Error install-wp-tests.sh

[pruebasft]

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