Add fallback when PWD is not set

1 files changed, 6 insertions, 2 deletions

diff --git a/spec/bundler/runtime/setup_spec.rb b/spec/bundler/runtime/setup_spec.rb
index 09430d6a8c..e2bed00a7f 100644
--- a/spec/bundler/runtime/setup_spec.rb
+++ b/spec/bundler/runtime/setup_spec.rb
@@ -1340,8 +1340,12 @@ end
       # override the default gem.
       def load_path_exclusions_hack_for(name)
         if ruby_core?
-          # .ext/common is relative from build directory
-          ext_folder = Pathname(ENV["PWD"]) + ".ext/common"
+          if ENV.key?("PWD")
+            # .ext/common is relative from build directory
+            ext_folder = Pathname(ENV["PWD"]) + ".ext/common"
+          else
+            ext_folder = source_root.join(".ext/common")
+          end
           require_name = name.tr("-", "/")
           if File.exist?(ext_folder.join("#{require_name}.rb"))
             { :exclude_from_load_path => ext_folder.to_s }