Create robolectric tests for WifiNetworkDetailsFragment.

More tests to follow in separate CLs. Submitting test class in order to
unblock parallel development.

Bug: 35963536
Test: make RunSettingsRoboTests
Change-Id: I50752ba0d6c53d016bf5809f7bd5d5f6e0350b90

tests/robotests/src/android/net/NetworkBadging.java

@@ -0,0 +1,34 @@
+package android.net;
+
+import android.annotation.IntDef;
+import android.annotation.Nullable;
+import android.content.res.Resources;
+import android.graphics.Color;
+import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.Drawable;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+/**
+ * Implementation for {@link android.net.NetworkBadging}.
+ *
+ * <p>Can be removed once Robolectric supports Android O.
+ */
+public class NetworkBadging {
+    @IntDef({BADGING_NONE, BADGING_SD, BADGING_HD, BADGING_4K})
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface Badging {}
+
+    public static final int BADGING_NONE = 0;
+    public static final int BADGING_SD = 10;
+    public static final int BADGING_HD = 20;
+    public static final int BADGING_4K = 30;
+
+    private static Drawable drawable;
+
+    public static Drawable getWifiIcon(
+            int signalLevel, @NetworkBadging.Badging int badging, @Nullable Resources.Theme theme) {
+        return new ColorDrawable(Color.GREEN);
+    }
+}

tests/robotests/src/android/net/wifi/WifiNetworkScoreCache.java

@@ -0,0 +1,10 @@
+package android.net.wifi;
+
+/**
+ * Empty class def for {@link android.net.wifi.WifiNetworkScoreCache}.
+ *
+ * <p>Can be removed once Robolectric supports Android O.
+ */
+public class WifiNetworkScoreCache {
+
+}