job-list: add unit test for missing job duration

Problem: JobspecV1 requires attributes.system.duration to be set,
but a unit test for this is missing in job-list.

Add a unit test for this coverage.

Author: chu11

src/modules/job-list/Makefile.am

@@ -97,6 +97,7 @@ EXTRA_DIST = \
 	test/jobspec/queue_specified.jobspec \
 	test/jobspec/cwd_not_specified.jobspec \
 	test/jobspec/invalid_attributes_system_job.jobspec \
+	test/jobspec/invalid_attributes_system_missing_duration.jobspec \
 	test/jobspec/invalid_command_array.jobspec \
 	test/jobspec/invalid_command_string.jobspec \
 	test/jobspec/invalid_json.jobspec \

src/modules/job-list/test/job_data.c

@@ -29,6 +29,7 @@ struct test_jobspec_corner_case {
     { TEST_SRCDIR "/jobspec/invalid_json.jobspec", -1 },
     { TEST_SRCDIR "/jobspec/missing_attributes.jobspec", -1 },
     { TEST_SRCDIR "/jobspec/invalid_attributes_system_job.jobspec", -1 },
+    { TEST_SRCDIR "/jobspec/invalid_attributes_system_missing_duration.jobspec", -1 },
     { TEST_SRCDIR "/jobspec/missing_tasks.jobspec", -1 },
     { TEST_SRCDIR "/jobspec/invalid_tasks_array.jobspec", -1 },
     { TEST_SRCDIR "/jobspec/invalid_tasks_missing_command.jobspec", -1 },

src/modules/job-list/test/jobspec/invalid_attributes_system_missing_duration.jobspec

@@ -0,0 +1,39 @@
+{
+  "resources": [
+    {
+      "type": "node",
+      "count": 1,
+      "exclusive": true,
+      "with": [
+        {
+          "type": "slot",
+          "count": 1,
+          "with": [
+            {
+              "type": "core",
+              "count": 1
+            }
+          ],
+          "label": "task"
+        }
+      ]
+    }
+  ],
+  "tasks": [
+    {
+      "command": [
+        "hostname"
+      ],
+      "slot": "task",
+      "count": {
+        "per_slot": 1
+      }
+    }
+  ],
+  "attributes": {
+    "system": {
+      "cwd": "/tmp/job"
+    }
+  },
+  "version": 1
+}