Merge branch 'ab/i18n-st'

* ab/i18n-st: (69 commits)
  i18n: git-shortlog basic messages
  i18n: git-revert split up "could not revert/apply" message
  i18n: git-revert literal "me" messages
  i18n: git-revert "Your local changes" message
  i18n: git-revert basic messages
  i18n: git-notes GIT_NOTES_REWRITE_MODE error message
  i18n: git-notes basic commands
  i18n: git-gc "Auto packing the repository" message
  i18n: git-gc basic messages
  i18n: git-describe basic messages
  i18n: git-clean clean.requireForce messages
  i18n: git-clean basic messages
  i18n: git-bundle basic messages
  i18n: git-archive basic messages
  i18n: git-status "renamed: " message
  i18n: git-status "Initial commit" message
  i18n: git-status "Changes to be committed" message
  i18n: git-status shortstatus messages
  i18n: git-status "nothing to commit" messages
  i18n: git-status basic messages
  ...

Conflicts:
	builtin/branch.c
	builtin/checkout.c
	builtin/clone.c
	builtin/commit.c
	builtin/grep.c
	builtin/merge.c
	builtin/push.c
	builtin/revert.c
	t/t3507-cherry-pick-conflict.sh
	t/t7607-merge-overwrite.sh

34 files changed, 257 insertions, 156 deletions

diff --git a/t/lib-httpd.sh b/t/lib-httpd.sh
index 3f2438437..d3829b8d0 100644
--- a/t/lib-httpd.sh
+++ b/t/lib-httpd.sh
@@ -157,7 +157,7 @@ test_http_push_nonff() {
 		grep "^ ! \[rejected\][ ]*$BRANCH -> $BRANCH (non-fast-forward)$" output
 	'
 
-	test_expect_success 'non-fast-forward push shows help message' '
+	test_expect_success C_LOCALE_OUTPUT 'non-fast-forward push shows help message' '
 		grep "To prevent you from losing history, non-fast-forward updates were rejected" \
 			output
 	'
diff --git a/t/t0001-init.sh b/t/t0001-init.sh
index ce4ba1379..0ee9f1799 100755
--- a/t/t0001-init.sh
+++ b/t/t0001-init.sh
@@ -180,7 +180,7 @@ test_expect_success 'GIT_DIR & GIT_WORK_TREE (2)' '
 	fi
 '
 
-test_expect_success 'reinit' '
+test_expect_success C_LOCALE_OUTPUT 'reinit' '
 
 	(
 		sane_unset GIT_CONFIG GIT_WORK_TREE GIT_CONFIG &&
diff --git a/t/t1200-tutorial.sh b/t/t1200-tutorial.sh
index bfa2c2190..3264fefba 100755
--- a/t/t1200-tutorial.sh
+++ b/t/t1200-tutorial.sh
@@ -163,7 +163,10 @@ test_expect_success 'git resolve' '
 	git checkout mybranch &&
 	git merge -m "Merge upstream changes." master |
 		sed -e "1s/[0-9a-f]\{7\}/VARIABLE/g" \
-		-e "s/^Fast[- ]forward /FASTFORWARD /" >resolve.output &&
+		-e "s/^Fast[- ]forward /FASTFORWARD /" >resolve.output
+'
+
+test_expect_success C_LOCALE_OUTPUT 'git resolve output' '
 	test_cmp resolve.expect resolve.output
 '
 
diff --git a/t/t2200-add-update.sh b/t/t2200-add-update.sh
index 0692427cb..856e7da1f 100755
--- a/t/t2200-add-update.sh
+++ b/t/t2200-add-update.sh
@@ -111,7 +111,7 @@ test_expect_success 'touch and then add explicitly' '
 
 '
 
-test_expect_success 'add -n -u should not add but just report' '
+test_expect_success C_LOCALE_OUTPUT 'add -n -u should not add but just report' '
 
 	(
 		echo "add '\''check'\''" &&
diff --git a/t/t2204-add-ignored.sh b/t/t2204-add-ignored.sh
index 24afdabab..49753362f 100755
--- a/t/t2204-add-ignored.sh
+++ b/t/t2204-add-ignored.sh
@@ -31,18 +31,21 @@ do
 		rm -f .git/index &&
 		test_must_fail git add "$i" 2>err &&
 		git ls-files "$i" >out &&
-		! test -s out &&
-		grep -e "Use -f if" err &&
-		cat err
+		! test -s out
+	'
+
+	test_expect_success C_LOCALE_OUTPUT "complaints for ignored $i output" '
+		grep -e "Use -f if" err
 	'
 
 	test_expect_success "complaints for ignored $i with unignored file" '
 		rm -f .git/index &&
 		test_must_fail git add "$i" file 2>err &&
 		git ls-files "$i" >out &&
-		! test -s out &&
-		grep -e "Use -f if" err &&
-		cat err
+		! test -s out
+	'
+	test_expect_success C_LOCALE_OUTPUT "complaints for ignored $i with unignored file output" '
+		grep -e "Use -f if" err
 	'
 done
 
@@ -54,9 +57,14 @@ do
 			cd dir &&
 			test_must_fail git add "$i" 2>err &&
 			git ls-files "$i" >out &&
-			! test -s out &&
-			grep -e "Use -f if" err &&
-			cat err
+			! test -s out
+		)
+	'
+
+	test_expect_success C_LOCALE_OUTPUT "complaints for ignored $i in dir output" '
+		(
+			cd dir &&
+			grep -e "Use -f if" err
 		)
 	'
 done
@@ -69,9 +77,14 @@ do
 			cd sub &&
 			test_must_fail git add "$i" 2>err &&
 			git ls-files "$i" >out &&
-			! test -s out &&
-			grep -e "Use -f if" err &&
-			cat err
+			! test -s out
+		)
+	'
+
+	test_expect_success C_LOCALE_OUTPUT "complaints for ignored $i in sub output" '
+		(
+			cd sub &&
+			grep -e "Use -f if" err
 		)
 	'
 done
diff --git a/t/t3030-merge-recursive.sh b/t/t3030-merge-recursive.sh
index 34794f8a7..806fdccce 100755
--- a/t/t3030-merge-recursive.sh
+++ b/t/t3030-merge-recursive.sh
@@ -312,7 +312,7 @@ test_expect_success 'merge-recursive result' '
 
 '
 
-test_expect_success 'fail if the index has unresolved entries' '
+test_expect_success C_LOCALE_OUTPUT 'fail if the index has unresolved entries' '
 
 	rm -fr [abcd] &&
 	git checkout -f "$c1" &&
diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index 78ce09f9d..286a2a686 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -203,7 +203,7 @@ test_expect_success 'test deleting branch deletes branch config' \
      test -z "$(git config branch.my7.remote)" &&
      test -z "$(git config branch.my7.merge)"'
 
-test_expect_success 'test deleting branch without config' \
+test_expect_success C_LOCALE_OUTPUT 'test deleting branch without config' \
     'git branch my7 s &&
      sha1=$(git rev-parse my7 | cut -c 1-7) &&
      test "$(git branch -d my7 2>&1)" = "Deleted branch my7 (was $sha1)."'
diff --git a/t/t3203-branch-output.sh b/t/t3203-branch-output.sh
index 6028748c6..4ef7d0911 100755
--- a/t/t3203-branch-output.sh
+++ b/t/t3203-branch-output.sh
@@ -72,7 +72,7 @@ cat >expect <<'EOF'
   branch-two
   master
 EOF
-test_expect_success 'git branch shows detached HEAD properly' '
+test_expect_success C_LOCALE_OUTPUT 'git branch shows detached HEAD properly' '
 	git checkout HEAD^0 &&
 	git branch >actual &&
 	test_cmp expect actual
diff --git a/t/t3501-revert-cherry-pick.sh b/t/t3501-revert-cherry-pick.sh
index 043954422..753a6c972 100755
--- a/t/t3501-revert-cherry-pick.sh
+++ b/t/t3501-revert-cherry-pick.sh
@@ -91,7 +91,7 @@ test_expect_success 'cherry-pick on stat-dirty working tree' '
 	)
 '
 
