[FIX] make pytest cross-module-runnable

The pytest suite had been partially unified between mergebot and
forwardport but because of session-scoped modules it could not run
across those.

Make the db cache lazy and able to cache multiple databases, and move
the "current required module" to function scoped, this way things
should (and seem to) work properly on runs involving mergebot & fwbot.

Next step: xdist! (need to randomise repo names for that, probably).

conftest.py

@@ -66,7 +66,6 @@ NGROK_CLI = [
 
 def pytest_addoption(parser):
     parser.addoption('--addons-path')
-    parser.addoption('--db', help="DB to run the tests against", default='template_%s' % uuid.uuid4())
     parser.addoption("--no-delete", action="store_true", help="Don't delete repo after a failed run")
 
     parser.addoption(
@@ -79,9 +78,6 @@ def pytest_addoption(parser):
              "blow through the former); localtunnel has no rate-limiting but "
              "the servers are way less reliable")
 
-def pytest_report_header(config):
-    return 'Running against database ' + config.getoption('--db')
-
 @pytest.fixture(scope='session', autouse=True)
 def _set_socket_timeout():
     """ Avoid unlimited wait on standard sockets during tests, this is mostly
@@ -220,26 +216,36 @@ def tunnel(pytestconfig, port):
     else:
         raise ValueError("Unsupported %s tunnel method" % tunnel)
 
+class DbDict(dict):
+    def __init__(self, adpath):
+        super().__init__()
+        self._adpath = adpath
+    def __missing__(self, module):
+        db = 'template_%s' % uuid.uuid4()
+        subprocess.run([
+            'odoo', '--no-http',
+            '--addons-path', self._adpath,
+            '-d', db, '-i', module,
+            '--max-cron-threads', '0',
+            '--stop-after-init'
+        ])
+        self[module] = db
+        return db
+
 @pytest.fixture(scope='session')
-def dbcache(request, module):
+def dbcache(request):
     """ Creates template DB once per run, then just duplicates it before
     starting odoo and running the testcase
     """
-    db = request.config.getoption('--db')
-    subprocess.run([
-        'odoo', '--no-http',
-        '--addons-path', request.config.getoption('--addons-path'),
-        '-d', db, '-i', module,
-        '--max-cron-threads', '0',
-        '--stop-after-init'
-    ], check=True)
-    yield db
-    subprocess.run(['dropdb', db], check=True)
+    dbs = DbDict(request.config.getoption('--addons-path'))
+    yield dbs
+    for db in dbs.values():
+        subprocess.run(['dropdb', db], check=True)
 
 @pytest.fixture
-def db(request, dbcache):
+def db(request, module, dbcache):
     rundb = str(uuid.uuid4())
-    subprocess.run(['createdb', '-T', dbcache, rundb], check=True)
+    subprocess.run(['createdb', '-T', dbcache[module], rundb], check=True)
 
     yield rundb
 

forwardport/tests/conftest.py

@@ -60,7 +60,7 @@ def _cleanup_cache(config, users):
     for login in users.values():
         rmtree(cache_root / login, ignore_errors=True)
 
-@pytest.fixture(scope='session')
+@pytest.fixture()
 def module():
     """ When a test function is (going to be) run, selects the containing
     module (as needing to be installed)

runbot_merge/tests/conftest.py

@@ -1,7 +1,7 @@
 import pytest
 import requests
 
-@pytest.fixture(scope='session')
+@pytest.fixture()
 def module():
     return 'runbot_merge'