Do not switch a connection if the new connection is not ready to send packets.

webrtc/base/gunit.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 74 matching lines @@
                     << (timeout) << "ms; waiting an additional " << margin \
                     << "ms";                                               \
     WAIT_(ex, margin, res);                                                \
     if (!res) {                                                            \
       EXPECT_TRUE(ex);                                                     \
     }                                                                      \
   } while (0)
 
 // Wait until "ex" is true, or "timeout" expires, using fake clock where
 // messages are processed every millisecond.
-#define SIMULATED_WAIT(ex, timeout, clock)                  \
-  for (int64_t start = rtc::TimeMillis();                   \
-       !(ex) && rtc::TimeMillis() < start + (timeout);) {   \
-    clock.AdvanceTime(rtc::TimeDelta::FromMilliseconds(1)); \
+#define SIMULATED_WAIT(ex, timeout, clock)                    \
+  for (int64_t start = rtc::TimeMillis();                     \
+       !(ex) && rtc::TimeMillis() < start + (timeout);) {     \
+    (clock).AdvanceTime(rtc::TimeDelta::FromMilliseconds(1)); \
   }
 
 // This returns the result of the test in res, so that we don't re-evaluate
 // the expression in the XXXX_WAIT macros below, since that causes problems
 // when the expression is only true the first time you check it.
-#define SIMULATED_WAIT_(ex, timeout, res, clock)              \
-  do {                                                        \
-    int64_t start = rtc::TimeMillis();                        \
-    res = (ex);                                               \
-    while (!res && rtc::TimeMillis() < start + (timeout)) {   \
-      clock.AdvanceTime(rtc::TimeDelta::FromMilliseconds(1)); \
-      res = (ex);                                             \
-    }                                                         \
+#define SIMULATED_WAIT_(ex, timeout, res, clock)                \
+  do {                                                          \
+    int64_t start = rtc::TimeMillis();                          \
+    res = (ex);                                                 \
+    while (!res && rtc::TimeMillis() < start + (timeout)) {     \
+      (clock).AdvanceTime(rtc::TimeDelta::FromMilliseconds(1)); \
+      res = (ex);                                               \
+    }                                                           \
   } while (0)
 
 // The typical EXPECT_XXXX, but done until true or a timeout with a fake clock.
 #define EXPECT_TRUE_SIMULATED_WAIT(ex, timeout, clock) \
   do {                                                 \
     bool res;                                          \
     SIMULATED_WAIT_(ex, timeout, res, clock);          \
     if (!res) {                                        \
       EXPECT_TRUE(ex);                                 \
     }                                                  \
@@ skipping 18 matching lines @@
 
 #define ASSERT_EQ_SIMULATED_WAIT(v1, v2, timeout, clock) \
   do {                                                   \
     bool res;                                            \
     SIMULATED_WAIT_(v1 == v2, timeout, res, clock);      \
     if (!res)                                            \
       ASSERT_EQ(v1, v2);                                 \
   } while (0)
 
 #endif  // WEBRTC_BASE_GUNIT_H_