Add means to Duplicate connections from UI

tests/www/views/test_views_connection.py

@@ -54,3 +54,46 @@ def test_prefill_form_null_extra():
 
     cmv = ConnectionModelView()
     cmv.prefill_form(form=mock_form, pk=1)
+
+
+def test_duplicate_connection(admin_client):
+    """Test Duplicate multiple connection with suffix"""
+    conn1 = Connection(
+        conn_id='test_duplicate_gcp_connection',
+        conn_type='Google Cloud',
+        description='Google Cloud Connection',
+    )
+    conn2 = Connection(
+        conn_id='test_duplicate_mysql_connection',
+        conn_type='FTP',
+        description='MongoDB2',
+        host='localhost',
+        schema='airflow',
+        port=3306,
+    )
+    conn3 = Connection(
+        conn_id='test_duplicate_postgres_connection_copy1',
+        conn_type='FTP',
+        description='Postgres',
+        host='localhost',
+        schema='airflow',
+        port=3306,
+    )
+    with create_session() as session:
+        session.query(Connection).delete()
+        session.add_all([conn1, conn2, conn3])
+        session.commit()
+
+    mock_form = mock.Mock()
+    mock_form.data = {"action": "mulduplicate", "rowid": [conn1.id, conn3.id]}
+    resp = admin_client.post('/connection/action_post', data=mock_form.data, follow_redirects=True)
+    expected_result = {
+        'test_duplicate_gcp_connection',
+        'test_duplicate_gcp_connection_copy1',
+        'test_duplicate_mysql_connection',
+        'test_duplicate_postgres_connection_copy1',
+        'test_duplicate_postgres_connection_copy2',
+    }
+    response = {conn[0] for conn in session.query(Connection.conn_id).all()}
+    assert resp.status_code == 200
+    assert expected_result == response