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-rw-r--r--test/rubygems/test_gem_source_git.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/rubygems/test_gem_source_git.rb b/test/rubygems/test_gem_source_git.rb
index 73ed8dd2ef..b97556d61d 100644
--- a/test/rubygems/test_gem_source_git.rb
+++ b/test/rubygems/test_gem_source_git.rb
@@ -68,6 +68,7 @@ class TestGemSourceGit < Gem::TestCase
git_gem 'b'
Dir.chdir 'git/a' do
+ require "open3"
output, status = Open3.capture2e(@git, 'submodule', '--quiet', 'add', File.expand_path('../b'), 'b')
assert status.success?, output