Make the test suite silent

test/ractor_test.rb

@@ -20,18 +20,33 @@ def test_formatting
           source = SyntaxTree.read(filepath)
           program = SyntaxTree.parse(source)
 
-          Ractor.new(source, program, name: filepath) do |source, program|
-            SyntaxTree::Formatter.format(source, program)
+          with_silenced_warnings do
+            Ractor.new(source, program, name: filepath) do |source, program|
+              SyntaxTree::Formatter.format(source, program)
+            end
           end
         end
 
-      ractors.each(&:take)
+      ractors.each { |ractor| assert_kind_of String, ractor.take }
     end
 
     private
 
     def filepaths
       Dir.glob(File.expand_path("../lib/syntax_tree/{node,parser}.rb", __dir__))
     end
+
+    # Ractors still warn about usage, so I'm disabling that warning here just to
+    # have clean test output.
+    def with_silenced_warnings
+      previous = $VERBOSE
+
+      begin
+        $VERBOSE = nil
+        yield
+      ensure
+        $VERBOSE = previous
+      end
+    end
   end
 end

test/rake_test.rb

@@ -46,12 +46,11 @@ def invoke(task_name)
         invocation = nil
         stub = ->(args) { invocation = Invocation.new(args) }
 
-        begin
+        assert_raises SystemExit do
           SyntaxTree::CLI.stub(:run, stub) { ::Rake::Task[task_name].invoke }
-          flunk
-        rescue SystemExit
-          invocation
         end
+
+        invocation
       end
     end
   end