sed not working while setting DB prefix

[ScreamingDev]

Seems like you are in macOS

Copying tests/phpunit/test-uninstall.php...
Please enter the prefix that your plugin uses in the database (ex. my_plugin):
wp_
sed: can't read s/myplugin/wp_/: No such file or directory

Please use sed with every parameter (note the -e):

sed -i '' -e "s/myplugin/$prefix/" tests/phpunit/test-uninstall.php

Guessing like sed -i 's/foo/bar/' baz.php differs form OS to OS too much.

[JDGrimes]

Seems like you are in macOS

Guilty as charged. 😄

Would you like to submit a PR?