Replace dynamic summary text for SettingPref

All SettingPrefs that have dynamic summaries are replaced
by placeholder text. Changes are for:
- Battery Saver "Turn on automatically"
- Notification "Dock speaker plays"
- Notification "Emergency tone"

Bug: 36101902
Test: make RunSettingsRoboTests
Change-Id: Ic2556055c155989015dbef6b507d3e3b45b779b5

tests/robotests/src/com/android/settings/notification/SettingPrefTest.java

@@ -0,0 +1,67 @@
+package com.android.settings.notification;
+
+import android.content.res.Resources;
+
+import android.content.Context;
+import android.provider.Settings;
+import android.support.v7.preference.DropDownPreference;
+import com.android.settings.SettingsRobolectricTestRunner;
+import com.android.settings.TestConfig;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Mockito.spy;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class SettingPrefTest {
+
+    @Test
+    public void update_setsDropDownSummaryText() {
+        Context context = RuntimeEnvironment.application;
+        String testSetting = "test_setting";
+        int[] values = new int[] {1,2,3};
+        String[] entries = new String[] {"one", "two", "three"};
+        SettingPref settingPref =
+                spy(new SettingPref(SettingPref.TYPE_GLOBAL, "key", testSetting, 0, values) {
+                    @Override
+                    protected String getCaption(Resources res, int value) {
+                        return "temp";
+                    }
+                });
+        DropDownPreference dropdownPref = spy(new DropDownPreference(context));
+        dropdownPref.setEntries(entries);
+        settingPref.mDropDown = dropdownPref;
+        Settings.Global.putInt(context.getContentResolver(), testSetting, values[2]);
+
+        settingPref.update(context);
+
+        assertThat(settingPref.mDropDown.getSummary()).isEqualTo(entries[2]);
+    }
+
+    @Test
+    public void update_setsDropDownSummaryText_noMatch_noError() {
+        Context context = RuntimeEnvironment.application;
+        String testSetting = "test_setting";
+        int[] values = new int[] {1,2,3};
+        String[] entries = new String[] {"one", "two", "three"};
+        SettingPref settingPref =
+                spy(new SettingPref(SettingPref.TYPE_GLOBAL, "key", testSetting, 0, values) {
+                    @Override
+                    protected String getCaption(Resources res, int value) {
+                        return "temp";
+                    }
+                });
+        DropDownPreference dropdownPref = spy(new DropDownPreference(context));
+        dropdownPref.setEntries(entries);
+        settingPref.mDropDown = dropdownPref;
+        Settings.Global.putInt(context.getContentResolver(), testSetting, -1);
+
+        settingPref.update(context);
+
+        assertThat(settingPref.mDropDown.getSummary()).isNull();
+    }
+}