[RTT][CTS] Add information to assert to help debug failures

Modify the assert message to print out the # of failures and the total
number of iterations. Will help diagnose scope of test failures.

Bug: 109836816
Test: atest WifiRttTest
Change-Id: Ic4d5b6844225edbd9704694c539e31754b7a340c
diff --git a/tests/tests/net/src/android/net/wifi/rtt/cts/WifiRttTest.java b/tests/tests/net/src/android/net/wifi/rtt/cts/WifiRttTest.java
index 1171a6b..74a0c3d 100644
--- a/tests/tests/net/src/android/net/wifi/rtt/cts/WifiRttTest.java
+++ b/tests/tests/net/src/android/net/wifi/rtt/cts/WifiRttTest.java
@@ -157,7 +157,8 @@
         reportLog.submit();
 
         // Analyze results
-        assertTrue("Wi-Fi RTT failure rate exceeds threshold",
+        assertTrue("Wi-Fi RTT failure rate exceeds threshold: FAIL=" + numFailures + ", ITERATIONS="
+                        + NUM_OF_RTT_ITERATIONS,
                 numFailures <= NUM_OF_RTT_ITERATIONS * MAX_FAILURE_RATE_PERCENT / 100);
         if (numFailures != NUM_OF_RTT_ITERATIONS) {
             double distanceAvg = distanceSum / (NUM_OF_RTT_ITERATIONS - numFailures);