• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Windows 10
• Poetry version: 1.2.0
• Link of a Gist with the contents of your pyproject.toml file: N/A

Issue

There does not appear to be a way to install a custom plugin locally without involving PyPi. I've tried the following commands:

Within the plugin directory:

poetry self add <plugin name>

Result:

'NoneType' object has no attribute 'startswith'

Within the dist directory after building:

poetry self add <wheel file>

Result:

Could not parse version constraint: <wheel file>

I have been able to work around this by using the system pip to install the plugin, but this is an ugly workaround for an issue that makes testing incredibly difficult.