Flask app.errorhandler not catching exceptions when running with Flask-CLI

I am struggling to get my Flask application to properly handle errors when invoking the application using Flask-CLI.

Here is a simple file called app_runner.py:

import click
from flask import Flask
from flask_cli import FlaskCLI

app = Flask(__name__)
FlaskCLI(app)

@app.errorhandler(Exception)
def catch_error(e):
    print('I wish I saw this')

@app.cli.command(with_appcontext=True)
def test_run():
    with app.app_context():
        print('You will see this')
        raise Exception
        print('You won\'t see this')

I invoke the test_run function via this bash command: FLASK_APP=app_runner.py flask test_run.

I see the first print statement 'You will see this', but I don't see the one that says 'I wish I saw this'.

I hit the Exception, but I never go into the code defined under app.errorhandler. Does anyone have any suggestions?

Error handlers are only for errors raised while handling views. CLI commands are totally separate. If you want to handle an error in a Click command, you need to handle it as you would any Python exception: with a try / except block.