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-rw-r--r--lib/rubygems/test_case.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rubygems/test_case.rb b/lib/rubygems/test_case.rb
index b6bb7ca93e..4b43df539d 100644
--- a/lib/rubygems/test_case.rb
+++ b/lib/rubygems/test_case.rb
@@ -739,6 +739,7 @@ class Gem::TestCase < (defined?(Minitest::Test) ? Minitest::Test : MiniTest::Uni
spec.files = files
lib_dir = File.join(@tempdir, "default_gems", "lib")
+ lib_dir.instance_variable_set(:@gem_prelude_index, lib_dir)
$LOAD_PATH.unshift(lib_dir)
files.each do |file|
rb_path = File.join(lib_dir, file)