WifiLockTest: Test WifiLock.setWorkSource()

Bug: 150236894
Test: atest android.net.wifi.cts.WifiLockTest
Change-Id: I1a6975590c2a4b885c90690e4269ba35bcaf34ff
diff --git a/tests/cts/net/src/android/net/wifi/cts/WifiLockTest.java b/tests/cts/net/src/android/net/wifi/cts/WifiLockTest.java
index 6ac92d4..fee9ef0 100644
--- a/tests/cts/net/src/android/net/wifi/cts/WifiLockTest.java
+++ b/tests/cts/net/src/android/net/wifi/cts/WifiLockTest.java
@@ -19,6 +19,7 @@
 import android.content.Context;
 import android.net.wifi.WifiManager;
 import android.net.wifi.WifiManager.WifiLock;
+import android.os.WorkSource;
 import android.platform.test.annotations.AppModeFull;
 import android.test.AndroidTestCase;
 
@@ -50,6 +51,7 @@
         WifiLock wl = wm.createWifiLock(lockType, WIFI_TAG);
 
         wl.setReferenceCounted(true);
+        wl.setWorkSource(new WorkSource());
         assertFalse(wl.isHeld());
         wl.acquire();
         assertTrue(wl.isHeld());