Refactor time format preference to be more modular/testable

Change-Id: Ib6c06de9f942c3bb06384947f6b1923b33e511bc
Fixes: 32972964
Test: make RunSettingsRoboTests

tests/robotests/src/com/android/settings/datetime/TimeFormatPreferenceControllerTest.java

@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2016 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.datetime;
+
+
+import android.content.Context;
+import android.provider.Settings;
+import android.support.v14.preference.SwitchPreference;
+import android.support.v7.preference.PreferenceScreen;
+
+import com.android.settings.SettingsRobolectricTestRunner;
+import com.android.settings.TestConfig;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.annotation.Config;
+import org.robolectric.shadows.ShadowApplication;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Answers.RETURNS_DEEP_STUBS;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class TimeFormatPreferenceControllerTest {
+
+    @Mock(answer = RETURNS_DEEP_STUBS)
+    private PreferenceScreen mScreen;
+    @Mock
+    private UpdateTimeAndDateCallback mCallback;
+
+    private Context mContext;
+    private SwitchPreference mPreference;
+    private TimeFormatPreferenceController mController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = ShadowApplication.getInstance().getApplicationContext();
+    }
+
+    @Test
+    public void isCalledFromSUW_NotAvailable() {
+        mController = new TimeFormatPreferenceController(mContext, mCallback, true);
+
+        assertThat(mController.isAvailable()).isFalse();
+    }
+
+    @Test
+    public void notCalledFromSUW_shouldBeAvailable() {
+        mController = new TimeFormatPreferenceController(mContext, mCallback, false);
+
+        assertThat(mController.isAvailable()).isTrue();
+    }
+
+    @Test
+    public void updateState_24HourSet_shouldCheckPreference() {
+        mController = new TimeFormatPreferenceController(mContext, mCallback, false);
+        mPreference = new SwitchPreference(mContext);
+        mPreference.setKey(mController.getPreferenceKey());
+        Settings.System.putString(mContext.getContentResolver(), Settings.System.TIME_12_24,
+                TimeFormatPreferenceController.HOURS_24);
+
+        mController.updateState(mPreference);
+
+        assertThat(mPreference.isChecked()).isTrue();
+    }
+
+    @Test
+    public void updateState_12HourSet_shouldNotCheckPreference() {
+        mController = new TimeFormatPreferenceController(mContext, mCallback, false);
+        mPreference = new SwitchPreference(mContext);
+        mPreference.setKey(mController.getPreferenceKey());
+        Settings.System.putString(mContext.getContentResolver(), Settings.System.TIME_12_24,
+                TimeFormatPreferenceController.HOURS_12);
+
+        mController.updateState(mPreference);
+
+        assertThat(mPreference.isChecked()).isFalse();
+    }
+}