Fix the case of multiple trailers

1 files changed, 11 insertions, 0 deletions

diff --git a/tool/test/test_sync_default_gems.rb b/tool/test/test_sync_default_gems.rb
index 7e6a6d830e..602598c3e3 100755
--- a/tool/test/test_sync_default_gems.rb
+++ b/tool/test/test_sync_default_gems.rb
@@ -51,5 +51,16 @@ module Test_SyncDefaultGems
       ]
       assert_message_filter(expected, trailers, [expected, "", trailers, ""].join("\n"))
     end
+
+    def test_multiple_co_authored_by
+      expected = [
+        "many commits",
+      ]
+      trailers = [
+        "Co-authored-by: git <git@ruby-lang.org>",
+        "Co-authored-by: svn <svn@ruby-lang.org>",
+      ]
+      assert_message_filter(expected, trailers, [expected, "", trailers, ""].join("\n"))
+    end
   end
 end