Error install-wp-tests.sh

I am running the script from Cygwin and I get the following error

`bash bin/install-wp-tests.sh wordpress_test root 'my_pass' localhost latest`

`sed: -e expression #1, char 36: unknown option to s'`

This is the line where the error occurs and the execution ends

`sed $ioption "s:dirname( __FILE__ ) . '/src/':'$WP_CORE_DIR/':" "$WP_TESTS_DIR"/wp-tests-config.php`

Why does this error occur?

regards

Start with bin/install-wp-tests.sh and the sed command that edits wp-tests-config.php, then reproduce the command under Cygwin while checking the values passed to sed. Compare the script's expected environment with Cygwin's behavior; done means the script completes and produces a usable wp-tests-config.php.

Written by the indexing model from the issue text.