Fixed stress test for airplane_and_wifi case

Add stress in "stress_toggle_airplane_and_wifi" function

Bug: 136125030
Test:Local test 10 times, pass.

Change-Id: Ie801089bfc1be09936cc453da3c548622d170cfc
diff --git a/acts/tests/google/wifi/WifiTeleCoexTest.py b/acts/tests/google/wifi/WifiTeleCoexTest.py
index 3d30640..340d650 100644
--- a/acts/tests/google/wifi/WifiTeleCoexTest.py
+++ b/acts/tests/google/wifi/WifiTeleCoexTest.py
@@ -117,24 +117,24 @@
                           Airplane mode OFF, in a sequence.
 
         """
-        self.log.debug("Toggling Airplane mode ON")
-
-        asserts.assert_true(
-            acts.utils.force_airplane_mode(self.dut, True),
-            "Can not turn on airplane mode on: %s" % self.dut.serial)
-        # Sleep for atleast 500ms so that, call to enable wifi is not deferred.
-        time.sleep(1)
-
-        self.log.debug("Toggling wifi ON")
-        wifi_utils.wifi_toggle_state(self.dut, True)
-        # Sleep for 1s before getting new WiFi state.
-        time.sleep(1)
-        if not self.dut.droid.wifiGetisWifiEnabled():
-            raise signals.TestFailure("WiFi did not turn on after turning ON"
-                                      " Airplane mode")
-        asserts.assert_true(
-            acts.utils.force_airplane_mode(self.dut, False),
-            "Can not turn on airplane mode on: %s" % self.dut.serial)
+        for count in range(stress_count):
+            self.log.debug("stress_toggle_airplane_and_wifi: Iteration %d" % count)
+            self.log.debug("Toggling Airplane mode ON")
+            asserts.assert_true(
+                acts.utils.force_airplane_mode(self.dut, True),
+                "Can not turn on airplane mode on: %s" % self.dut.serial)
+            # Sleep for atleast 500ms so that, call to enable wifi is not deferred.
+            time.sleep(1)
+            self.log.debug("Toggling wifi ON")
+            wifi_utils.wifi_toggle_state(self.dut, True)
+            # Sleep for 1s before getting new WiFi state.
+            time.sleep(1)
+            if not self.dut.droid.wifiGetisWifiEnabled():
+                raise signals.TestFailure("WiFi did not turn on after turning ON"
+                    " Airplane mode")
+            asserts.assert_true(
+                acts.utils.force_airplane_mode(self.dut, False),
+                "Can not turn on airplane mode on: %s" % self.dut.serial)
 
         if not self.dut.droid.wifiGetisWifiEnabled():
             raise signals.TestFailure("WiFi did not turn on after toggling it"
@@ -161,8 +161,8 @@
             3. Make a short sequence voice call between Phone A and B.
 
         """
-        # Sleep for 5s before getting new WiFi state.
-        time.sleep(5)
+        # Sleep for 30s before getting new WiFi state.
+        time.sleep(30)
         wifi_info = self.dut.droid.wifiGetConnectionInfo()
         if wifi_info[WifiEnums.SSID_KEY] != self.wifi_network_ssid:
             raise signals.TestFailure("Phone failed to connect to %s network on"