test/ruby: Check warning messages at a finer granularity

Instead of suppressing all warnings wholly in each test scripts by
setting `$VERBOSE` to `nil` in `setup` methods.

1 files changed, 7 insertions, 0 deletions

diff --git a/tool/lib/test/unit/core_assertions.rb b/tool/lib/test/unit/core_assertions.rb
index 05bf2c27e1..c4c271403b 100644
--- a/tool/lib/test/unit/core_assertions.rb
+++ b/tool/lib/test/unit/core_assertions.rb
@@ -587,6 +587,13 @@ eom
         assert_warning(*args) {$VERBOSE = false; yield}
       end
 
+      def assert_deprecated_warning(mesg = /deprecated/)
+        assert_warning(mesg) do
+          Warning[:deprecated] = true
+          yield
+        end
+      end
+
       class << (AssertFile = Struct.new(:failure_message).new)
         include CoreAssertions
         def assert_file_predicate(predicate, *args)