CTS: Add test for WifiFrameworkInitializer

Bug: 150236894
Test: atest android.net.wifi.cts.WifiFrameworkInitializerTest
Change-Id: Ib53cab3be8eb059a2b334361882e33e25ba0b760

tests/cts/net/src/android/net/wifi/cts/WifiFrameworkInitializerTest.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.net.wifi.cts;
+
+import android.net.wifi.WifiFrameworkInitializer;
+import android.test.AndroidTestCase;
+
+public class WifiFrameworkInitializerTest extends AndroidTestCase {
+    /**
+     * WifiFrameworkInitializer.registerServiceWrappers() should only be called by
+     * SystemServiceRegistry during boot up when Wifi is first initialized. Calling this API at
+     * any other time should throw an exception.
+     */
+    public void testRegisterServiceWrappers_failsWhenCalledOutsideOfSystemServiceRegistry() {
+        if (!WifiFeature.isWifiSupported(getContext())) {
+            // skip the test if WiFi is not supported
+            return;
+        }
+        try {
+            WifiFrameworkInitializer.registerServiceWrappers();
+            fail("Expected exception when calling "
+                    + "WifiFrameworkInitializer.registerServiceWrappers() outside of "
+                    + "SystemServiceRegistry!");
+        } catch (IllegalStateException expected) {}
+    }
+}