test v8 heap stats and aggregate all

lib/stats_socket.rb

@@ -14,6 +14,12 @@ class StatsSocket < SocketServer
       when "gc_stat"
         GC.stat.to_json
       when "v8_stat"
+        stats = {}
+        ObjectSpace.each_object(MiniRacer::Context) do |context|
+          context.heap_stats.each do |k,v|
+            stats[k] = (stats[k] || 0) + v
+          end
+        end
         PrettyText.v8.heap_stats.to_json
       else
         "[\"UNKNOWN COMMAND\"]"

spec/components/stats_socket_spec.rb

@@ -40,6 +40,18 @@ describe StatsSocket do
     parsed = JSON.parse(line)
 
     expect(parsed.keys.sort).to eq(GC.stat.keys.map(&:to_s).sort)
+
+    # make sure we have libv8 going
+    PrettyText.cook("x")
+
+    socket = UNIXSocket.new(socket_path)
+    socket.send "v8_stat\n", 0
+    line = socket.readline
+    socket.close
+
+    parsed = JSON.parse(line)
+
+    expect(parsed['total_physical_size']).to be>(0)
   end
 
 end