testsuite: add job list nnodes tests

Problem: There is no coverage for job-list and nnodes on
pending jobs.

Add several tests in t2260-job-list.t and t2800-jobs-cmd.t.

Author: chu11

t/t2260-job-list.t

@@ -719,6 +719,22 @@ test_expect_success HAVE_JQ 'flux job list outputs nnodes/ranks/nodelist correct
         echo $obj | jq -e ".nodelist == \"${nodes}\""
 '
 
+# use flux queue to ensure jobs stay in pending state
+test_expect_success HAVE_JQ 'flux job list lists nnodes for pending jobs correctly' '
+        flux queue stop &&
+        id1=$(flux mini submit -N1 hostname | flux job id) &&
+        echo ${id1} >> nnodes.ids &&
+        id2=$(flux mini submit -N3 hostname | flux job id) &&
+        echo ${id2} >> nnodes.ids &&
+        flux job list -s pending | grep ${id1} &&
+        flux job list -s pending | grep ${id2} &&
+        flux job list-ids ${id1} | jq -e ".nnodes == 1" &&
+        flux job list-ids ${id2} | jq -e ".nnodes == 3" &&
+        flux job cancel ${id1} &&
+        flux job cancel ${id2} &&
+        flux queue start
+'
+
 #
 # job success
 #

t/t2800-jobs-cmd.t

@@ -1135,6 +1135,24 @@ test_expect_success HAVE_JQ 'flux jobs works on job with illegal R' '
         test_cmp list_illegal_R.out list_illegal_R.exp
 '
 
+#
+# special tests
+#
+
+# use flux queue to ensure jobs stay in pending state
+test_expect_success HAVE_JQ 'flux jobs lists nnodes for pending jobs correctly' '
+	flux queue stop &&
+	id1=$(flux mini submit -N1 hostname) &&
+	id2=$(flux mini submit -N3 hostname) &&
+	flux jobs -no "{state},{nnodes},{nnodes:h}" ${id1} ${id2}> nnodesP.out &&
+	echo "SCHED,1,1" >> nnodesP.exp &&
+	echo "SCHED,3,3" >> nnodesP.exp &&
+	flux job cancel ${id1} &&
+	flux job cancel ${id2} &&
+	flux queue start &&
+	test_cmp nnodesP.exp nnodesP.out
+'
+
 #
 # leave job cleanup to rc3
 #