clarify an assert_equal + newline + backslash n test output to be more readable

zenspider · zenspider · commit b3dcd38f90be · 2025-08-17T02:15:18.000-08:00
[git-p4: depot-paths = "//src/minitest/dev/": change = 14552]
diff --git a/test/minitest/test_minitest_assertions.rb b/test/minitest/test_minitest_assertions.rb
@@ -318,13 +318,13 @@ def test_assert_equal_string_bug791
   end
 
   def test_assert_equal_string_both_escaped_unescaped_newlines
-    msg = <<~EOM
+    msg = <<~'EOM' # NOTE: single quotes on heredoc
           --- expected
           +++ actual
           @@ -1,2 +1 @@
-          -"A\\n
+          -"A\n
           -B"
-          +"A\\n\\\\nB"
+          +"A\n\\nB"
           EOM
 
     assert_triggered msg do
