IntegrationTest#test_launch_mode_with_full_bundle fails locally for Ruby 3.1

[andyw8]

Change .ruby-version to 3.1.4, run dev up, then:

% bundle exec ruby -Itest /Users/andyw8/src/github.com/Shopify/ruby-lsp/test/integration_test.rb --name "/^IntegrationTest(#|::)/"

# Running tests with run options --name "/^IntegrationTest(#|::)/" --seed 14559:

..S...S.E..

Finished tests in 14.330950s, 0.7676 tests/s, 32.5868 assertions/s.


Skipped:
IntegrationTest#test_ruby_lsp_doctor_works [/Users/andyw8/.gem/ruby/3.1.4/gems/minitest-5.25.1/lib/minitest/assertions.rb:833]:
CI only

Skipped:
IntegrationTest#test_ruby_lsp_check_works [/Users/andyw8/.gem/ruby/3.1.4/gems/minitest-5.25.1/lib/minitest/assertions.rb:833]:
CI only

Error:
IntegrationTest#test_launch_mode_with_full_bundle:
NoMethodError: undefined method `[]' for nil:NilClass

    length = headers[/Content-Length: (\d+)/i, 1].to_i
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    test/integration_test.rb:320:in `read_message'
    test/integration_test.rb:286:in `launch'
    test/integration_test.rb:218:in `block (2 levels) in test_launch_mode_with_full_bundle'
    /Users/andyw8/.gem/ruby/3.1.4/gems/bundler-2.6.2/lib/bundler.rb:411:in `block in with_unbundled_env'
    /Users/andyw8/.gem/ruby/3.1.4/gems/bundler-2.6.2/lib/bundler.rb:716:in `with_env'
    /Users/andyw8/.gem/ruby/3.1.4/gems/bundler-2.6.2/lib/bundler.rb:411:in `with_unbundled_env'
    test/integration_test.rb:217:in `block in test_launch_mode_with_full_bundle'
    test/integration_test.rb:327:in `block (2 levels) in in_temp_dir'
    test/integration_test.rb:326:in `chdir'
    test/integration_test.rb:326:in `block in in_temp_dir'
    /opt/rubies/3.1.4/lib/ruby/3.1.0/tmpdir.rb:96:in `mktmpdir'
    test/integration_test.rb:325:in `in_temp_dir'
    test/integration_test.rb:193:in `test_launch_mode_with_full_bundle'

[andyw8]

@alexcrocha mind checking if you also see this failing locally?

[alexcrocha]

I confirm this is failing locally on 3.1.4