Add duration_cast when printing expected ms

Summary: As per Yedidya Feldblum comment on my previous diff, we need a duration cast in here.

Reviewed By: yfeldblum

Differential Revision: D13833032

fbshipit-source-id: 8819694875bd3a7e4f54102d8ac77490f8287fbb

folly/io/async/test/Util.h

@@ -38,7 +38,9 @@
 #define T_CHECK_TIMEOUT(start, end, expectedMS, ...)                       \
   EXPECT_TRUE(::folly::checkTimeout(                                       \
       (start), (end), (expectedMS), false, ##__VA_ARGS__))                 \
-      << "Timeout violates constraints, expectedMs = " << (expectedMS).count() \
+      << "Timeout violates constraints, expectedMs = "                     \
+      << std::chrono::duration_cast<std::chrono::milliseconds>(expectedMS) \
+             .count()                                                      \
       << ", elapsed wall time ms = "                                       \
       << std::chrono::duration_cast<std::chrono::milliseconds>(            \
              (end).getTime() - (start).getTime())                          \
@@ -54,7 +56,9 @@
   EXPECT_TRUE(::folly::checkTimeout(                                       \
       (start), (end), (expectedMS), true, ##__VA_ARGS__))                  \
       << "Interval violates constraints, expectedMs = "                    \
-      << (expectedMS).count() << ", elapsed wall time ms = "    \
+      << std::chrono::duration_cast<std::chrono::milliseconds>(expectedMS) \
+             .count()                                                      \
+      << ", elapsed wall time ms = "                                       \
       << std::chrono::duration_cast<std::chrono::milliseconds>(            \
              (end).getTime() - (start).getTime())                          \
              .count();