> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mage.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Testing

> Making Mage so invincible that nothing can break it, not even itself.

<Frame>
  <p align="center">
    <img alt="Testing" src="https://i.pinimg.com/originals/05/70/56/057056dae3c4c8a5c5426f6c458ba001.gif" />
  </p>
</Frame>

## Errors

### SQL Alchemy migration error

Delete the `test.db` file located in the directory where you are running the
`python3 -m unittest ... --failfast` command.

Example:

```
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 1910, in _execute_context
    self.dialect.do_execute(
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/default.py", line 736, in do_execute
    cursor.execute(statement, parameters)
sqlite3.OperationalError: index ix_pipeline_run_execution_date already exists

...

sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) index ix_pipeline_run_execution_date already exists
[SQL: CREATE INDEX ix_pipeline_run_execution_date ON pipeline_run (execution_date)]
(Background on this error at: https://sqlalche.me/e/14/e3q8)

----------------------------------------------------------------------
Ran 0 tests in 0.038s

FAILED (errors=1)
```