Reproducible test case for issue 707

modules/mysql/tests/conftest.py

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+from pathlib import Path
+import pytest
+import docker
+
+
+# build a custom MySQL image
+@pytest.fixture(scope="session")
+def mysql_custom_image() -> str:
+    tag = "mysql-custom:8.0"
+    client = docker.from_env()
+    DOCKERFILE_PATH = (Path(__file__).parent / "seeds").absolute().as_posix()
+    image, _ = client.images.build(path=DOCKERFILE_PATH, tag=tag)
+    return tag

modules/mysql/tests/seeds/Dockerfile

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+#
+# custom mysql image
+#
+ARG MYSQL_VERSION="8.0"
+FROM mysql:${MYSQL_VERSION} as builder
+
+# That file does the DB initialization but also runs mysql daemon, by removing the last line it will only init
+RUN ["sed", "-i", "s/exec \"$@\"/echo \"not running $@\"/", "/usr/local/bin/docker-entrypoint.sh"]
+
+# needed for intialization
+ENV MYSQL_ROOT_PASSWORD=root
+ENV MYSQL_DATABASE=test MYSQL_USER=test MYSQL_PASSWORD=test
+
+COPY *.sql /docker-entrypoint-initdb.d/
+
+# Need to change the datadir to something other than /var/lib/mysql because the parent docker file defines it as a volume.
+# https://docs.docker.com/engine/reference/builder/#volume :
+#       Changing the volume from within the Dockerfile: If any build steps change the data within the volume after
+#       it has been declared, those changes will be discarded.
+RUN ["/usr/local/bin/docker-entrypoint.sh", "mysqld", "--datadir", "/initialized-db" ]
+
+#
+# create final container
+#
+FROM mysql:${MYSQL_VERSION}
+
+# copy datadir from builder
+COPY --from=builder /initialized-db /var/lib/mysql

modules/mysql/tests/test_mysql_custom_image.py

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+import pytest
+import re
+import sqlalchemy
+
+from testcontainers.core.utils import is_arm
+from testcontainers.mysql import MySqlContainer
+
+# imports for issue 707
+from testcontainers.core.waiting_utils import wait_for_logs
+from types import MethodType
+
+
+# Testcontainers-Python 4.8.2 / main branch: This method gets the following error:
+# E   TimeoutError: Container did not emit logs satisfying predicate in 120.000 seconds
+@pytest.mark.skipif(is_arm(), reason="mysql container not available for ARM")
+def test_docker_run_mysql_8_custom(mysql_custom_image):
+    config = MySqlContainer(mysql_custom_image)
+    with config as mysql:
+        engine = sqlalchemy.create_engine(mysql.get_connection_url())
+        with engine.begin() as connection:
+            result = connection.execute(sqlalchemy.text("select * from stuff"))
+            assert len(list(result)) == 4, "Should have gotten all the stuff"
+
+
+# Testcontainers-Python 4.8.2 / main branch: This method works
+@pytest.mark.skipif(is_arm(), reason="mysql container not available for ARM")
+def test_docker_run_mysql_8_custom_overwrite_connect_method(mysql_custom_image):
+    config = MySqlContainer(mysql_custom_image)
+
+    # 20241025 patch the _connect method to change the wait_for_logs regex
+    def _connect(self) -> None:
+        wait_for_logs(
+            self,
+            re.compile(".* ready for connections.* ready for connections.*", flags=re.DOTALL | re.MULTILINE).search,
+        )
+
+    config._connect = MethodType(_connect, config)
+
+    with config as mysql:
+        mysql_url = mysql.get_connection_url()
+        engine = sqlalchemy.create_engine(mysql_url)
+        with engine.begin() as connection:
+            result = connection.execute(sqlalchemy.text("select * from stuff"))
+            assert len(list(result)) == 4, "Should have gotten all the stuff"