fixup! Expose basic api for testing external plugins.

tests/artifactcache/junctions.py

@@ -8,8 +8,6 @@ from buildstream.plugintestutils import cli
 from tests.testutils import create_artifact_share
 
 
-
-
 DATA_DIR = os.path.join(
     os.path.dirname(os.path.realpath(__file__)),
     "junctions",

tests/frontend/cross_junction_workspace.py

@@ -4,6 +4,7 @@ from buildstream import _yaml
 
 from tests.testutils import create_repo
 
+
 def prepare_junction_project(cli, tmpdir):
     main_project = tmpdir.join("main")
     sub_project = tmpdir.join("sub")