Add test for variant override

This demonstrates that the referenced variant override bug is fixed.

Story: 2000804
Task: 3387

Change-Id: I34d6f735b1ca267d2691608f839deae6e1a111b1

tests/fixtures/config/single-tenant/git/layout-inheritance/zuul.yaml

@@ -0,0 +1,46 @@
+- pipeline:
+    name: check
+    manager: independent
+    source:
+      gerrit
+    trigger:
+      gerrit:
+        - event: patchset-created
+    success:
+      gerrit:
+        verified: 1
+    failure:
+      gerrit:
+        verified: -1
+
+
+- job:
+    name: project-test-irrelevant-starts-empty
+
+- job:
+    name: project-test-irrelevant-starts-full
+    irrelevant-files:
+      - ^README$
+      - ^ignoreme$
+
+- job:
+    name: project-test-nomatch-starts-empty
+
+- job:
+    name: project-test-nomatch-starts-full
+    irrelevant-files:
+      - ^README$
+
+- project:
+    name: org/project
+    check:
+      jobs:
+        - project-test-irrelevant-starts-empty:
+            irrelevant-files:
+              - ^README$
+              - ^ignoreme$
+        - project-test-irrelevant-starts-full
+        - project-test-nomatch-starts-empty:
+            irrelevant-files:
+              - ^README$
+        - project-test-nomatch-starts-full

tests/test_model.py

@@ -265,6 +265,51 @@ class TestJob(BaseTestCase):
         self.assertEqual(job.name, 'python27')
         self.assertEqual(job.timeout, 70)
 
+    def test_inheritance_keeps_matchers(self):
+        layout = model.Layout()
+
+        pipeline = model.Pipeline('gate', layout)
+        layout.addPipeline(pipeline)
+        queue = model.ChangeQueue(pipeline)
+        project = model.Project('project')
+
+        base = configloader.JobParser.fromYaml(layout, {
+            '_source_project': project,
+            'name': 'base',
+            'timeout': 30,
+        })
+        layout.addJob(base)
+        python27 = configloader.JobParser.fromYaml(layout, {
+            '_source_project': project,
+            'name': 'python27',
+            'parent': 'base',
+            'timeout': 40,
+            'irrelevant-files': ['^ignored-file$'],
+        })
+        layout.addJob(python27)
+
+        project_config = configloader.ProjectParser.fromYaml(layout, {
+            'name': 'project',
+            'gate': {
+                'jobs': [
+                    'python27',
+                ]
+            }
+        })
+        layout.addProjectConfig(project_config, update_pipeline=False)
+
+        change = model.Change(project)
+        change.branch = 'master'
+        change.files = ['/COMMIT_MSG', 'ignored-file']
+        item = queue.enqueueChange(change)
+        item.current_build_set.layout = layout
+
+        self.assertTrue(base.changeMatches(change))
+        self.assertFalse(python27.changeMatches(change))
+
+        item.freezeJobTree()
+        self.assertEqual([], item.getJobs())
+
     def test_job_source_project(self):
         layout = model.Layout()
         base_project = model.Project('base_project')

tests/test_scheduler.py

@@ -2241,6 +2241,24 @@ class TestScheduler(ZuulTestCase):
     def test_irrelevant_files_no_match_runs_job(self):
         self._test_irrelevant_files_jobs(should_skip=False)
 
+    def test_inherited_jobs_keep_matchers(self):
+        self.updateConfigLayout('layout-inheritance')
+        self.sched.reconfigure(self.config)
+
+        files = {'ignoreme': 'ignored\n'}
+
+        change = self.fake_gerrit.addFakeChange('org/project',
+                                                'master',
+                                                'test irrelevant-files',
+                                                files=files)
+        self.fake_gerrit.addEvent(change.getPatchsetCreatedEvent(1))
+        self.waitUntilSettled()
+
+        run_jobs = set([build.name for build in self.history])
+
+        self.assertEqual(set(['project-test-nomatch-starts-empty',
+                              'project-test-nomatch-starts-full']), run_jobs)
+
     @skip("Disabled for early v3 development")
     def test_test_config(self):
         "Test that we can test the config"