Added the condition for ruby_core repository.

spec/bundler/bundler/shared_helpers_spec.rb

@@ -223,6 +223,14 @@ RSpec.describe Bundler::SharedHelpers do
       ENV["BUNDLE_GEMFILE"] = "Gemfile"
     end
 
+    let(:setup_path) do
+      if ruby_core?
+        File.expand_path("../../../lib/bundler/setup", __dir__)
+      else
+        File.expand_path("../../lib/bundler/setup", __dir__)
+      end
+    end
+
     shared_examples_for "ENV['PATH'] gets set correctly" do
       before { Dir.mkdir ".bundle" }
 
@@ -236,7 +244,7 @@ RSpec.describe Bundler::SharedHelpers do
     shared_examples_for "ENV['RUBYOPT'] gets set correctly" do
       it "ensures -rbundler/setup is at the beginning of ENV['RUBYOPT']" do
         subject.set_bundle_environment
-        expect(ENV["RUBYOPT"].split(" ")).to start_with("-r#{File.expand_path("../../lib/bundler/setup", __dir__)}")
+        expect(ENV["RUBYOPT"].split(" ")).to start_with("-r#{setup_path}")
       end
     end
 

spec/bundler/commands/exec_spec.rb

@@ -279,7 +279,12 @@ RSpec.describe "bundle exec" do
     G
 
     rubyopt = ENV["RUBYOPT"]
-    rubyopt = "-r#{File.expand_path("../../lib/bundler/setup", __dir__)} #{rubyopt}"
+    setup_path = if ruby_core?
+                   File.expand_path("../../../lib/bundler/setup", __dir__)
+                 else
+                   File.expand_path("../../lib/bundler/setup", __dir__)
+                 end
+    rubyopt = "-r#{setup_path} #{rubyopt}"
 
     bundle "exec 'echo $RUBYOPT'"
     expect(out).to have_rubyopts(rubyopt)