1 files changed, 8 insertions, 0 deletions
diff --git a/test/lib/minitest/unit.rb b/test/lib/minitest/unit.rb
index c51baf7cf8..7fdbc4b291 100644
--- a/test/lib/minitest/unit.rb
+++ b/test/lib/minitest/unit.rb
@@ -130,11 +130,16 @@ module MiniTest
       return "Expected: #{mu_pp exp}\n  Actual: #{mu_pp act}" unless
         need_to_diff
 
+      tempfile_a = nil
+      tempfile_b = nil
+
       Tempfile.open("expect") do |a|
+        tempfile_a = a
         a.puts expect
         a.flush
 
         Tempfile.open("butwas") do |b|
+          tempfile_b = b
           b.puts butwas
           b.flush
 
@@ -155,6 +160,9 @@ module MiniTest
       end
 
       result
+    ensure
+      tempfile_a.close! if tempfile_a
+      tempfile_b.close! if tempfile_b
     end
 
     ##