Add Smooth Display option to developer in Settings

Force to the highest refresh rate.

Bug: 137064289
Test:$ adb root
$ adb shell "echo 1 > /d/tracing/events/sde/enable"
$ adb shell "echo 1 > /d/tracing/tracing_on"
$ adb shell "cat /d/tracing/trace_pipe" | grep FPS

Change-Id: Ia1f804cbc7e297a85591e6b0f293ca1014301b74

tests/robotests/src/com/android/settings/development/ForcePeakRefreshRatePreferenceControllerTest.java

@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2020 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.development;
+
+import static com.android.settings.development.ForcePeakRefreshRatePreferenceController.DEFAULT_REFRESH_RATE;
+import static com.android.settings.development.ForcePeakRefreshRatePreferenceController.NO_CONFIG;
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.provider.Settings;
+
+import androidx.preference.PreferenceScreen;
+import androidx.preference.SwitchPreference;
+
+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;
+import org.robolectric.annotation.Config;
+
+import android.util.Log;
+
+@RunWith(RobolectricTestRunner.class)
+public class ForcePeakRefreshRatePreferenceControllerTest {
+
+    @Mock
+    private SwitchPreference mPreference;
+    @Mock
+    private PreferenceScreen mScreen;
+
+    private Context mContext;
+    private ForcePeakRefreshRatePreferenceController mController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = RuntimeEnvironment.application;
+        mController = new ForcePeakRefreshRatePreferenceController(mContext);
+        when(mScreen.findPreference(mController.getPreferenceKey())).thenReturn(mPreference);
+        when(mPreference.getKey()).thenReturn(mController.getPreferenceKey());
+        mController.displayPreference(mScreen);
+    }
+
+    @Test
+    public void onPreferenceChange_preferenceChecked_shouldEnableForcePeak() {
+        mController.mPeakRefreshRate = 88f;
+
+        mController.onPreferenceChange(mPreference, true);
+
+        assertThat(Settings.System.getFloat(mContext.getContentResolver(),
+                Settings.System.MIN_REFRESH_RATE, NO_CONFIG)).isEqualTo(88f);
+    }
+
+    @Test
+    public void onPreferenceChange_preferenceUnchecked_shouldDisableForcePeak() {
+        mController.mPeakRefreshRate = 88f;
+
+        mController.onPreferenceChange(mPreference, false);
+
+        assertThat(Settings.System.getFloat(mContext.getContentResolver(),
+                Settings.System.MIN_REFRESH_RATE, NO_CONFIG)).isEqualTo(NO_CONFIG);
+    }
+
+    @Test
+    public void updateState_enableForcePeak_shouldCheckedToggle() {
+        mController.mPeakRefreshRate = 88f;
+        mController.forcePeakRefreshRate(true);
+
+        mController.updateState(mPreference);
+
+        verify(mPreference).setChecked(true);
+    }
+
+    @Test
+    public void updateState_disableForcePeak_shouldUncheckedToggle() {
+        mController.mPeakRefreshRate = 88f;
+        mController.forcePeakRefreshRate(false);
+
+        mController.updateState(mPreference);
+
+        verify(mPreference).setChecked(false);
+    }
+
+    @Test
+    @Config(qualifiers = "mcc999")
+    public void isAvailable_withConfigNoShow_returnUnsupported() {
+        assertThat(mController.isAvailable()).isFalse();
+    }
+
+    @Test
+    public void isAvailable_refreshRateLargerThanDefault_returnTrue() {
+        mController.mPeakRefreshRate = DEFAULT_REFRESH_RATE + 1;
+
+        assertThat(mController.isAvailable()).isTrue();
+    }
+
+    @Test
+    public void getAvailabilityStatus_refreshRateEqualToDefault_returnFalse() {
+        mController.mPeakRefreshRate = DEFAULT_REFRESH_RATE;
+
+        assertThat(mController.isAvailable()).isFalse();
+    }
+
+    @Test
+    public void onDeveloperOptionsDisabled_shouldDisablePreference() {
+        mController.onDeveloperOptionsSwitchDisabled();
+
+        assertThat(Settings.System.getFloat(mContext.getContentResolver(),
+                Settings.System.MIN_REFRESH_RATE, -1f)).isEqualTo(NO_CONFIG);
+        assertThat(mPreference.isChecked()).isFalse();
+        assertThat(mPreference.isEnabled()).isFalse();
+    }
+}