WifiManagerTest: Fetch scan results only on scan success

When wifi location scans are off, the scan is expected to fail. But,
WifiManager.getScanResults() could still return results from the last
scan. This was causing the test to fail because it was relying on
|mScanResults| being null to detect scan failure.

Also, changed the scan done internal state name in the test to more accurately
reflect that scan has been completed (could be success or failure).

Bug: 77601152
Test: Ran `atest android.net.wifi.cts.WifiManagerTest#
testWifiManagerScanWhenWifiOffLocationTurnedOn` with location turned on,
but wifi scans turned off.

Change-Id: I6d5203a836d86d03fbb8e9af0035fe951a6b9db8
diff --git a/tests/cts/net/src/android/net/wifi/cts/WifiManagerTest.java b/tests/cts/net/src/android/net/wifi/cts/WifiManagerTest.java
index c435a8a..1a08d3d 100644
--- a/tests/cts/net/src/android/net/wifi/cts/WifiManagerTest.java
+++ b/tests/cts/net/src/android/net/wifi/cts/WifiManagerTest.java
@@ -70,7 +70,7 @@
     private static final int STATE_WIFI_ENABLED = 2;
     private static final int STATE_WIFI_DISABLED = 3;
     private static final int STATE_SCANNING = 4;
-    private static final int STATE_SCAN_RESULTS_AVAILABLE = 5;
+    private static final int STATE_SCAN_DONE = 5;
 
     private static final String TAG = "WifiManagerTest";
     private static final String SSID1 = "\"WifiManagerTest\"";
@@ -96,13 +96,15 @@
         public void onReceive(Context context, Intent intent) {
             final String action = intent.getAction();
             if (action.equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {
+
                 synchronized (mMySync) {
-                    if (mWifiManager.getScanResults() != null) {
+                    if (intent.getBooleanExtra(WifiManager.EXTRA_RESULTS_UPDATED, false)) {
                         mScanResults = mWifiManager.getScanResults();
-                        mMySync.expectedState = STATE_SCAN_RESULTS_AVAILABLE;
-                        mScanResults = mWifiManager.getScanResults();
-                        mMySync.notifyAll();
+                    } else {
+                        mScanResults = null;
                     }
+                    mMySync.expectedState = STATE_SCAN_DONE;
+                    mMySync.notifyAll();
                 }
             } else if (action.equals(WifiManager.WIFI_STATE_CHANGED_ACTION)) {
                 int newState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE,