Test that custom functions are live-reloaded

Change-Id: Ie9cc0869729f3304b281e1700912f43d7e3ac70d

tests/fixtures/custom_functions_live_reconfiguration_functions.py

@@ -0,0 +1,2 @@
+def select_debian_node(item, params):
+    params['ZUUL_NODE'] = 'wheezy'

tests/fixtures/layout-live-reconfiguration-functions.yaml

@@ -0,0 +1,34 @@
+includes:
+  - python-file: custom_functions_live_reconfiguration_functions.py
+
+pipelines:
+  - name: gate
+    manager: DependentPipelineManager
+    failure-message: Build failed.  For information on how to proceed, see http://wiki.example.org/Test_Failures
+    trigger:
+      gerrit:
+        - event: comment-added
+          approval:
+            - approved: 1
+    success:
+      verified: 2
+      submit: true
+    failure:
+      verified: -2
+    start:
+      verified: 0
+    precedence: high
+
+jobs:
+  - name: ^.*-merge$
+    failure-message: Unable to merge change
+    hold-following-changes: true
+  - name: node-project-test1
+    parameter-function: select_debian_node
+
+projects:
+  - name: org/node-project
+    gate:
+      - node-project-merge:
+        - node-project-test1
+        - node-project-test2

tests/test_scheduler.py

@@ -2467,6 +2467,36 @@ class TestScheduler(testtools.TestCase):
         self.assertEqual(A.data['status'], 'MERGED')
         self.assertEqual(A.reported, 2)
 
+    def test_live_reconfiguration_functions(self):
+        "Test live reconfiguration with a custom function"
+        self.worker.registerFunction('build:node-project-test1:debian')
+        self.worker.registerFunction('build:node-project-test1:wheezy')
+        A = self.fake_gerrit.addFakeChange('org/node-project', 'master', 'A')
+        A.addApproval('CRVW', 2)
+        self.fake_gerrit.addEvent(A.addApproval('APRV', 1))
+        self.waitUntilSettled()
+
+        self.assertIsNone(self.getJobFromHistory('node-project-merge').node)
+        self.assertEqual(self.getJobFromHistory('node-project-test1').node,
+                         'debian')
+        self.assertIsNone(self.getJobFromHistory('node-project-test2').node)
+
+        self.config.set('zuul', 'layout_config',
+                        'tests/fixtures/layout-live-'
+                        'reconfiguration-functions.yaml')
+        self.sched.reconfigure(self.config)
+        self.worker.build_history = []
+
+        B = self.fake_gerrit.addFakeChange('org/node-project', 'master', 'B')
+        B.addApproval('CRVW', 2)
+        self.fake_gerrit.addEvent(B.addApproval('APRV', 1))
+        self.waitUntilSettled()
+
+        self.assertIsNone(self.getJobFromHistory('node-project-merge').node)
+        self.assertEqual(self.getJobFromHistory('node-project-test1').node,
+                         'wheezy')
+        self.assertIsNone(self.getJobFromHistory('node-project-test2').node)
+
     def test_delayed_repo_init(self):
         self.config.set('zuul', 'layout_config',
                         'tests/fixtures/layout-delayed-repo-init.yaml')