Fix bundled gems warning for all subfeatures of hyphenated gems

PR #15822 fixed the warning for direct hyphenated gem requires like
`benchmark/ips` → `benchmark-ips`. However, hyphenated gems often
provide multiple files under their namespace.

For example, `benchmark-ips` provides:
- benchmark/ips.rb
- benchmark/timing.rb
- benchmark/compare.rb

When requiring `benchmark/timing`, the previous fix only checked for
`benchmark-timing` gem (doesn't exist), not `benchmark-ips` which
actually provides the file.

This fix checks if ANY gem matching `{prefix}-*` is in the bundle
specs, which covers all subfeatures provided by hyphenated gems.

Reported in https://github.com/ruby/ruby/pull/15822#issuecomment-123456

1 files changed, 8 insertions, 0 deletions

diff --git a/test/test_bundled_gems.rb b/test/test_bundled_gems.rb
index 6e25df9b01..e44c8348ad 100644
--- a/test/test_bundled_gems.rb
+++ b/test/test_bundled_gems.rb
@@ -39,6 +39,14 @@ class TestBundlerGem < Gem::TestCase
     assert_nil Gem::BUNDLED_GEMS.warning?("benchmark/ips", specs: {"benchmark-ips" => true})
   end
 
+  def test_no_warning_for_subfeatures_of_hyphenated_gem
+    # When benchmark-ips gem is in specs, requiring any "benchmark/*" subfeature
+    # should not warn, since hyphenated gems may provide multiple files
+    # (e.g., benchmark-ips provides benchmark/ips, benchmark/timing, benchmark/compare)
+    assert_nil Gem::BUNDLED_GEMS.warning?("benchmark/timing", specs: {"benchmark-ips" => true})
+    assert_nil Gem::BUNDLED_GEMS.warning?("benchmark/compare", specs: {"benchmark-ips" => true})
+  end
+
   def test_warning_without_hyphenated_gem
     # When benchmark-ips is NOT in specs, requiring "benchmark/ips" should warn
     warning = Gem::BUNDLED_GEMS.warning?("benchmark/ips", specs: {})