Bugfix for Tms#add! not updating @total

lib/benchmark.rb

@@ -466,6 +466,7 @@ def add!(&blk)
       @cutime = cutime + t.cutime
       @cstime = cstime + t.cstime
       @real   = real + t.real
+      @total  = total + t.total
       self
     end
 

test/benchmark/test_benchmark.rb

@@ -150,6 +150,15 @@ def test_bugs_ruby_dev_40906_can_add_in_place_the_time_of_execution_of_the_block
     assert_not_equal(0, t.real)
   end
 
+  # TODO: Consider combining with the above test
+  def test_add_in_place
+    t = Benchmark::Tms.new
+    assert_equal(0, t.total)
+
+    t.add! { 1000.times do   ; '1'; end }
+    assert_not_equal(0, t.total)
+  end
+
   def test_realtime_output
     sleeptime = 1.0
     realtime = Benchmark.realtime { sleep sleeptime }