Adding upstream version 3.1.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tests/features/db_utils.py

@@ -0,0 +1,78 @@
+from psycopg2 import connect
+from psycopg2.extensions import AsIs
+
+
+def create_db(
+    hostname="localhost", username=None, password=None, dbname=None, port=None
+):
+    """Create test database.
+
+    :param hostname: string
+    :param username: string
+    :param password: string
+    :param dbname: string
+    :param port: int
+    :return:
+
+    """
+    cn = create_cn(hostname, password, username, "postgres", port)
+
+    # ISOLATION_LEVEL_AUTOCOMMIT = 0
+    # Needed for DB creation.
+    cn.set_isolation_level(0)
+
+    with cn.cursor() as cr:
+        cr.execute("drop database if exists %s", (AsIs(dbname),))
+        cr.execute("create database %s", (AsIs(dbname),))
+
+    cn.close()
+
+    cn = create_cn(hostname, password, username, dbname, port)
+    return cn
+
+
+def create_cn(hostname, password, username, dbname, port):
+    """
+    Open connection to database.
+    :param hostname:
+    :param password:
+    :param username:
+    :param dbname: string
+    :return: psycopg2.connection
+    """
+    cn = connect(
+        host=hostname, user=username, database=dbname, password=password, port=port
+    )
+
+    print("Created connection: {0}.".format(cn.dsn))
+    return cn
+
+
+def drop_db(hostname="localhost", username=None, password=None, dbname=None, port=None):
+    """
+    Drop database.
+    :param hostname: string
+    :param username: string
+    :param password: string
+    :param dbname: string
+    """
+    cn = create_cn(hostname, password, username, "postgres", port)
+
+    # ISOLATION_LEVEL_AUTOCOMMIT = 0
+    # Needed for DB drop.
+    cn.set_isolation_level(0)
+
+    with cn.cursor() as cr:
+        cr.execute("drop database if exists %s", (AsIs(dbname),))
+
+    close_cn(cn)
+
+
+def close_cn(cn=None):
+    """
+    Close connection.
+    :param connection: psycopg2.connection
+    """
+    if cn:
+        cn.close()
+        print("Closed connection: {0}.".format(cn.dsn))