-test_expect_success 'revert forbidden on dirty working tree' '
+test_expect_success C_LOCALE_OUTPUT 'revert forbidden on dirty working tree' '
 
 	echo content >extra_file &&
 	git add extra_file &&
diff --git a/t/t3507-cherry-pick-conflict.sh b/t/t3507-cherry-pick-conflict.sh
index 95741801b..c0c8330c2 100755
--- a/t/t3507-cherry-pick-conflict.sh
+++ b/t/t3507-cherry-pick-conflict.sh
@@ -44,7 +44,7 @@ test_expect_success 'failed cherry-pick does not advance HEAD' '
 	test "$head" = "$newhead"
 '
 
-test_expect_success 'advice from failed cherry-pick' "
+test_expect_success C_LOCALE_OUTPUT 'advice from failed cherry-pick' "
 	pristine_detach initial &&
 
 	picked=\$(git rev-parse --short picked) &&
diff --git a/t/t3700-add.sh b/t/t3700-add.sh
index ec7108358..7de42faf4 100755
--- a/t/t3700-add.sh
+++ b/t/t3700-add.sh
@@ -268,8 +268,12 @@ test_expect_success 'git add --dry-run of existing changed file' "
 
 test_expect_success 'git add --dry-run of non-existing file' "
 	echo ignored-file >>.gitignore &&
-	test_must_fail git add --dry-run track-this ignored-file >actual 2>&1 &&
-	echo \"fatal: pathspec 'ignored-file' did not match any files\" | test_cmp - actual
+	test_must_fail git add --dry-run track-this ignored-file >actual 2>&1
+"
+
+test_expect_success C_LOCALE_OUTPUT 'git add --dry-run of an existing file output' "
+	echo \"fatal: pathspec 'ignored-file' did not match any files\" >expect &&
+	test_cmp expect actual
 "
 
 cat >expect.err <<\EOF
@@ -283,7 +287,10 @@ add 'track-this'
 EOF
 
 test_expect_success 'git add --dry-run --ignore-missing of non-existing file' '
-	test_must_fail git add --dry-run --ignore-missing track-this ignored-file >actual.out 2>actual.err &&
+	test_must_fail git add --dry-run --ignore-missing track-this ignored-file >actual.out 2>actual.err
+'
+
+test_expect_success C_LOCALE_OUTPUT 'git add --dry-run --ignore-missing of non-existing file output' '
 	test_cmp expect.out actual.out &&
 	test_cmp expect.err actual.err
 '
diff --git a/t/t4001-diff-rename.sh b/t/t4001-diff-rename.sh
index 71bac83dd..cad85450b 100755
--- a/t/t4001-diff-rename.sh
+++ b/t/t4001-diff-rename.sh
@@ -64,7 +64,7 @@ test_expect_success \
     'validate the output.' \
     'compare_diff_patch current expected'
 
-test_expect_success 'favour same basenames over different ones' '
+test_expect_success C_LOCALE_OUTPUT 'favour same basenames over different ones' '
 	cp path1 another-path &&
 	git add another-path &&
 	git commit -m 1 &&
@@ -73,7 +73,7 @@ test_expect_success 'favour same basenames over different ones' '
 	git mv another-path subdir/path1 &&
 	git status | grep "renamed: .*path1 -> subdir/path1"'
 
-test_expect_success  'favour same basenames even with minor differences' '
+test_expect_success C_LOCALE_OUTPUT  'favour same basenames even with minor differences' '
 	git show HEAD:path1 | sed "s/15/16/" > subdir/path1 &&
 	git status | grep "renamed: .*path1 -> subdir/path1"'
 
diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index 9c663677d..c3cdb5205 100755
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -614,7 +614,7 @@ echo "fatal: --name-only does not make sense" > expect.name-only
 echo "fatal: --name-status does not make sense" > expect.name-status
 echo "fatal: --check does not make sense" > expect.check
 
-test_expect_success 'options no longer allowed for format-patch' '
+test_expect_success C_LOCALE_OUTPUT 'options no longer allowed for format-patch' '
 	test_must_fail git format-patch --name-only 2> output &&
 	test_cmp expect.name-only output &&
 	test_must_fail git format-patch --name-status 2> output &&
diff --git a/t/t5526-fetch-submodules.sh b/t/t5526-fetch-submodules.sh
index a5f458533..8f1237987 100755
--- a/t/t5526-fetch-submodules.sh
+++ b/t/t5526-fetch-submodules.sh
@@ -66,7 +66,10 @@ test_expect_success "fetch --recurse-submodules recurses into submodules" '
 	(
 		cd downstream &&
 		git fetch --recurse-submodules >../actual.out 2>../actual.err
-	) &&
+	)
+'
+
+test_expect_success C_LOCALE_OUTPUT "fetch --recurse-submodules recurses into submodules: output" '
 	test_cmp expect.out actual.out &&
 	test_cmp expect.err actual.err
 '
@@ -95,7 +98,10 @@ test_expect_success "using fetchRecurseSubmodules=true in .gitmodules recurses i
 		cd downstream &&
 		git config -f .gitmodules submodule.submodule.fetchRecurseSubmodules true &&
 		git fetch >../actual.out 2>../actual.err
-	) &&
+	)
+'
+
+test_expect_success C_LOCALE_OUTPUT "using fetchRecurseSubmodules=true in .gitmodules recurses into submodules" '
 	test_cmp expect.out actual.out &&
 	test_cmp expect.err actual.err
 '
@@ -126,7 +132,10 @@ test_expect_success "--recurse-submodules overrides fetchRecurseSubmodules setti
 		git fetch --recurse-submodules >../actual.out 2>../actual.err &&
 		git config --unset -f .gitmodules submodule.submodule.fetchRecurseSubmodules &&
 		git config --unset submodule.submodule.fetchRecurseSubmodules
-	) &&
+	)
+'
+
+test_expect_success C_LOCALE_OUTPUT "--recurse-submodules overrides fetchRecurseSubmodules setting from .git/config: output" '
 	test_cmp expect.out actual.out &&
 	test_cmp expect.err actual.err
 '
@@ -145,13 +154,22 @@ test_expect_success "--dry-run propagates to submodules" '
 	(
 		cd downstream &&
 		git fetch --recurse-submodules --dry-run >../actual.out 2>../actual.err
-	) &&
+	)
+'
+
+test_expect_success C_LOCALE_OUTPUT "--dry-run propagates to submodules: output" '
 	test_cmp expect.out actual.out &&
-	test_cmp expect.err actual.err &&
+	test_cmp expect.err actual.err
+'
+
+test_expect_success "Without --dry-run propagates to submodules" '
 	(
 		cd downstream &&
 		git fetch --recurse-submodules >../actual.out 2>../actual.err
-	) &&
+	)
+'
+
+test_expect_success C_LOCALE_OUTPUT "Without --dry-run propagates to submodules: output" '
 	test_cmp expect.out actual.out &&
 	test_cmp expect.err actual.err
 '
@@ -162,7 +180,10 @@ test_expect_success "recurseSubmodules=true propagates into submodules" '
 		cd downstream &&
 		git config fetch.recurseSubmodules true
 		git fetch >../actual.out 2>../actual.err
-	) &&
+	)
+'
+
+test_expect_success C_LOCALE_OUTPUT "recurseSubmodules=true propagates into submodules: output" '
 	test_cmp expect.out actual.out &&
 	test_cmp expect.err actual.err
 '
@@ -176,7 +197,10 @@ test_expect_success "--recurse-submodules overrides config in submodule" '
 			git config fetch.recurseSubmodules false
 		) &&
 		git fetch --recurse-submodules >../actual.out 2>../actual.err
-	) &&
+	)
+'
+
+test_expect_success C_LOCALE_OUTPUT "--recurse-submodules overrides config in submodule: output" '
 	test_cmp expect.out actual.out &&
 	test_cmp expect.err actual.err
 '
diff --git a/t/t5541-http-push.sh b/t/t5541-http-push.sh
index b0c2a2c3a..0492877d5 100755
--- a/t/t5541-http-push.sh
+++ b/t/t5541-http-push.sh
@@ -128,11 +128,14 @@ test_expect_success 'push fails for non-fast-forward refs unmatched by remote he
 
