yaml - How to break up command in CircleCI yml to multiple lines?

I have a CircleCI configuration file that looks like
so:

# Customize test
            commands
test:
 override:
 - docker run -e VAR1=$VAR! -e
            VAR2=$VAR2 -e $VAR3-$VAR3 --entrypoint python my_image:latest -m unittest discover -v -s
            test

How can I break
up the docker run command into multiple lines
like:

docker run \
-e
            VAR1=$VAR! \

-e VAR2=$VAR2 \
-e $VAR3-$VAR3
            \
--entrypoint python my_image:latest \
-m unittest discover -v -s
            test

I've tried using
the | operator for yaml, but CircleCI was unable to parse
because it expects override to be a
list.

# Customize test
            commands
test:

 override: |
 docker run
            \
 -e VAR1=$VAR! \
 -e VAR2=$VAR2 \
 -e $VAR3-$VAR3
            \
 --entrypoint python my_image:latest \
 -m unittest discover -v -s
            test

class="post-text" itemprop="text">

class="normal">Answer

Using this
href="https://stackoverflow.com/questions/3790454/in-yaml-how-do-i-break-a-string-over-multiple-lines">answer
which details the various ways to break up a string over multiple lines in yaml, I was
able to deduce a solution which works
nicely.

Note the use of the
>- operator in the override
section.

test:

            override:
 - >-
 docker run
 -e VAR1=$VAR!

            -e VAR2=$VAR2
 -e $VAR3-$VAR3

 --entrypoint python
            my_image:latest
 -m unittest discover -v -s
            test

This generates a
nice single-line command
of:

docker run -e VAR1=$VAR! -e
            VAR2=$VAR2 -e $VAR3-$VAR3 --entrypoint python my_image:latest -m unittest discover -v -s
            test