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-rw-r--r--test/ruby/envutil.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/ruby/envutil.rb b/test/ruby/envutil.rb
index ce7226f86d..732f0eeba8 100644
--- a/test/ruby/envutil.rb
+++ b/test/ruby/envutil.rb
@@ -62,7 +62,7 @@ module EnvUtil
else
th_stdout = Thread.new { out_p.read } if capture_stdout
th_stderr = Thread.new { err_p.read } if capture_stderr && capture_stderr != :merge_to_stdout
- in_p.write stdin_data.to_str
+ in_p.write stdin_data.to_str unless stdin_data.empty?
in_p.close
if (!th_stdout || th_stdout.join(timeout)) && (!th_stderr || th_stderr.join(timeout))
stdout = th_stdout.value if capture_stdout