 	# push master too; this ensures there is at least one '"'push'"' command to
 	# the remote helper and triggers interaction with the helper.
-	test_must_fail git push -v origin +master master:retsam >output 2>&1 &&
+	test_must_fail git push -v origin +master master:retsam >output 2>&1'
 
+test_expect_success 'push fails for non-fast-forward refs unmatched by remote helper: remote output' '
 	grep "^ + [a-f0-9]*\.\.\.[a-f0-9]* *master -> master (forced update)$" output &&
-	grep "^ ! \[rejected\] *master -> retsam (non-fast-forward)$" output &&
+	grep "^ ! \[rejected\] *master -> retsam (non-fast-forward)$" output
+'
 
+test_expect_success C_LOCALE_OUTPUT 'push fails for non-fast-forward refs unmatched by remote helper: our output' '
 	grep "To prevent you from losing history, non-fast-forward updates were rejected" \
 		output
 '
diff --git a/t/t5601-clone.sh b/t/t5601-clone.sh
index 3ca275cc6..a92d145be 100755
--- a/t/t5601-clone.sh
+++ b/t/t5601-clone.sh
@@ -31,7 +31,7 @@ test_expect_success 'clone with excess parameters (2)' '
 
 '
 
-test_expect_success 'output from clone' '
+test_expect_success C_LOCALE_OUTPUT 'output from clone' '
 	rm -fr dst &&
 	git clone -n "file://$(pwd)/src" dst >output &&
 	test $(grep Clon output | wc -l) = 1
diff --git a/t/t6040-tracking-info.sh b/t/t6040-tracking-info.sh
index cb8513264..6c3719141 100755
--- a/t/t6040-tracking-info.sh
+++ b/t/t6040-tracking-info.sh
@@ -42,7 +42,7 @@ b3 behind 1
 b4 ahead 2
 EOF
 
-test_expect_success 'branch -v' '
+test_expect_success C_LOCALE_OUTPUT 'branch -v' '
 	(
 		cd test &&
 		git branch -v
diff --git a/t/t6120-describe.sh b/t/t6120-describe.sh
index 876d1ab74..182699624 100755
--- a/t/t6120-describe.sh
+++ b/t/t6120-describe.sh
@@ -123,7 +123,7 @@ cat - >err.expect <<EOF
 warning: tag 'A' is really 'Q' here
 EOF
 check_describe A-* HEAD
-test_expect_success 'warning was displayed for Q' '
+test_expect_success C_LOCALE_OUTPUT 'warning was displayed for Q' '
 	test_cmp err.expect err.actual
 '
 test_expect_success 'rename tag Q back to A' '
diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh
index 3e7baaf89..1dedfd0c8 100755
--- a/t/t7004-tag.sh
+++ b/t/t7004-tag.sh
@@ -1121,6 +1121,7 @@ test_expect_success \
 '
 
 test_expect_success \
+	C_LOCALE_OUTPUT \
 	'message in editor has initial comment: first line' '
 	# check the first line --- should be empty
 	echo >first.expect &&
diff --git a/t/t7012-skip-worktree-writing.sh b/t/t7012-skip-worktree-writing.sh
index 582d0b54f..14fcb1c7f 100755
--- a/t/t7012-skip-worktree-writing.sh
+++ b/t/t7012-skip-worktree-writing.sh
@@ -124,13 +124,13 @@ cat >expected <<EOF
 Would remove expected
 Would remove result
 EOF
-test_expect_success 'git-clean, absent case' '
+test_expect_success C_LOCALE_OUTPUT 'git-clean, absent case' '
 	setup_absent &&
 	git clean -n > result &&
 	test_cmp expected result
 '
 
-test_expect_success 'git-clean, dirty case' '
+test_expect_success C_LOCALE_OUTPUT 'git-clean, dirty case' '
 	setup_dirty &&
 	git clean -n > result &&
 	test_cmp expected result
diff --git a/t/t7060-wtstatus.sh b/t/t7060-wtstatus.sh
index fcac47259..b4fcc86a1 100755
--- a/t/t7060-wtstatus.sh
+++ b/t/t7060-wtstatus.sh
@@ -38,7 +38,7 @@ cat >expect <<EOF
 no changes added to commit (use "git add" and/or "git commit -a")
 EOF
 
-test_expect_success 'M/D conflict does not segfault' '
+test_expect_success C_LOCALE_OUTPUT 'M/D conflict does not segfault' '
 	mkdir mdconflict &&
 	(
 		cd mdconflict &&
diff --git a/t/t7102-reset.sh b/t/t7102-reset.sh
index b8cf2603a..7be2ff38f 100755
--- a/t/t7102-reset.sh
+++ b/t/t7102-reset.sh
@@ -423,7 +423,7 @@ Unstaged changes after reset:
 M	file2
 EOF
 
-test_expect_success '--mixed refreshes the index' '
+test_expect_success C_LOCALE_OUTPUT '--mixed refreshes the index' '
 	echo 123 >> file2 &&
 	git reset --mixed HEAD > output &&
 	test_cmp expect output
diff --git a/t/t7110-reset-merge.sh b/t/t7110-reset-merge.sh
index 70cdd8e61..b42820ad6 100755
--- a/t/t7110-reset-merge.sh
+++ b/t/t7110-reset-merge.sh
@@ -233,7 +233,7 @@ test_expect_success '"reset --merge HEAD^" is ok with pending merge' '
 #           working index HEAD target         working index HEAD
 #           ----------------------------------------------------
 # file1:     X       U     B    C     --keep   (disallowed)
-test_expect_success '"reset --keep HEAD^" fails with pending merge' '
+test_expect_success C_LOCALE_OUTPUT '"reset --keep HEAD^" fails with pending merge' '
     git reset --hard third &&
     test_must_fail git merge branch1 &&
     test_must_fail git reset --keep HEAD^ 2>err.log &&
@@ -259,7 +259,7 @@ test_expect_success '"reset --merge HEAD" is ok with pending merge' '
 #           working index HEAD target         working index HEAD
 #           ----------------------------------------------------
 # file1:     X       U     B    B     --keep   (disallowed)
-test_expect_success '"reset --keep HEAD" fails with pending merge' '
+test_expect_success C_LOCALE_OUTPUT '"reset --keep HEAD" fails with pending merge' '
     git reset --hard third &&
     test_must_fail git merge branch1 &&
     test_must_fail git reset --keep HEAD 2>err.log &&
@@ -280,7 +280,7 @@ test_expect_success '--merge is ok with added/deleted merge' '
     git diff --exit-code --cached
 '
 
