[DO NOT MERGE] Allow a settings override for double-line clock

This setting allows users to always show a single-line format clock,
regardless of notification status.

Fixes: 194905512
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.display
Change-Id: I94ade1b2d968e5783750e7a98a9a5d28cc22b659

tests/robotests/src/com/android/settings/display/LockscreenClockPreferenceControllerTest.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2021 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 com.android.settings.display;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.ContentResolver;
+import android.content.Context;
+import android.provider.Settings;
+
+import androidx.preference.Preference;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+
+@RunWith(RobolectricTestRunner.class)
+public class LockscreenClockPreferenceControllerTest {
+
+    private static final String TEST_KEY = "test_key";
+    private static final String SETTING_KEY = Settings.Secure.LOCKSCREEN_USE_DOUBLE_LINE_CLOCK;
+
+    private Context mContext;
+    private ContentResolver mContentResolver;
+    private LockscreenClockPreferenceController mController;
+
+    @Mock
+    private Preference mPreference;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = RuntimeEnvironment.application;
+        mContentResolver = mContext.getContentResolver();
+        mController = new LockscreenClockPreferenceController(mContext, TEST_KEY);
+    }
+
+    @Test
+    public void isChecked_SettingIs1_returnTrue() {
+        Settings.Secure.putInt(mContentResolver, SETTING_KEY, 1);
+
+        assertThat(mController.isChecked()).isTrue();
+    }
+
+    @Test
+    public void isChecked_SettingIs0_returnFalse() {
+        Settings.Secure.putInt(mContentResolver, SETTING_KEY, 0);
+
+        assertThat(mController.isChecked()).isFalse();
+    }
+
+    @Test
+    public void isChecked_SettingIsNotSet_returnTrue() {
+        Settings.Secure.putString(mContentResolver, SETTING_KEY, null);
+
+        assertThat(mController.isChecked()).isTrue();
+    }
+
+    @Test
+    public void setChecked_true_SettingIsNot0() {
+        mController.setChecked(true);
+
+        assertThat(Settings.Secure.getInt(mContentResolver, SETTING_KEY, 0)).isNotEqualTo(0);
+    }
+
+    @Test
+    public void setChecked_false_SettingIs0() {
+        mController.setChecked(false);
+
+        assertThat(Settings.Secure.getInt(mContentResolver, SETTING_KEY, 0)).isEqualTo(0);
+    }
+}