test appendix

tests/conftest.py

@@ -62,7 +62,11 @@ class LocalRepo(pytest.File):
     def collect(self):
         yield Repo2DockerTest(
             self.fspath.basename, self,
-            args=[self.fspath.dirname, './verify'],
+            args=[
+                '--appendix', 'RUN echo "appendix" > /tmp/appendix',
+                self.fspath.dirname,
+                './verify',
+            ],
         )
 
 

tests/venv/default/verify

@@ -2,5 +2,8 @@
 # Verify that the default just provides a py3 environment with jupyter
 import sys
 
-assert sys.version_info[:2] == (3, 6)
+assert sys.version_info[:2] == (3, 6), sys.version
 import jupyter
+
+with open('/tmp/appendix') as f:
+    assert f.read().strip() == 'appendix'