-test_expect_success '--keep fails with added/deleted merge' '
+test_expect_success C_LOCALE_OUTPUT '--keep fails with added/deleted merge' '
     git reset --hard third &&
     rm -f file2 &&
     test_must_fail git merge branch3 &&
diff --git a/t/t7201-co.sh b/t/t7201-co.sh
index 0c002ab69..37ed0931d 100755
--- a/t/t7201-co.sh
+++ b/t/t7201-co.sh
@@ -223,7 +223,7 @@ test_expect_success 'checkout --merge --conflict=diff3 <branch>' '
 	test_cmp two expect
 '
 
-test_expect_success 'checkout to detach HEAD (with advice declined)' '
+test_expect_success C_LOCALE_OUTPUT 'checkout to detach HEAD (with advice declined)' '
 
 	git config advice.detachedHead false &&
 	git checkout -f renamer && git clean -f &&
@@ -242,7 +242,7 @@ test_expect_success 'checkout to detach HEAD (with advice declined)' '
 	fi
 '
 
-test_expect_success 'checkout to detach HEAD' '
+test_expect_success C_LOCALE_OUTPUT 'checkout to detach HEAD' '
 	git config advice.detachedHead true &&
 	git checkout -f renamer && git clean -f &&
 	git checkout renamer^ 2>messages &&
@@ -260,7 +260,7 @@ test_expect_success 'checkout to detach HEAD' '
 	fi
 '
 
-test_expect_success 'checkout to detach HEAD with branchname^' '
+test_expect_success C_LOCALE_OUTPUT 'checkout to detach HEAD with branchname^' '
 
 	git checkout -f master && git clean -f &&
 	git checkout renamer^ &&
@@ -276,7 +276,7 @@ test_expect_success 'checkout to detach HEAD with branchname^' '
 	fi
 '
 
-test_expect_success 'checkout to detach HEAD with :/message' '
+test_expect_success C_LOCALE_OUTPUT 'checkout to detach HEAD with :/message' '
 
 	git checkout -f master && git clean -f &&
 	git checkout ":/Initial" &&
@@ -292,7 +292,7 @@ test_expect_success 'checkout to detach HEAD with :/message' '
 	fi
 '
 
-test_expect_success 'checkout to detach HEAD with HEAD^0' '
+test_expect_success C_LOCALE_OUTPUT 'checkout to detach HEAD with HEAD^0' '
 
 	git checkout -f master && git clean -f &&
 	git checkout HEAD^0 &&
diff --git a/t/t7300-clean.sh b/t/t7300-clean.sh
index 02f67b73b..7e1be4440 100755
--- a/t/t7300-clean.sh
+++ b/t/t7300-clean.sh
@@ -110,7 +110,7 @@ test_expect_success 'git clean with prefix' '
 
 '
 
-test_expect_success 'git clean with relative prefix' '
+test_expect_success C_LOCALE_OUTPUT 'git clean with relative prefix' '
 
 	mkdir -p build docs &&
 	touch a.out src/part3.c docs/manual.txt obj.o build/lib.so &&
@@ -125,7 +125,7 @@ test_expect_success 'git clean with relative prefix' '
 	}
 '
 
-test_expect_success 'git clean with absolute path' '
+test_expect_success C_LOCALE_OUTPUT 'git clean with absolute path' '
 
 	mkdir -p build docs &&
 	touch a.out src/part3.c docs/manual.txt obj.o build/lib.so &&
@@ -377,7 +377,7 @@ test_expect_success 'clean.requireForce and -f' '
 
 '
 
-test_expect_success 'core.excludesfile' '
+test_expect_success C_LOCALE_OUTPUT 'core.excludesfile' '
 
 	echo excludes >excludes &&
 	echo included >included &&
diff --git a/t/t7500-commit.sh b/t/t7500-commit.sh
index 5976f598f..bcdf0847d 100755
--- a/t/t7500-commit.sh
+++ b/t/t7500-commit.sh
@@ -72,7 +72,7 @@ test_expect_success 'adding comments to a template should not commit' '
 	)
 '
 
-test_expect_success 'adding real content to a template should commit' '
+test_expect_success C_LOCALE_OUTPUT 'adding real content to a template should commit' '
 	(
 		test_set_editor "$TEST_DIRECTORY"/t7500/add-content &&
 		git commit --template "$TEMPLATE"
@@ -80,7 +80,7 @@ test_expect_success 'adding real content to a template should commit' '
 	commit_msg_is "template linecommit message"
 '
 
-test_expect_success '-t option should be short for --template' '
+test_expect_success C_LOCALE_OUTPUT '-t option should be short for --template' '
 	echo "short template" > "$TEMPLATE" &&
 	echo "new content" >> foo &&
 	git add foo &&
@@ -91,7 +91,7 @@ test_expect_success '-t option should be short for --template' '
 	commit_msg_is "short templatecommit message"
 '
 
-test_expect_success 'config-specified template should commit' '
+test_expect_success C_LOCALE_OUTPUT 'config-specified template should commit' '
 	echo "new template" > "$TEMPLATE" &&
 	git config commit.template "$TEMPLATE" &&
 	echo "more content" >> foo &&
@@ -290,7 +290,7 @@ test_expect_success 'commit --squash works with -c for same commit' '
 	commit_msg_is "squash! edited commit"
 '
 
-test_expect_success 'commit --squash works with editor' '
+test_expect_success C_LOCALE_OUTPUT 'commit --squash works with editor' '
 	commit_for_rebase_autosquash_setup &&
 	test_set_editor "$TEST_DIRECTORY"/t7500/add-content &&
 	git commit --squash HEAD~1 &&
diff --git a/t/t7501-commit.sh b/t/t7501-commit.sh
index 8980738c7..a76c47419 100755
--- a/t/t7501-commit.sh
+++ b/t/t7501-commit.sh
@@ -14,8 +14,11 @@ test_tick
 test_expect_success \
 	"initial status" \
 	"echo 'bongo bongo' >file &&
-	 git add file && \
-	 git status | grep 'Initial commit'"
+	 git add file"
+
+test_expect_success C_LOCALE_OUTPUT \
+	"Constructing initial commit" \
+	"git status | grep 'Initial commit'"
 
 test_expect_success \
 	"fail initial amend" \
diff --git a/t/t7502-commit.sh b/t/t7502-commit.sh
index 50da034cd..cfb569eab 100755
--- a/t/t7502-commit.sh
+++ b/t/t7502-commit.sh
@@ -22,7 +22,10 @@ check_summary_oneline() {
 	SUMMARY_POSTFIX="$(git log -1 --pretty='format:%h')"
 	echo "[$SUMMARY_PREFIX $SUMMARY_POSTFIX] $2" >exp &&
 
-	test_cmp exp act
+	if test_have_prereq C_LOCALE_OUTPUT
+	then
+		test_cmp exp act
+	fi
 }
 
 test_expect_success 'output summary format' '
@@ -32,7 +35,10 @@ test_expect_success 'output summary format' '
 	check_summary_oneline "root-commit" "initial" &&
 
 	echo change >>file1 &&
-	git add file1 &&
+	git add file1
+'
+
+test_expect_success 'output summary format: root-commit' '
 	check_summary_oneline "" "a change"
 '
 
@@ -215,30 +221,35 @@ test_expect_success 'cleanup commit messages (strip,-F)' '
 
 '
 
-echo "sample
-
-# Please enter the commit message for your changes. Lines starting
-# with '#' will be ignored, and an empty message aborts the commit." >expect
-
 test_expect_success 'cleanup commit messages (strip,-F,-e)' '
 
 	echo >>negative &&
 	{ echo;echo sample;echo; } >text &&
 	git commit -e -F text -a &&
-	head -n 4 .git/COMMIT_EDITMSG >actual &&
-	test_cmp expect actual
+	head -n 4 .git/COMMIT_EDITMSG >actual
+'
+
+echo "sample
+
+# Please enter the commit message for your changes. Lines starting
+# with '#' will be ignored, and an empty message aborts the commit." >expect
 
