[wip] Fix travis builds

[kolen]

Fix failing Travis builds

• Integrate [CI] Test against new Ruby 2.5 #645 which adds Ruby 2.5 and omits minor version numbers
• rubinius: Update Rubinius to 3.99 (Missing or uninitialized constant: Bundler::Deprecate when installing a bundle with Rubinius rubygems/bundler#6163): Missing or uninitialized constant: Bundler::Deprecate
• rubinius: File does not exist: minitest/unit (builtin test/unit which is compatibility layer over minitest is removed in 3.100)
• ruby 1.9.3: Limit version of Rake (development dependency) to < 12.3 (12.3 no longer supports Ruby 1.9 which we target)
• ruby HEAD: cannot load such file -- bundler/dep_proxy bundle command failing due to RubyGems bug travis-ci/travis-ci#8969 — allowed build to fail, error is still there

[kolen]

For some reason, require 'test/unit' in test_helper under Rubinius loads test-unit from standard lib (rubinius/3.99/codedb/source/rubysl/test/unit.rb), not from test-unit gem. Stdlib's Test::Unit delegates to minitest and breaks.

Stacktrace from my machine:

/usr/local/opt/rubinius/lib/rubinius/3.99/codedb/source/rubygems/core_ext/kernel_require.rb:135:in `require'
/usr/local/opt/rubinius/lib/rubinius/3.99/codedb/source/rubysl/test/unit/unit.rb:1:in `__script__'
/usr/local/opt/rubinius/lib/rubinius/3.99/codedb/source/rubygems/core_ext/kernel_require.rb:59:in `require'
/usr/local/opt/rubinius/lib/rubinius/3.99/codedb/source/rubysl/test/unit.rb:1:in `__script__'
/usr/local/opt/rubinius/lib/rubinius/3.99/codedb/source/rubygems/core_ext/kernel_require.rb:59:in `require'
/usr/local/opt/rubinius/lib/rubinius/3.99/codedb/source/test/unit.rb:1:in `__script__'
/usr/local/opt/rubinius/lib/rubinius/3.99/codedb/source/rubygems/core_ext/kernel_require.rb:59:in `require'
/Users/kolen/items/redcarpet/test/test_helper.rb:5:in `__script__'
/usr/local/opt/rubinius/lib/rubinius/3.99/codedb/source/rubygems/core_ext/kernel_require.rb:59:in `require'
/Users/kolen/items/redcarpet/test/custom_render_test.rb:2:in `__script__'
/usr/local/opt/rubinius/lib/rubinius/3.99/codedb/source/rubygems/core_ext/kernel_require.rb:59:in `require'
/usr/local/opt/rubinius/lib/rubinius/3.99/gems/gems/rake-12.2.1/lib/rake/rake_test_loader.rb:17:in `__script__'
/usr/local/opt/rubinius/lib/rubinius/3.99/gems/gems/rake-12.2.1/lib/rake/rake_test_loader.rb:5:in `__script__'

It loads rubinius/3.99/codedb/source/test/unit.rb which contains single line:

require "rubysl/test/unit"

In load path, rubinius/3.99/gems/gems/test-unit-3.2.7/lib is before rubinius/lib/rubinius/3.99/codedb/source.

[kolen]

Maybe we should allow ruby-head to fail? It's unstable version and it depends on time when build started (it takes latest commit, not fixed version).

matrix:
  allow_failures:
  - rvm: ruby-head

(Also AFAIK rvm can install head version of rbx too, we can try to build against it but allow for failure)

[mattr-]

Maybe we should allow ruby-head to fail?

we should definitely allow ruby-head to fail.

[kolen]

Made ruby-head allowed to fail. Now tests pass on CI. That error is still there in current head version (BTW, tests pass on my machine on ruby-head).

(Also AFAIK rvm can install head version of rbx too, we can try to build against it but allow for failure)

Seems that it is not available on Travis so I didn't add rbx-head (it requires building from sources non-standard way).

[mattr-]

🙌 Thanks for fixing this!