morphologyfactory: refactor chunk bdeps exceptions

This creates a small exception hierarchy for failures to validate
stratum morphologies. This is currently a line rather than a tree,
but it will be expanded later in the patch series.

This also adds test coverage for chunk build dependencies being
omitted.

1 files changed, 17 insertions, 0 deletions

diff --git a/morphlib/morphologyfactory_tests.py b/morphlib/morphologyfactory_tests.py
index b1a6a621..7a3dc343 100644
--- a/morphlib/morphologyfactory_tests.py
+++ b/morphlib/morphologyfactory_tests.py
@@ -59,6 +59,18 @@ class FakeLocalRepo(object):
                 "name": "stratum",
                 "kind": "stratum"
             }''',
+        'stratum-no-chunk-bdeps.morph': '''{
+                "name": "stratum-no-chunk-bdeps",
+                "kind": "stratum",
+                "chunks": [
+                    {
+                        "name": "chunk",
+                        "repo": "test:repo",
+                        "ref": "sha1",
+                        "build-mode": "bootstrap"
+                    }
+                ]
+            }''',
         'system.morph': '''{
                 "name": "system",
                 "kind": "system",
@@ -261,3 +273,8 @@ class MorphologyFactoryTests(unittest.TestCase):
         self.assertRaises(morphlib.Error, self.mf.get_morphology,
                           'reponame', 'sha1', 'parse-error.morph')
 
+    def test_fails_on_no_chunk_bdeps(self):
+        self.assertRaises(morphlib.morphologyfactory.NoChunkBuildDependsError,
+                          self.mf.get_morphology, 'reponame', 'sha1',
+                          'stratum-no-chunk-bdeps.morph')
+