+test_expect_success C_LOCALE_OUTPUT 'cleanup commit messages (strip,-F,-e): output' '
+	test_cmp expect actual
 '
 
 echo "#
 # Author:    $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
 #" >> expect
 
-test_expect_success 'author different from committer' '
+test_expect_success C_LOCALE_OUTPUT 'author different from committer' '
 
 	echo >>negative &&
 	git commit -e -m "sample"
-	head -n 7 .git/COMMIT_EDITMSG >actual &&
+	head -n 7 .git/COMMIT_EDITMSG >actual
+'
+
+test_expect_success C_LOCALE_OUTPUT 'author different from committer: output' '
 	test_cmp expect actual
 '
 
@@ -248,7 +259,7 @@ rm -f expect.tmp
 echo "# Committer:
 #" >> expect
 
-test_expect_success 'committer is automatic' '
+test_expect_success C_LOCALE_OUTPUT 'committer is automatic' '
 
 	echo >>negative &&
 	(
@@ -258,7 +269,10 @@ test_expect_success 'committer is automatic' '
 		test_must_fail git commit -e -m "sample"
 	) &&
 	head -n 8 .git/COMMIT_EDITMSG |	\
-	sed "s/^# Committer: .*/# Committer:/" >actual &&
+	sed "s/^# Committer: .*/# Committer:/" >actual
+'
+
+test_expect_success C_LOCALE_OUTPUT 'committer is automatic: output' '
 	test_cmp expect actual
 '
 
@@ -370,66 +384,66 @@ try_commit () {
 
 try_commit_status_combo () {
 
-	test_expect_success 'commit' '
+	test_expect_success C_LOCALE_OUTPUT 'commit' '
 		clear_config commit.status &&
 		try_commit "" &&
 		grep "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
-	test_expect_success 'commit' '
+	test_expect_success C_LOCALE_OUTPUT 'commit' '
 		clear_config commit.status &&
 		try_commit "" &&
 		grep "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
-	test_expect_success 'commit --status' '
+	test_expect_success C_LOCALE_OUTPUT 'commit --status' '
 		clear_config commit.status &&
 		try_commit --status &&
 		grep "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
-	test_expect_success 'commit --no-status' '
+	test_expect_success C_LOCALE_OUTPUT 'commit --no-status' '
 		clear_config commit.status &&
 		try_commit --no-status &&
 		! grep "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
-	test_expect_success 'commit with commit.status = yes' '
+	test_expect_success C_LOCALE_OUTPUT 'commit with commit.status = yes' '
 		clear_config commit.status &&
 		git config commit.status yes &&
 		try_commit "" &&
 		grep "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
-	test_expect_success 'commit with commit.status = no' '
+	test_expect_success C_LOCALE_OUTPUT 'commit with commit.status = no' '
 		clear_config commit.status &&
 		git config commit.status no &&
 		try_commit "" &&
 		! grep "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
-	test_expect_success 'commit --status with commit.status = yes' '
+	test_expect_success C_LOCALE_OUTPUT 'commit --status with commit.status = yes' '
 		clear_config commit.status &&
 		git config commit.status yes &&
 		try_commit --status &&
 		grep "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
-	test_expect_success 'commit --no-status with commit.status = yes' '
+	test_expect_success C_LOCALE_OUTPUT 'commit --no-status with commit.status = yes' '
 		clear_config commit.status &&
 		git config commit.status yes &&
 		try_commit --no-status &&
 		! grep "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
-	test_expect_success 'commit --status with commit.status = no' '
+	test_expect_success C_LOCALE_OUTPUT 'commit --status with commit.status = no' '
 		clear_config commit.status &&
 		git config commit.status no &&
 		try_commit --status &&
 		grep "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
-	test_expect_success 'commit --no-status with commit.status = no' '
+	test_expect_success C_LOCALE_OUTPUT 'commit --no-status with commit.status = no' '
 		clear_config commit.status &&
 		git config commit.status no &&
 		try_commit --no-status &&
diff --git a/t/t7506-status-submodule.sh b/t/t7506-status-submodule.sh
index 3d4f85d74..c56733253 100755
--- a/t/t7506-status-submodule.sh
+++ b/t/t7506-status-submodule.sh
@@ -20,17 +20,17 @@ test_expect_success 'setup' '
 	git commit -m "Add submodule sub"
 '
 
-test_expect_success 'status clean' '
+test_expect_success C_LOCALE_OUTPUT 'status clean' '
 	git status >output &&
 	grep "nothing to commit" output
 '
 
-test_expect_success 'commit --dry-run -a clean' '
+test_expect_success C_LOCALE_OUTPUT 'commit --dry-run -a clean' '
 	test_must_fail git commit --dry-run -a >output &&
 	grep "nothing to commit" output
 '
 
-test_expect_success 'status with modified file in submodule' '
+test_expect_success C_LOCALE_OUTPUT 'status with modified file in submodule' '
 	(cd sub && git reset --hard) &&
 	echo "changed" >sub/foo &&
 	git status >output &&
@@ -46,7 +46,7 @@ test_expect_success 'status with modified file in submodule (porcelain)' '
 	EOF
 '
 
-test_expect_success 'status with added file in submodule' '
+test_expect_success C_LOCALE_OUTPUT 'status with added file in submodule' '
 	(cd sub && git reset --hard && echo >foo && git add foo) &&
 	git status >output &&
 	grep "modified:   sub (modified content)" output
@@ -60,14 +60,14 @@ test_expect_success 'status with added file in submodule (porcelain)' '
 	EOF
 '
 
-test_expect_success 'status with untracked file in submodule' '
+test_expect_success C_LOCALE_OUTPUT 'status with untracked file in submodule' '
 	(cd sub && git reset --hard) &&
 	echo "content" >sub/new-file &&
 	git status >output &&
 	grep "modified:   sub (untracked content)" output
 '
 
-test_expect_success 'status -uno with untracked file in submodule' '
+test_expect_success C_LOCALE_OUTPUT 'status -uno with untracked file in submodule' '
 	git status -uno >output &&
 	grep "^nothing to commit" output
 '
@@ -79,7 +79,7 @@ test_expect_success 'status with untracked file in submodule (porcelain)' '
 	EOF
 '
 
-test_expect_success 'status with added and untracked file in submodule' '
+test_expect_success C_LOCALE_OUTPUT 'status with added and untracked file in submodule' '
 	(cd sub && git reset --hard && echo >foo && git add foo) &&
 	echo "content" >sub/new-file &&
 	git status >output &&
@@ -95,7 +95,7 @@ test_expect_success 'status with added and untracked file in submodule (porcelai
 	EOF
 '
 
-test_expect_success 'status with modified file in modified submodule' '
+test_expect_success C_LOCALE_OUTPUT 'status with modified file in modified submodule' '
 	(cd sub && git reset --hard) &&
 	rm sub/new-file &&
 	(cd sub && echo "next change" >foo && git commit -m "next change" foo) &&
@@ -113,7 +113,7 @@ test_expect_success 'status with modified file in modified submodule (porcelain)
 	EOF
 '
 
-test_expect_success 'status with added file in modified submodule' '
+test_expect_success C_LOCALE_OUTPUT 'status with added file in modified submodule' '
 	(cd sub && git reset --hard && echo >foo && git add foo) &&
 	git status >output &&
 	grep "modified:   sub (new commits, modified content)" output
@@ -127,7 +127,7 @@ test_expect_success 'status with added file in modified submodule (porcelain)' '
 	EOF
 '
 
