test: replace $PWD with YYY in emacs & emacs-show tests

When executed command line is written to *Notmuch errors* buffer,
shell-quote-argument will backslash-escape any char that is not in
"POSIX filename characters" (i.e. matching "[^-0-9a-zA-Z_./\n]").

Currently in two emacs tests shell has expanded $PWD as part of
emacs variable, which will later be fed to #'shell-quote-argument
and finally written to ERROR file. If $PWD contained non-POSIX
filename characters, data in ERROR file will not match $PWD when
later comparing in shell. Therefore, in these two particular cases
the escaped $PWD is replaced with YYY in ERROR file and expected
content is adjusted accordingly.

test/emacs

@@ -881,15 +881,16 @@ test_emacs "(let ((notmuch-command \"$PWD/notmuch_fail\"))
 	       (with-current-buffer \"*Notmuch errors*\"
 		  (test-output \"ERROR\"))
 	       (test-output))"
-sed -i -e 's/^\[.*\]$/[XXX]/' ERROR
-test_expect_equal "$(cat OUTPUT; echo ---; cat MESSAGES; echo ---; cat ERROR)" "\
+
+test_expect_equal "$(notmuch_emacs_error_sanitize notmuch_fail OUTPUT MESSAGES ERROR)" "\
+=== OUTPUT ===
 End of search results.
----
-$PWD/notmuch_fail exited with status 1 (see *Notmuch errors* for more details)
----
+=== MESSAGES ===
+YYY/notmuch_fail exited with status 1 (see *Notmuch errors* for more details)
+=== ERROR ===
 [XXX]
-$PWD/notmuch_fail exited with status 1
-command: $PWD/notmuch_fail search --format\=sexp --format-version\=2 --sort\=newest-first tag\:inbox
+YYY/notmuch_fail exited with status 1
+command: YYY/notmuch_fail search --format\=sexp --format-version\=2 --sort\=newest-first tag\:inbox
 exit status: 1"
 
 test_begin_subtest "Search handles subprocess warnings"

test/emacs-show

@@ -181,14 +181,14 @@ test_emacs "(let ((notmuch-command \"$PWD/notmuch_fail\"))
 	       (with-current-buffer \"*Notmuch errors*\"
 		  (test-output \"ERROR\"))
 	       (test-output))"
-sed -i -e 's/^\[.*\]$/[XXX]/' ERROR
-test_expect_equal "$(cat OUTPUT; echo ---; cat MESSAGES; echo ---; cat ERROR)" "\
----
+test_expect_equal "$(notmuch_emacs_error_sanitize notmuch_fail OUTPUT MESSAGES ERROR)" "\
+=== OUTPUT ===
+=== MESSAGES ===
 This is an error (see *Notmuch errors* for more details)
----
+=== ERROR ===
 [XXX]
 This is an error
-command: $PWD/notmuch_fail show --format\\=sexp --format-version\\=1 --exclude\\=false \\' \\* \\'
+command: YYY/notmuch_fail show --format\\=sexp --format-version\\=1 --exclude\\=false \\' \\* \\'
 exit status: 1
 stderr:
 This is an error

test/test-lib.sh

@@ -628,6 +628,17 @@ notmuch_json_show_sanitize ()
 	-e 's|"filename": "/[^"]*",|"filename": "YYYYY",|g'
 }
 
+notmuch_emacs_error_sanitize ()
+{
+    local command=$1
+    shift
+    for file in "$@"; do
+	echo "=== $file ==="
+	cat "$file"
+    done | sed  \
+	-e 's/^\[.*\]$/[XXX]/' \
+	-e "s|^\(command: \)\{0,1\}/.*/$command|\1YYY/$command|"
+}
 # End of notmuch helper functions
 
 # Use test_set_prereq to tell that a particular prerequisite is available.