1 files changed, 3 insertions, 3 deletions
diff --git a/lib/rubygems/test_case.rb b/lib/rubygems/test_case.rb
index a8261ef5c2..6523c515be 100644
--- a/lib/rubygems/test_case.rb
+++ b/lib/rubygems/test_case.rb
@@ -250,16 +250,16 @@ class Gem::TestCase < Minitest::Test
   def assert_contains_make_command(target, output, msg = nil)
     if output.match(/\n/)
       msg = message(msg) do
-        'Expected output containing make command "%s": %s' % [
+        "Expected output containing make command \"%s\", but was \n\nBEGIN_OF_OUTPUT\n%sEND_OF_OUTPUT" % [
           ('%s %s' % [make_command, target]).rstrip,
-          output.inspect,
+          output,
         ]
       end
     else
       msg = message(msg) do
         'Expected make command "%s": %s' % [
           ('%s %s' % [make_command, target]).rstrip,
-          output.inspect,
+          output,
         ]
       end
     end