-test_expect_success 'status with untracked file in modified submodule' '
+test_expect_success C_LOCALE_OUTPUT 'status with untracked file in modified submodule' '
 	(cd sub && git reset --hard) &&
 	echo "content" >sub/new-file &&
 	git status >output &&
@@ -141,7 +141,7 @@ test_expect_success 'status with untracked file in modified submodule (porcelain
 	EOF
 '
 
-test_expect_success 'status with added and untracked file in modified submodule' '
+test_expect_success C_LOCALE_OUTPUT 'status with added and untracked file in modified submodule' '
 	(cd sub && git reset --hard && echo >foo && git add foo) &&
 	echo "content" >sub/new-file &&
 	git status >output &&
@@ -167,7 +167,7 @@ test_expect_success 'setup .git file for sub' '
 	 git commit -m "added .real to .gitignore" .gitignore
 '
 
-test_expect_success 'status with added file in modified submodule with .git file' '
+test_expect_success C_LOCALE_OUTPUT 'status with added file in modified submodule with .git file' '
 	(cd sub && git reset --hard && echo >foo && git add foo) &&
 	git status >output &&
 	grep "modified:   sub (new commits, modified content)" output
@@ -177,12 +177,12 @@ test_expect_success 'rm submodule contents' '
 	rm -rf sub/* sub/.git
 '
 
-test_expect_success 'status clean (empty submodule dir)' '
+test_expect_success C_LOCALE_OUTPUT 'status clean (empty submodule dir)' '
 	git status >output &&
 	grep "nothing to commit" output
 '
 
-test_expect_success 'status -a clean (empty submodule dir)' '
+test_expect_success C_LOCALE_OUTPUT 'status -a clean (empty submodule dir)' '
 	test_must_fail git commit --dry-run -a >output &&
 	grep "nothing to commit" output
 '
diff --git a/t/t7508-status.sh b/t/t7508-status.sh
index f1dc5c3b6..a93e70fac 100755
--- a/t/t7508-status.sh
+++ b/t/t7508-status.sh
@@ -55,7 +55,7 @@ test_expect_success 'setup' '
 	git add dir2/added
 '
 
-test_expect_success 'status (1)' '
+test_expect_success C_LOCALE_OUTPUT 'status (1)' '
 
 	grep "use \"git rm --cached <file>\.\.\.\" to unstage" output
 
@@ -85,7 +85,7 @@ cat >expect <<\EOF
 #	untracked
 EOF
 
-test_expect_success 'status (2)' '
+test_expect_success C_LOCALE_OUTPUT 'status (2)' '
 
 	git status >output &&
 	test_cmp expect output
@@ -111,7 +111,7 @@ EOF
 
 git config advice.statusHints false
 
-test_expect_success 'status (advice.statusHints false)' '
+test_expect_success C_LOCALE_OUTPUT 'status (advice.statusHints false)' '
 
 	git status >output &&
 	test_cmp expect output
@@ -157,6 +157,12 @@ test_expect_success 'status -s -b' '
 
 '
 
+test_expect_success 'setup dir3' '
+	mkdir dir3 &&
+	: >dir3/untracked1 &&
+	: >dir3/untracked2
+'
+
 cat >expect <<EOF
 # On branch master
 # Changes to be committed:
@@ -172,16 +178,14 @@ cat >expect <<EOF
 #
 # Untracked files not listed (use -u option to show untracked files)
 EOF
-test_expect_success 'status -uno' '
-	mkdir dir3 &&
-	: >dir3/untracked1 &&
-	: >dir3/untracked2 &&
+test_expect_success C_LOCALE_OUTPUT 'status -uno' '
 	git status -uno >output &&
 	test_cmp expect output
 '
 
-test_expect_success 'status (status.showUntrackedFiles no)' '
+test_expect_success C_LOCALE_OUTPUT 'status (status.showUntrackedFiles no)' '
 	git config status.showuntrackedfiles no
+	test_when_finished "git config --unset status.showuntrackedfiles" &&
 	git status >output &&
 	test_cmp expect output
 '
@@ -197,7 +201,7 @@ cat >expect <<EOF
 # Untracked files not listed
 EOF
 git config advice.statusHints false
-test_expect_success 'status -uno (advice.statusHints false)' '
+test_expect_success C_LOCALE_OUTPUT 'status -uno (advice.statusHints false)' '
 	git status -uno >output &&
 	test_cmp expect output
 '
@@ -208,7 +212,6 @@ cat >expect << EOF
 A  dir2/added
 EOF
 test_expect_success 'status -s -uno' '
-	git config --unset status.showuntrackedfiles
 	git status -s -uno >output &&
 	test_cmp expect output
 '
@@ -243,13 +246,14 @@ cat >expect <<EOF
 #	output
 #	untracked
 EOF
-test_expect_success 'status -unormal' '
+test_expect_success C_LOCALE_OUTPUT 'status -unormal' '
 	git status -unormal >output &&
 	test_cmp expect output
 '
 
-test_expect_success 'status (status.showUntrackedFiles normal)' '
+test_expect_success C_LOCALE_OUTPUT 'status (status.showUntrackedFiles normal)' '
 	git config status.showuntrackedfiles normal
+	test_when_finished "git config --unset status.showuntrackedfiles" &&
 	git status >output &&
 	test_cmp expect output
 '
@@ -266,7 +270,6 @@ A  dir2/added
 ?? untracked
 EOF
 test_expect_success 'status -s -unormal' '
-	git config --unset status.showuntrackedfiles
 	git status -s -unormal >output &&
 	test_cmp expect output
 '
@@ -302,18 +305,21 @@ cat >expect <<EOF
 #	output
 #	untracked
 EOF
-test_expect_success 'status -uall' '
+test_expect_success C_LOCALE_OUTPUT 'status -uall' '
 	git status -uall >output &&
 	test_cmp expect output
 '
-test_expect_success 'status (status.showUntrackedFiles all)' '
+test_expect_success C_LOCALE_OUTPUT 'status (status.showUntrackedFiles all)' '
 	git config status.showuntrackedfiles all
+	test_when_finished "git config --unset status.showuntrackedfiles" &&
 	git status >output &&
-	rm -rf dir3 &&
-	git config --unset status.showuntrackedfiles &&
 	test_cmp expect output
 '
 
+test_expect_success 'teardown dir3' '
+	rm -rf dir3
+'
+
 cat >expect <<EOF
  M dir1/modified
 A  dir2/added
@@ -361,7 +367,7 @@ cat >expect <<\EOF
 #	../untracked
 EOF
 
-test_expect_success 'status with relative paths' '
+test_expect_success C_LOCALE_OUTPUT 'status with relative paths' '
 
 	(cd dir1 && git status) >output &&
 	test_cmp expect output
@@ -434,18 +440,19 @@ cat >expect <<\EOF
 #	<BLUE>untracked<RESET>
 EOF
 
-test_expect_success 'status with color.ui' '
+test_expect_success C_LOCALE_OUTPUT 'status with color.ui' '
 
 	git config color.ui always &&
+	test_when_finished "git config --unset color.ui" &&
 	git status | test_decode_color >output &&
 	test_cmp expect output
 
 '
 
-test_expect_success 'status with color.status' '
+test_expect_success C_LOCALE_OUTPUT 'status with color.status' '
 
-	git config --unset color.ui &&
 	git config color.status always &&
+	test_when_finished "git config --unset color.status" &&
 	git status | test_decode_color >output &&
 	test_cmp expect output
 
@@ -464,7 +471,6 @@ EOF
 
 test_expect_success 'status -s with color.ui' '
 
-	git config --unset color.status &&
 	git config color.ui always &&
 	git status -s | test_decode_color >output &&
 	test_cmp expect output
@@ -564,9 +570,10 @@ cat >expect <<\EOF
 EOF
 
