How can I use pytest to run tests on code in a remote Databricks workspace using the Databricks extension for Visual Studio Code?
To run tests on code in a remote Databricks workspace using the Databricks extension for Visual Studio Code, you can follow these steps:

1. Create a Python file with your tests. This file should contain a pytest fixture that makes the cluster’s SparkSession available to the tests. You can add your own tests to this file as needed.

Here's an example of what the Python file might look like:
```python
from pyspark.sql import SparkSession
import pytest

@pytest.fixture
def spark() -> SparkSession:
    # Create a SparkSession on the cluster in the remote Databricks workspace.
    return SparkSession.builder.getOrCreate()

def test_spark(spark):
    # Add your tests here.
    # For example, here's a test that checks whether the specified cell in the
    # specified table contains the specified value.
    spark.sql('USE default')
    data = spark.sql('SELECT * FROM diamonds')
    assert data.collect()[0][2] == 'Ideal'
```
2. Create a Python file that instructs pytest to run your tests from the previous step. This file should switch to the root directory and run pytest from there, using the arguments supplied by your custom run configuration in your Visual Studio Code project.

Here's an example of what the Python file might look like:
```python
import pytest
import os
import sys

# Run all tests in the connected directory in the remote Databricks workspace.
# By default, pytest searches through all files with filenames ending with
# "_test.py" for tests. Within each of these files, pytest runs each function
# with a function name beginning with "test_".

# Get the path to the directory for this file in the workspace.
dir_root = os.path.dirname(os.path.realpath(__file__))

# Switch to the root directory.
os.chdir(dir_root)

# Skip writing.pyc files to the bytecode cache on the cluster.
sys.dont_write_bytecode = True

# Now run pytest from the root directory, using the arguments that are supplied
# by your custom run configuration in your Visual Studio Code project.
retcode = pytest.main(sys.argv[1:])
```
By following these steps, you can use pytest to run tests on code in a remote Databricks workspace using the Databricks extension for Visual Studio Code.