first add files

lib/sqlalchemy/testing/plugin/bootstrap.py

@@ -0,0 +1,54 @@
+"""
+Bootstrapper for test framework plugins.
+
+The entire rationale for this system is to get the modules in plugin/
+imported without importing all of the supporting library, so that we can
+set up things for testing before coverage starts.
+
+The rationale for all of plugin/ being *in* the supporting library in the
+first place is so that the testing and plugin suite is available to other
+libraries, mainly external SQLAlchemy and Alembic dialects, to make use
+of the same test environment and standard suites available to
+SQLAlchemy/Alembic themselves without the need to ship/install a separate
+package outside of SQLAlchemy.
+
+
+"""
+
+import os
+import sys
+
+
+bootstrap_file = locals()["bootstrap_file"]
+to_bootstrap = locals()["to_bootstrap"]
+
+
+def load_file_as_module(name):
+    path = os.path.join(os.path.dirname(bootstrap_file), "%s.py" % name)
+
+    if sys.version_info >= (3, 5):
+        import importlib.util
+
+        spec = importlib.util.spec_from_file_location(name, path)
+        assert spec is not None
+        assert spec.loader is not None
+        mod = importlib.util.module_from_spec(spec)
+        spec.loader.exec_module(mod)
+    else:
+        import imp
+
+        mod = imp.load_source(name, path)
+
+    return mod
+
+
+if to_bootstrap == "pytest":
+    sys.modules["sqla_plugin_base"] = load_file_as_module("plugin_base")
+    sys.modules["sqla_plugin_base"].bootstrapped_as_sqlalchemy = True
+    if sys.version_info < (3, 0):
+        sys.modules["sqla_reinvent_fixtures"] = load_file_as_module(
+            "reinvent_fixtures_py2k"
+        )
+    sys.modules["sqla_pytestplugin"] = load_file_as_module("pytestplugin")
+else:
+    raise Exception("unknown bootstrap: %s" % to_bootstrap)  # noqa