual
 )
 '
@@ -156,7 +154,7 @@ test_expect_success 'branch@{u} works when tracking a local branch' '
 
 test_expect_success 'branch@{u} error message when no upstream' '
 	cat >expect <<-EOF &&
-	fatal: no upstream configured for branch ${sq}non-tracking${sq}
+	fatal: no upstream configured for branch ${SQ}non-tracking${SQ}
 	EOF
 	error_message non-tracking@{u} &&
 	test_i18ncmp expect error
@@ -164,7 +162,7 @@ test_expect_success 'branch@{u} error message when no upstream' '
 
 test_expect_success '@{u} error message when no upstream' '
 	cat >expect <<-EOF &&
-	fatal: no upstream configured for branch ${sq}master${sq}
+	fatal: no upstream configured for branch ${SQ}master${SQ}
 	EOF
 	test_must_fail git rev-parse --verify @{u} 2>actual &&
 	test_i18ncmp expect actual
@@ -172,7 +170,7 @@ test_expect_success '@{u} error message when no upstream' '
 
 test_expect_success 'branch@{u} error message with misspelt branch' '
 	cat >expect <<-EOF &&
-	fatal: no such branch: ${sq}no-such-branch${sq}
+	fatal: no such branch: ${SQ}no-such-branch${SQ}
 	EOF
 	error_message no-such-branch@{u} &&
 	test_i18ncmp expect error
@@ -189,7 +187,7 @@ test_expect_success '@{u} error message when not on a branch' '
 
 test_expect_success 'branch@{u} error message if upstream branch not fetched' '
 	cat >expect <<-EOF &&
-	fatal: upstream branch ${sq}refs/heads/side${sq} not stored as a remote-tracking branch
+	fatal: upstream branch ${SQ}refs/heads/side${SQ} not stored as a remote-tracking branch
 	EOF
 	error_message bad-upstream@{u} &&
 	test_i18ncmp expect error
diff --git a/t/t3005-ls-files-relative.sh b/t/t3005-ls-files-relative.sh
index 209b4c7cd8..c841f9b454 100755
--- a/t/t3005-ls-files-relative.sh
+++ b/t/t3005-ls-files-relative.sh
@@ -9,7 +9,6 @@ This test runs git ls-files with various relative path arguments.
 
 new_line='
 '
-sq=\'
 
 test_expect_success 'prepare' '
 	: >never-mind-me &&
@@ -44,9 +43,9 @@ test_expect_success 'ls-files -c' '
 		cd top/sub &&
 		for f in ../y*
 		do
-			echo "error: pathspec $sq$f$sq did not match any file(s) known to git"
+			echo "error: pathspec $SQ$f$SQ did not match any file(s) known to git"
 		done >expect.err &&
-		echo "Did you forget to ${sq}git add${sq}?" >>expect.err &&
+		echo "Did you forget to ${SQ}git add${SQ}?" >>expect.err &&
 		ls ../x* >expect.out &&
 		test_must_fail git ls-files -c --error-unmatch ../[xy]* >actual.out 2>actual.err &&
 		test_cmp expect.out actual.out &&
@@ -59,9 +58,9 @@ test_expect_success 'ls-files -o' '
 		cd top/sub &&
 		for f in ../x*
 		do
-			echo "error: pathspec $sq$f$sq did not match any file(s) known to git"
+			echo "error: pathspec $SQ$f$SQ did not match any file(s) known to git"
 		done >expect.err &&
-		echo "Did you forget to ${sq}git add${sq}?" >>expect.err &&
+		echo "Did you forget to ${SQ}git add${SQ}?" >>expect.err &&
 		ls ../y* >expect.out &&
 		test_must_fail git ls-files -o --error-unmatch ../[xy]* >actual.out 2>actual.err &&
 		test_cmp expect.out actual.out &&
diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
index 461dd539ff..9c152b6245 100755
--- a/t/t3404-rebase-interactive.sh
+++ b/t/t3404-rebase-interactive.sh
@@ -1419,7 +1419,6 @@ test_expect_success 'editor saves as CR/LF' '
 	)
 '
 
-SQ="'"
 test_expect_success 'rebase -i --gpg-sign=<key-id>' '
 	test_when_finished "test_might_fail git rebase --abort" &&
 	set_fake_editor &&
diff --git a/t/t3430-rebase-merges.sh b/t/t3430-rebase-merges.sh
index 7b6c4847ad..11141ac864 100755
--- a/t/t3430-rebase-merges.sh
+++ b/t/t3430-rebase-merges.sh
@@ -151,7 +151,6 @@ test_expect_success 'failed `merge -C` writes patch (may be rescheduled, too)' '
 	test_path_is_file .git/rebase-merge/patch
 '
 
-SQ="'"
 test_expect_success 'failed `merge <branch>` does not crash' '
 	test_when_finished "test_might_fail git rebase --abort" &&
 	git checkout conflicting-G &&
diff --git a/t/t5601-clone.sh b/t/t5601-clone.sh
index 4a3b901f06..3be025a658 100755
--- a/t/t5601-clone.sh
+++ b/t/t5601-clone.sh
@@ -434,7 +434,6 @@ test_expect_success 'double quoted plink.exe in GIT_SSH_COMMAND' '
 	expect_ssh "-v -P 123" myhost src
 '
 
-SQ="'"
 test_expect_success 'single quoted plink.exe in GIT_SSH_COMMAND' '
 	copy_ssh_wrapper_as "$TRASH_DIRECTORY/plink.exe" &&
 	GIT_SSH_COMMAND="$SQ$TRASH_DIRECTORY/plink.exe$SQ -v" \
diff --git a/t/t7406-submodule-update.sh b/t/t7406-submodule-update.sh
index c973278300..df34c994d2 100755
--- a/t/t7406-submodule-update.sh
+++ b/t/t7406-submodule-update.sh
@@ -158,7 +158,6 @@ test_expect_success 'submodule update --init from and of subdirectory' '
 	test_i18ncmp expect2 actual2
 '
 
-apos="'";
 test_expect_success 'submodule update does not fetch already present commits' '
 	(cd submodule &&
 	  echo line3 >> file &&
@@ -168,7 +167,7 @@ test_expect_success 'submodule update does not fetch already present commits' '
 	) &&
 	(cd super/submodule &&
 	  head=$(git rev-parse --verify HEAD) &&
-	  echo "Submodule path ${apos}submodule$apos: checked out $apos$head$apos" > ../../expected &&
+	  echo "Submodule path ${SQ}submodule$SQ: checked out $SQ$head$SQ" > ../../expected &&
 	  git reset --hard HEAD~1
 	) &&
 	(cd super &&
diff --git a/t/test-lib.sh b/t/test-lib.sh
index a9d45642a5..ee602c4d9c 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -509,6 +509,9 @@ EMPTY_BLOB=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
 LF='
 '
 
+# Single quote
+SQ=\'
+
 # UTF-8 ZERO WIDTH NON-JOINER, which HFS+ ignores
 # when case-folding filenames
 u200c=$(printf '\342\200\214')
-- 
2.23.0.37.g745f681289