 
-test_expect_success 'status without relative paths' '
+test_expect_success C_LOCALE_OUTPUT 'status without relative paths' '
 
-	git config status.relativePaths false
+	git config status.relativePaths false &&
+	test_when_finished "git config --unset status.relativePaths" &&
 	(cd dir1 && git status) >output &&
 	test_cmp expect output
 
@@ -585,6 +592,8 @@ EOF
 
 test_expect_success 'status -s without relative paths' '
 
+	git config status.relativePaths false &&
+	test_when_finished "git config --unset status.relativePaths" &&
 	(cd dir1 && git status -s) >output &&
 	test_cmp expect output
 
@@ -607,7 +616,10 @@ cat <<EOF >expect
 #	untracked
 EOF
 test_expect_success 'dry-run of partial commit excluding new file in index' '
-	git commit --dry-run dir1/modified >output &&
+	git commit --dry-run dir1/modified >output
+'
+
+test_expect_success C_LOCALE_OUTPUT 'dry-run of partial commit excluding new file in index: output' '
 	test_cmp expect output
 '
 
@@ -655,13 +667,13 @@ cat >expect <<EOF
 #	output
 #	untracked
 EOF
-test_expect_success 'status submodule summary is disabled by default' '
+test_expect_success C_LOCALE_OUTPUT 'status submodule summary is disabled by default' '
 	git status >output &&
 	test_cmp expect output
 '
 
 # we expect the same as the previous test
-test_expect_success 'status --untracked-files=all does not show submodule' '
+test_expect_success C_LOCALE_OUTPUT 'status --untracked-files=all does not show submodule' '
 	git status --untracked-files=all >output &&
 	test_cmp expect output
 '
@@ -719,7 +731,7 @@ cat >expect <<EOF
 #	output
 #	untracked
 EOF
-test_expect_success 'status submodule summary' '
+test_expect_success C_LOCALE_OUTPUT 'status submodule summary' '
 	git config status.submodulesummary 10 &&
 	git status >output &&
 	test_cmp expect output
@@ -760,8 +772,11 @@ cat >expect <<EOF
 #	untracked
 no changes added to commit (use "git add" and/or "git commit -a")
 EOF
-test_expect_success 'status submodule summary (clean submodule)' '
-	git commit -m "commit submodule" &&
+test_expect_success 'status submodule summary (clean submodule): commit' '
+	git commit -m "commit submodule"
+'
+
+test_expect_success C_LOCALE_OUTPUT 'status submodule summary (clean submodule): output' '
 	git config status.submodulesummary 10 &&
 	test_must_fail git commit --dry-run >output &&
 	test_cmp expect output &&
@@ -812,7 +827,7 @@ cat >expect <<EOF
 #	output
 #	untracked
 EOF
-test_expect_success 'commit --dry-run submodule summary (--amend)' '
+test_expect_success C_LOCALE_OUTPUT 'commit --dry-run submodule summary (--amend)' '
 	git config status.submodulesummary 10 &&
 	git commit --dry-run --amend >output &&
 	test_cmp expect output
@@ -867,13 +882,13 @@ cat > expect << EOF
 #	untracked
 EOF
 
-test_expect_success '--ignore-submodules=untracked suppresses submodules with untracked content' '
+test_expect_success C_LOCALE_OUTPUT '--ignore-submodules=untracked suppresses submodules with untracked content' '
 	echo modified > sm/untracked &&
 	git status --ignore-submodules=untracked > output &&
 	test_cmp expect output
 '
 
-test_expect_success '.gitmodules ignore=untracked suppresses submodules with untracked content' '
+test_expect_success C_LOCALE_OUTPUT '.gitmodules ignore=untracked suppresses submodules with untracked content' '
 	git config diff.ignoreSubmodules dirty &&
 	git status >output &&
 	test_cmp expect output &&
@@ -885,7 +900,7 @@ test_expect_success '.gitmodules ignore=untracked suppresses submodules with unt
 	git config --unset diff.ignoreSubmodules
 '
 
-test_expect_success '.git/config ignore=untracked suppresses submodules with untracked content' '
+test_expect_success C_LOCALE_OUTPUT '.git/config ignore=untracked suppresses submodules with untracked content' '
 	git config --add -f .gitmodules submodule.subname.ignore none &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git config --add submodule.subname.ignore untracked &&
@@ -896,12 +911,12 @@ test_expect_success '.git/config ignore=untracked suppresses submodules with unt
 	git config --remove-section -f .gitmodules submodule.subname
 '
 
-test_expect_success '--ignore-submodules=dirty suppresses submodules with untracked content' '
+test_expect_success C_LOCALE_OUTPUT '--ignore-submodules=dirty suppresses submodules with untracked content' '
 	git status --ignore-submodules=dirty > output &&
 	test_cmp expect output
 '
 
-test_expect_success '.gitmodules ignore=dirty suppresses submodules with untracked content' '
+test_expect_success C_LOCALE_OUTPUT '.gitmodules ignore=dirty suppresses submodules with untracked content' '
 	git config diff.ignoreSubmodules dirty &&
 	git status >output &&
 	! test -s actual &&
@@ -913,7 +928,7 @@ test_expect_success '.gitmodules ignore=dirty suppresses submodules with untrack
 	git config --unset diff.ignoreSubmodules
 '
 
-test_expect_success '.git/config ignore=dirty suppresses submodules with untracked content' '
+test_expect_success C_LOCALE_OUTPUT '.git/config ignore=dirty suppresses submodules with untracked content' '
 	git config --add -f .gitmodules submodule.subname.ignore none &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git config --add submodule.subname.ignore dirty &&
@@ -924,13 +939,13 @@ test_expect_success '.git/config ignore=dirty suppresses submodules with untrack
 	git config -f .gitmodules  --remove-section submodule.subname
 '
 
-test_expect_success '--ignore-submodules=dirty suppresses submodules with modified content' '
+test_expect_success C_LOCALE_OUTPUT '--ignore-submodules=dirty suppresses submodules with modified content' '
 	echo modified > sm/foo &&
 	git status --ignore-submodules=dirty > output &&
 	test_cmp expect output
 '
 
-test_expect_success '.gitmodules ignore=dirty suppresses submodules with modified content' '
+test_expect_success C_LOCALE_OUTPUT '.gitmodules ignore=dirty suppresses submodules with modified content' '
 	git config --add -f .gitmodules submodule.subname.ignore dirty &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git status > output &&
@@ -938,7 +953,7 @@ test_expect_success '.gitmodules ignore=dirty suppresses submodules with modifie
 	git config -f .gitmodules  --remove-section submodule.subname
 '
 
-test_expect_success '.git/config ignore=dirty suppresses submodules with modified content' '
+test_expect_success C_LOCALE_OUTPUT '.git/config ignore=dirty suppresses submodules with modified content' '
 	git config --add -f .gitmodules submodule.subname.ignore none &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git config --add submodule.subname.ignore dirty &&
@@ -981,12 +996,12 @@ cat > expect << EOF
 #	untracked
 EOF
 
-test_expect_success "--ignore-submodules=untracked doesn't suppress submodules with modified content" '
+test_expect_success C_LOCALE_OUTPUT "--ignore-submodules=untracked doesn't suppress submodules with modified content" '
 	git status --ignore-submodules=untracked > output &&
 	test_cmp expect output
 '
 
-test_expect_success ".gitmodules ignore=untracked doesn't suppress submodules with modified content" '
+test_expect_success C_LOCALE_OUTPUT ".gitmodules ignore=untracked doesn't suppress submodules with modified content" '
 	git config --add -f .gitmodules submodule.subname.ignore untracked &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git status > output &&
@@ -994,7 +1009,7 @@ test_expect_success ".gitmodules ignore=untracked doesn't suppress submodules wi
 	git config -f .gitmodules  --remove-section submodule.subname
 '
 
