Add new functional test.

tests/functional/spawn-on-demand/11-abs-suicide.t

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+#!/usr/bin/env bash
+# THIS FILE IS PART OF THE CYLC WORKFLOW ENGINE.
+# Copyright (C) NIWA & British Crown (Met Office) & Contributors.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#-------------------------------------------------------------------------------
+
+# Check that absolute suicide triggers clean up unsatisfied prerequisites.
+# See explanatory comments in the workflow config.
+
+. "$(dirname "$0")/test_header"
+set_test_number 2
+reftest
+exit

tests/functional/spawn-on-demand/11-abs-suicide/flow.cylc

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+# This workflow spawns instances of c (as partially satsified prerequisites)
+# out to the runahead limit before the suicide trigger gets activated. If the
+# suicide trigger cleans up all c instances the scheduler can shut down
+# cleanly. Otherwise it will abort on stall with unsatisfied prerequisites.
+
+[scheduler]
+  [[events]]
+     stall timeout = PT0S
+     abort on stall timeout = True
+     expected task failures = a.1
+
+[scheduling]
+   cycling mode = integer
+   initial cycle point = 1
+   final cycle point = 5
+   runahead limit = P5
+   [[graph]]
+      R1 = "a?"
+      P1 = """
+         a[^]? => c & !x
+         a[^]:fail? => x & !c
+         b => c & x
+      """
+[runtime]
+   [[b,c,x]]
+   [[a]]
+      # Fail after c is spawned out to the runahead limit.
+      script = """
+         cylc__job__poll_grep_workflow_log "spawned c\.5"
+         false
+      """

tests/functional/spawn-on-demand/11-abs-suicide/reference.log

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+Initial point: 1
+Final point: 5
+[a.1] -triggered off []
+[b.1] -triggered off []
+[b.2] -triggered off []
+[b.3] -triggered off []
+[b.4] -triggered off []
+[b.5] -triggered off []
+[x.1] -triggered off ['a.1', 'b.1']
+[x.4] -triggered off ['a.1', 'b.4']
+[x.2] -triggered off ['a.1', 'b.2']
+[x.3] -triggered off ['a.1', 'b.3']
+[x.5] -triggered off ['a.1', 'b.5']