Merge branch 'ab/test-quoting-fix' into maint

Fixes for tests when the source directory has unusual characters in
its path, e.g. whitespaces, double-quotes, etc.
source: <cover-v2-0.3-00000000000-20220630T101646Z-avarab@gmail.com>

* ab/test-quoting-fix:
  config tests: fix harmless but broken "rm -r" cleanup
  test-lib.sh: fix prepend_var() quoting issue
  tests: add missing double quotes to included library paths

t/t1300-config.sh

@@ -2083,12 +2083,13 @@ test_expect_success '--show-scope with --show-origin' '
 '
 
 test_expect_success 'override global and system config' '
-	test_when_finished rm -f "$HOME"/.config/git &&
-
+	test_when_finished rm -f \"\$HOME\"/.gitconfig &&
 	cat >"$HOME"/.gitconfig <<-EOF &&
 	[home]
 		config = true
 	EOF
+
+	test_when_finished rm -rf \"\$HOME\"/.config/git &&
 	mkdir -p "$HOME"/.config/git &&
 	cat >"$HOME"/.config/git/config <<-EOF &&
 	[xdg]

t/t3700-add.sh

@@ -8,7 +8,7 @@ test_description='Test of git add, including the -- option.'
 TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
-. $TEST_DIRECTORY/lib-unique-files.sh
+. "$TEST_DIRECTORY"/lib-unique-files.sh
 
 # Test the file mode "$1" of the file "$2" in the index.
 test_mode_in_index () {

t/t3903-stash.sh

@@ -9,7 +9,7 @@ GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
-. $TEST_DIRECTORY/lib-unique-files.sh
+. "$TEST_DIRECTORY"/lib-unique-files.sh
 
 test_expect_success 'usage on cmd and subcommand invalid option' '
 	test_expect_code 129 git stash --invalid-option 2>usage &&

t/t7609-mergetool--lib.sh

@@ -7,7 +7,7 @@ Testing basic merge tools options'
 . ./test-lib.sh
 
 test_expect_success 'mergetool --tool=vimdiff creates the expected layout' '
-	. $GIT_BUILD_DIR/mergetools/vimdiff &&
+	. "$GIT_BUILD_DIR"/mergetools/vimdiff &&
 	run_unit_tests
 '
 

t/test-lib.sh

@@ -57,14 +57,14 @@ fi
 #
 #	prepend_var VAR : VALUE
 prepend_var () {
-	eval "$1=$3\${$1:+${3:+$2}\$$1}"
+	eval "$1=\"$3\${$1:+${3:+$2}\$$1}\""
 }
 
 # If [AL]SAN is in effect we want to abort so that we notice
 # problems. The GIT_SAN_OPTIONS variable can be used to set common
 # defaults shared between [AL]SAN_OPTIONS.
 prepend_var GIT_SAN_OPTIONS : abort_on_error=1
-prepend_var GIT_SAN_OPTIONS : strip_path_prefix=\"$GIT_BUILD_DIR/\"
+prepend_var GIT_SAN_OPTIONS : strip_path_prefix="$GIT_BUILD_DIR/"
 
 # If we were built with ASAN, it may complain about leaks
 # of program-lifetime variables. Disable it by default to lower