Split test gem installation to a separate task

We run into a race condition when testing in parallel when all
processors install test gems to their test folder (due to shared gem
cache). So I figure we can instead run this setup sequentially
beforehand.

1 files changed, 28 insertions, 8 deletions

diff --git a/spec/support/rubygems_ext.rb b/spec/support/rubygems_ext.rb
index d41ee64bec..b9bbfde2b3 100644
--- a/spec/support/rubygems_ext.rb
+++ b/spec/support/rubygems_ext.rb
@@ -51,15 +51,9 @@ module Spec
     end
 
     def setup
-      require "fileutils"
-
-      Gem.clear_paths
-
-      ENV["BUNDLE_PATH"] = nil
-      ENV["GEM_HOME"] = ENV["GEM_PATH"] = Path.base_system_gems.to_s
-      ENV["PATH"] = [Path.bindir, Path.system_gem_path.join("bin"), ENV["PATH"]].join(File::PATH_SEPARATOR)
+      install_test_deps
 
-      install_gems(DEPS)
+      require "fileutils"
 
       FileUtils.mkdir_p(Path.home)
       FileUtils.mkdir_p(Path.tmpdir)
@@ -71,6 +65,32 @@ module Spec
       Gem::DefaultUserInteraction.ui = Gem::SilentUI.new
     end
 
+    def install_parallel_test_deps
+      require "parallel"
+
+      prev_env_test_number = ENV["TEST_ENV_NUMBER"]
+
+      begin
+        Parallel.processor_count.times do |n|
+          ENV["TEST_ENV_NUMBER"] = (n + 1).to_s
+
+          install_test_deps
+        end
+      ensure
+        ENV["TEST_ENV_NUMBER"] = prev_env_test_number
+      end
+    end
+
+    def install_test_deps
+      Gem.clear_paths
+
+      ENV["BUNDLE_PATH"] = nil
+      ENV["GEM_HOME"] = ENV["GEM_PATH"] = Path.base_system_gems.to_s
+      ENV["PATH"] = [Path.bindir, Path.system_gem_path.join("bin"), ENV["PATH"]].join(File::PATH_SEPARATOR)
+
+      install_gems(DEPS)
+    end
+
   private
 
     def gem_load_and_activate(gem_name, bin_container)