-test_expect_success ".git/config ignore=untracked doesn't suppress submodules with modified content" '
+test_expect_success C_LOCALE_OUTPUT ".git/config ignore=untracked doesn't suppress submodules with modified content" '
 	git config --add -f .gitmodules submodule.subname.ignore none &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git config --add submodule.subname.ignore untracked &&
@@ -1043,12 +1058,12 @@ cat > expect << EOF
 #	untracked
 EOF
 
-test_expect_success "--ignore-submodules=untracked doesn't suppress submodule summary" '
+test_expect_success C_LOCALE_OUTPUT "--ignore-submodules=untracked doesn't suppress submodule summary" '
 	git status --ignore-submodules=untracked > output &&
 	test_cmp expect output
 '
 
-test_expect_success ".gitmodules ignore=untracked doesn't suppress submodule summary" '
+test_expect_success C_LOCALE_OUTPUT ".gitmodules ignore=untracked doesn't suppress submodule summary" '
 	git config --add -f .gitmodules submodule.subname.ignore untracked &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git status > output &&
@@ -1056,7 +1071,7 @@ test_expect_success ".gitmodules ignore=untracked doesn't suppress submodule sum
 	git config -f .gitmodules  --remove-section submodule.subname
 '
 
-test_expect_success ".git/config ignore=untracked doesn't suppress submodule summary" '
+test_expect_success C_LOCALE_OUTPUT ".git/config ignore=untracked doesn't suppress submodule summary" '
 	git config --add -f .gitmodules submodule.subname.ignore none &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git config --add submodule.subname.ignore untracked &&
@@ -1067,11 +1082,11 @@ test_expect_success ".git/config ignore=untracked doesn't suppress submodule sum
 	git config -f .gitmodules  --remove-section submodule.subname
 '
 
-test_expect_success "--ignore-submodules=dirty doesn't suppress submodule summary" '
+test_expect_success C_LOCALE_OUTPUT "--ignore-submodules=dirty doesn't suppress submodule summary" '
 	git status --ignore-submodules=dirty > output &&
 	test_cmp expect output
 '
-test_expect_success ".gitmodules ignore=dirty doesn't suppress submodule summary" '
+test_expect_success C_LOCALE_OUTPUT ".gitmodules ignore=dirty doesn't suppress submodule summary" '
 	git config --add -f .gitmodules submodule.subname.ignore dirty &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git status > output &&
@@ -1079,7 +1094,7 @@ test_expect_success ".gitmodules ignore=dirty doesn't suppress submodule summary
 	git config -f .gitmodules  --remove-section submodule.subname
 '
 
-test_expect_success ".git/config ignore=dirty doesn't suppress submodule summary" '
+test_expect_success C_LOCALE_OUTPUT ".git/config ignore=dirty doesn't suppress submodule summary" '
 	git config --add -f .gitmodules submodule.subname.ignore none &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git config --add submodule.subname.ignore dirty &&
@@ -1111,7 +1126,7 @@ cat > expect << EOF
 no changes added to commit (use "git add" and/or "git commit -a")
 EOF
 
-test_expect_success "--ignore-submodules=all suppresses submodule summary" '
+test_expect_success C_LOCALE_OUTPUT "--ignore-submodules=all suppresses submodule summary" '
 	git status --ignore-submodules=all > output &&
 	test_cmp expect output
 '
diff --git a/t/t7600-merge.sh b/t/t7600-merge.sh
index b147a1bd6..87d5d788c 100755
--- a/t/t7600-merge.sh
+++ b/t/t7600-merge.sh
@@ -495,7 +495,7 @@ test_expect_success 'merge fast-forward in a dirty tree' '
 
 test_debug 'git log --graph --decorate --oneline --all'
 
-test_expect_success 'in-index merge' '
+test_expect_success C_LOCALE_OUTPUT 'in-index merge' '
 	git reset --hard c0 &&
 	git merge --no-ff -s resolve c1 >out &&
 	grep "Wonderful." out &&
diff --git a/t/t7607-merge-overwrite.sh b/t/t7607-merge-overwrite.sh
index b54e840ee..ef84f0410 100755
--- a/t/t7607-merge-overwrite.sh
+++ b/t/t7607-merge-overwrite.sh
@@ -150,9 +150,15 @@ test_expect_success 'will not overwrite untracked file on unborn branch' '
 	git rm -fr . &&
 	git checkout --orphan new &&
 	cp important c0.c &&
+	test_must_fail git merge c0 2>out
+'
+
+test_expect_success C_LOCALE_OUTPUT 'will not overwrite untracked file on unborn branch: output' '
+	test_cmp out expect
+'
+
+test_expect_success 'will not overwrite untracked file on unborn branch .git/MERGE_HEAD sanity etc.' '
 	test_when_finished "rm c0.c" &&
-	test_must_fail git merge c0 2>out &&
-	test_cmp out expect &&
 	test_path_is_missing .git/MERGE_HEAD &&
 	test_cmp important c0.c
 '
diff --git a/t/t7611-merge-abort.sh b/t/t7611-merge-abort.sh
index 61890bc89..cdb3f444c 100755
--- a/t/t7611-merge-abort.sh
+++ b/t/t7611-merge-abort.sh
@@ -46,8 +46,14 @@ test_expect_success 'setup' '
 pre_merge_head="$(git rev-parse HEAD)"
 
 test_expect_success 'fails without MERGE_HEAD (unstarted merge)' '
-	test_must_fail git merge --abort 2>output &&
-	grep -q MERGE_HEAD output &&
+	test_must_fail git merge --abort 2>output
+'
+
+test_expect_success C_LOCALE_OUTPUT 'fails without MERGE_HEAD (unstarted merge): fatal output' '
+	grep -q MERGE_HEAD output
+'
+
+test_expect_success 'fails without MERGE_HEAD (unstarted merge): .git/MERGE_HEAD sanity' '
 	test ! -f .git/MERGE_HEAD &&
 	test "$pre_merge_head" = "$(git rev-parse HEAD)"
 '
@@ -57,8 +63,14 @@ test_expect_success 'fails without MERGE_HEAD (completed merge)' '
 	test ! -f .git/MERGE_HEAD &&
 	# Merge successfully completed
 	post_merge_head="$(git rev-parse HEAD)" &&
-	test_must_fail git merge --abort 2>output &&
-	grep -q MERGE_HEAD output &&
+	test_must_fail git merge --abort 2>output
+'
+
+test_expect_success C_LOCALE_OUTPUT 'fails without MERGE_HEAD (completed merge): output' '
+	grep -q MERGE_HEAD output
+'
+
+test_expect_success 'fails without MERGE_HEAD (completed merge): .git/MERGE_HEAD sanity' '
 	test ! -f .git/MERGE_HEAD &&
 	test "$post_merge_head" = "$(git rev-parse HEAD)"
 '
diff --git a/t/t7811-grep-open.sh b/t/t7811-grep-open.sh
index 568a6f2b6..aedf484fe 100755
--- a/t/t7811-grep-open.sh
+++ b/t/t7811-grep-open.sh
@@ -61,7 +61,7 @@ test_expect_success SIMPLEPAGER 'git grep -O' '
 	test_cmp empty out
 '
 
-test_expect_success 'git grep -O --cached' '
+test_expect_success C_LOCALE_OUTPUT 'git grep -O --cached' '
 	test_must_fail git grep --cached -O GREP_PATTERN >out 2>msg &&
 	grep open-files-in-pager msg
 '