Expose mac address in bluetooth main page

This mac address means the owned device, not the device
to connect.

Bug: 35875420
Test: RunSettingsRoboTests
Change-Id: I142f49fdca72d8ffbb9b8b2e2666a61aefb80505

tests/robotests/src/com/android/settings/bluetooth/BluetoothSettingsTest.java

@@ -16,22 +16,74 @@
 
 package com.android.settings.bluetooth;
 
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.spy;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.os.UserManager;
+import android.support.v7.preference.Preference;
+
+import com.android.settings.R;
 import com.android.settings.SettingsRobolectricTestRunner;
 import com.android.settings.TestConfig;
+import com.android.settingslib.bluetooth.LocalBluetoothAdapter;
 
+import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
 import org.robolectric.annotation.Config;
 
 @RunWith(SettingsRobolectricTestRunner.class)
 @Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
 public class BluetoothSettingsTest {
+    private static final String FOOTAGE_MAC_STRING = "Bluetooth mac: xxxx";
+
+    @Mock
+    private UserManager mUserManager;
+    @Mock
+    private Resources mResource;
+    @Mock
+    private Context mContext;
+    @Mock
+    private LocalBluetoothAdapter mLocalAdapter;
+    private BluetoothSettings mFragment;
+    private Preference mMyDevicePreference;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        mFragment = spy(new BluetoothSettings());
+        doReturn(mContext).when(mFragment).getContext();
+        doReturn(mResource).when(mFragment).getResources();
+
+        mMyDevicePreference = new Preference(RuntimeEnvironment.application);
+
+        mFragment.setLocalBluetoothAdapter(mLocalAdapter);
+    }
 
     @Test
     public void setTextSpan_notSpannable_shouldNotCrash() {
         final String str = "test";
-        final BluetoothSettings settings = new BluetoothSettings();
-        settings.setTextSpan(str, "hello");
+        mFragment.setTextSpan(str, "hello");
+    }
+
+    @Test
+    public void setUpdateMyDevicePreference_setTitleCorrectly() {
+        doReturn(FOOTAGE_MAC_STRING).when(mFragment).getString(
+                eq(R.string.bluetooth_footer_mac_message), any());
+
+        mFragment.updateMyDevicePreference(mMyDevicePreference);
+
+        assertThat(mMyDevicePreference.getTitle()).isEqualTo(FOOTAGE_MAC_STRING);
     }
 
 }