[changelog skip] Run tests for Deivid rodriguez PRs (#1182)

* Allow running specs with RSpec 3

The `-s` alias for the documentation formatter was removed in RSpec 3.
See
rspec/rspec-core@b8d55ef.

* Allow configuring `HATCHET_BUILDPACK_BASE`

So that specs can be run on forks.

* Allow `rspec --only-failures` to work by default

It's useful when focusing on fixing a failing test run, since it only
runs currently failing specs.

Co-authored-by: David Rodríguez <[email protected]>

.gitignore

@@ -8,3 +8,4 @@ buildpacks/*
 .anvil/
 tmp/*.log
 log/*.log
+spec/examples.txt

Rakefile

@@ -126,7 +126,7 @@ begin
 
   desc "Run specs"
   RSpec::Core::RakeTask.new(:spec) do |t|
-    t.rspec_opts = %w(-fs --color)
+    t.rspec_opts = %w(-fd --color)
     #t.ruby_opts  = %w(-w)
   end
   task :default => :spec

spec/spec_helper.rb

@@ -7,7 +7,7 @@
 require 'language_pack'
 require 'language_pack/shell_helpers'
 
-ENV["HATCHET_BUILDPACK_BASE"] = "https://github.com/heroku/heroku-buildpack-ruby"
+ENV["HATCHET_BUILDPACK_BASE"] ||= "https://github.com/heroku/heroku-buildpack-ruby"
 
 ENV['RACK_ENV'] = 'test'
 
@@ -20,6 +20,7 @@
   config.full_backtrace      = true
   config.verbose_retry       = true # show retry status in spec process
   config.default_retry_count = 2 if ENV['IS_RUNNING_ON_CI'] # retry all tests that fail again
+  config.example_status_persistence_file_path = 'spec/examples.txt'
 
   config.expect_with :rspec do |c|
     c.max_formatted_output_length = Float::INFINITY