Add scenario (yarn) tests for most of branching and merging

These scenarios test the basics of most of the subcommands the
branch and merge plugin provides. They don't purport to be complete,
but give some indication that things work, and form a basis upon
which further things can be built. Yarn also isn't included in a
Baserock release yet, so we need to keep the cmdtests until Baserock
10 has been released.

The existing cmdtest tests are not modified by this: they are left
intact, until they can analysed in detail for things to be added to
the scenarios. After that, the cmdtest tests will start to go away.

Merging is not covered by these tests: it is not clear how merge should
work, and the current code is known to do the wrong thing in many cases.
Scenarios for merge will be added later.

Building is also not covered. Testing builds well needs some additional,
careful thinking, and that isn't ready for this patch series. It will
be added later.

1 files changed, 9 insertions, 0 deletions

diff --git a/check b/check
index f4391e08..975bfdcb 100755
--- a/check
+++ b/check
@@ -48,6 +48,15 @@ export PYTHONPATH
 
 python setup.py clean check
 
+# Run scenario tests with yarn, if yarn is available.
+
+if command -v yarn > /dev/null
+then
+    yarn -s yarns/morph.shell-lib yarns/*.yarn
+fi
+
+# cmdtest tests.
+
 HOME="$(pwd)/scripts"
 
 cmdtest tests