CTS: test WifiNl80211Manager.sendMgmtFrame

Link probing is an optional feature gated by an
overlay. Unfortunately, there is no public/system API
that can be used to check if link probing is
supported on the device.

`adb shell cmd wifi send-link-probe` requires
root, which is not supported by CTS.

For devices that do not support link probing, this API
could even throw an exception. Thus, this test does
not have any expectations.

Bug: 150978929
Test: atest android.net.wifi.nl80211.cts.WifiNl80211ManagerTest
Change-Id: I13f9be5571c0eb7d64cc86bea5b7fd8addc1db5c

tests/cts/net/src/android/net/wifi/nl80211/cts/WifiNl80211ManagerTest.java

@@ -42,11 +42,13 @@ import java.util.Arrays;
 @RunWith(AndroidJUnit4.class)
 public class WifiNl80211ManagerTest {
 
+    private Context mContext;
+
     @Before
     public void setUp() {
-        Context context = InstrumentationRegistry.getInstrumentation().getContext();
+        mContext = InstrumentationRegistry.getInstrumentation().getContext();
         // skip tests if Wifi is not supported
-        assumeTrue(WifiFeature.isWifiSupported(context));
+        assumeTrue(WifiFeature.isWifiSupported(mContext));
     }
 
     @Test
@@ -64,4 +66,19 @@ public class WifiNl80211ManagerTest {
                 .isEqualTo(Arrays.asList(ScanResult.CIPHER_NONE, ScanResult.CIPHER_TKIP));
         assertThat(securityType.groupCipher).isEqualTo(ScanResult.CIPHER_CCMP);
     }
+
+    @Test
+    public void testSendMgmtFrame() {
+        try {
+            WifiNl80211Manager manager = mContext.getSystemService(WifiNl80211Manager.class);
+            manager.sendMgmtFrame("wlan0", new byte[]{}, -1, Runnable::run,
+                    new WifiNl80211Manager.SendMgmtFrameCallback() {
+                        @Override
+                        public void onAck(int elapsedTimeMs) {}
+
+                        @Override
+                        public void onFailure(int reason) {}
+                    });
+        } catch (Exception ignore) {}
+    }
 }