implement first test with database access

* Implement a new test class: DBDakTestCase in db_test.py.
* First test: dbtest_fingerprint.py is prefixed with dbtest_ instead of
  test_ because we do not have a test database on franck (yet).
Signed-off-by: NTorsten Werner <twerner@debian.org>

tests/db_test.py

+from base_test import DakTestCase, fixture
+
+from daklib.config import Config
+from daklib.dbconn import DBConn
+
+from sqlalchemy import create_engine
+from sqlalchemy.exc import SADeprecationWarning
+
+import pickle
+import warnings
+
+# suppress some deprecation warnings in squeeze related to sqlalchemy
+warnings.filterwarnings('ignore', \
+    "The SQLAlchemy PostgreSQL dialect has been renamed from 'postgres' to 'postgresql'.*", \
+    SADeprecationWarning)
+
+class DBDakTestCase(DakTestCase):
+    def setUp(self):
+        cnf = Config()
+        if cnf["DB::Host"]:
+            # TCP/IP
+            connstr = "postgres://%s" % cnf["DB::Host"]
+            if cnf["DB::Port"] and cnf["DB::Port"] != "-1":
+                connstr += ":%s" % cnf["DB::Port"]
+            connstr += "/%s" % cnf["DB::Name"]
+        else:
+            # Unix Socket
+            connstr = "postgres:///%s" % cnf["DB::Name"]
+            if cnf["DB::Port"] and cnf["DB::Port"] != "-1":
+                connstr += "?port=%s" % cnf["DB::Port"]
+
+        pickle_file = open(fixture('db-metadata.pkl'), 'r')
+        self.metadata = pickle.load(pickle_file)
+        self.metadata.ddl_listeners = pickle.load(pickle_file)
+        pickle_file.close()
+        self.metadata.bind = create_engine(connstr)
+        self.metadata.create_all()
+        self.session = DBConn().session()
+
+    def tearDown(self):
+        #pass
+        self.session.close()
+        #self.metadata.drop_all()
+

tests/dbtest_all.py

+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import os
+import unittest
+
+def suite():
+    suite = unittest.TestSuite()
+    for _, _, files in os.walk('.'):
+        for name in filter(is_test, files):
+            tests = unittest.defaultTestLoader.loadTestsFromName(name[:-3])
+            suite.addTests(tests)
+    return suite
+
+def is_test(filename):
+    return filename.startswith('dbtest_') and filename.endswith('.py')
+
+if __name__ == "__main__":
+    unittest.main(defaultTest="suite")

tests/dbtest_fingerprint.py

+#!/usr/bin/env python
+
+from db_test import DBDakTestCase
+
+from daklib.dbconn import Fingerprint
+
+import unittest
+
+class FingerprintTestCase(DBDakTestCase):
+    def test_mini(self):
+        fingerprint = Fingerprint()
+        fingerprint.fingerprint = 'deadbeefdeadbeef'
+        self.session.add(fingerprint)
+        self.session.commit
+        fingerprint = self.session.query(Fingerprint).one()
+        self.assertEqual('deadbeefdeadbeef', fingerprint.fingerprint)
+
+if __name__ == '__main__':
+    unittest.main()

tests/fixtures/dak.conf

@@ -22,3 +22,11 @@ Dir
 {
   Root "tests/fixtures/ftp/";
 };
+
+DB
+{
+  Name "test_projectb";
+  Host "";
+  Port -1;
+};
+