Some time ago I came across a weird error when trying to run RSpec test suite involving PhantomJS in Vagrant. Here’s the solution.
The error in question is:
The detector #{@detector} failed to detect the version of the executable at '#{executable_path}
Here is the snipped of the failures:
139.3) Failure/Error:
raw_version || raise(ArgumentError,
"The detector #{@detector} failed to detect the" +
"version of the executable at '#{executable_path}'")
ArgumentError:
The detector <struct Cliver::Detector command_arg=nil, version_pattern=nil> failed to detect theversion of the executable at '/usr/bin/phantomjs'
140) Document details management when visiting index secret_admin can see it
Got 0 failures and 3 other errors:
140.1) Failure/Error: visit new_user_session_path
ArgumentError:
The detector <struct Cliver::Detector command_arg=nil, version_pattern=nil> failed to detect theversion of the executable at '/usr/bin/phantomjs'
What helped me to fix it in the end was setting the QT_QPA_PLATFORM variable to offscreen:
vagrant$ QT_QPA_PLATFORM=offscreen rspec
You should also be able to pass the -platform offscreen option to the PhantomJS executable.
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