This test extracts values from a (key,value) map where multiple entries
can have the same key, and the entries are sorted by key, but not by
value.  The test incorrectly assumes that the values will be sorted as
well, so sort the output.
---
 test/T610-message-property.sh | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/test/T610-message-property.sh b/test/T610-message-property.sh
index 53a0be3b..b8774230 100755
--- a/test/T610-message-property.sh
+++ b/test/T610-message-property.sh
@@ -186,6 +186,18 @@ EXPECT0(notmuch_message_add_property (message, "testkey3", "testvalue3"));
 EXPECT0(notmuch_message_add_property (message, "testkey3", "alice3"));
 print_properties (message, "testkey", FALSE);
 EOF
+# expected: 4 values for testkey1, 3 values for testkey3
+# they are not guaranteed to be sorted, so sort them, leaving the first
+# line '== stdout ==' and the end ('== stderr ==' and whatever error
+# may have been printed) alone
+mv OUTPUT unsorted_OUTPUT
+awk ' NR == 1 { print; next } \
+      NR < 6  { print | "sort"; next } \
+      NR == 6 { close("sort") } \
+      NR < 9  { print | "sort"; next } \
+      NR == 9 { close("sort") } \
+      { print }' unsorted_OUTPUT > OUTPUT
+rm unsorted_OUTPUT
 cat <<'EOF' >EXPECTED
 == stdout ==
 alice
-- 
2.26.1
---
a better version of the previous patch I sent with head/tail replaced by an awk
script by Tomi Ollila which is clearer, and comments added in the test for
clarity.
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