Bug: MSSQL (SqlServerContainer) ignores some parameters

Describe the bug

When running the SqlServerContainer, in this example with the image mcr.microsoft.com/mssql/server:2022-CU12-ubuntu-22.04, some parameters have no effect on the actual database and lead to failures. It seems like they are just not respected.

To Reproduce

import sqlalchemy
from testcontainers.mssql import SqlServerContainer

def test_showcase_bug():
    with SqlServerContainer(image="mcr.microsoft.com/mssql/server:2022-CU12-ubuntu-22.04", username="dummy") as mssql:
        engine = sqlalchemy.create_engine(mssql.get_connection_url()) # this includes the username "dummy" now.
        print(mssql.get_connection_url())
        with engine.begin() as connection:
            result = connection.execute(sqlalchemy.text("select @@VERSION"))

It loads a while. When looking at the database logs, it prints:

2024-11-14 10:39:43.81 Logon       Error: 18456, Severity: 14, State: 5.
2024-11-14 10:39:43.81 Logon       Login failed for user 'dummy'. Reason: Could not find a login matching the name provided. [CLIENT: 172.17.0.3]

Same thing for other parameters, for example db_name.

Runtime environment

Provide a summary of your runtime environment. Which operating system, python version, and docker version are you using? What is the version of testcontainers-python you are using? You can run the following commands to get the relevant information.

Windows 11
Python 3.11.9
testcontainers 4.8.2
sqlalchemy 2.0.36
pymssql 2.3.1

Thanks for your work!

SqlServerContainer の実装から始め、指定された MSSQL イメージと username、db_name パラメーターを使って例を再現します。これらのパラメーターがコンテナーと接続 URL にどのように渡されるかを追跡し、実行中のデータベースにそれらが適用され、例で認証エラーが発生しなくなったことを確認します。