https://git.ruby-lang.org/ruby.git/commit/?id=7b3b48549b

From 7b3b48549b189315a307703f93facb603339179e Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Tue, 11 May 2021 13:12:33 +0900
Subject: [rubygems/rubygems] capture_output will return empty string, not nil

https://github.com/rubygems/rubygems/commit/3fa93f6144
---
 test/rubygems/test_gem_specification.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/rubygems/test_gem_specification.rb b/test/rubygems/test_gem_specification.rb
index eff7c85..7e82793 100644
--- a/test/rubygems/test_gem_specification.rb
+++ b/test/rubygems/test_gem_specification.rb
@@ -3066,7 +3066,7 @@ Please report a bug if this causes problems. https://github.com/ruby/ruby/blob/trunk/test/rubygems/test_gem_specification.rb#L3066
     out, err = capture_output do
       @a1.add_runtime_dependency "b", "~> 3.0", "~> 3.0"
     end
-    assert_nil out
+    assert_empty out
     assert_equal(expected, err)
   end
 
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