Add test for DisplayDensityUtil

/*

 * Copyright 2025 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.

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package com.android.settingslib.display;

import static com.google.common.truth.Truth.assertThat;

import static org.mockito.ArgumentMatchers.anyInt;

import static org.mockito.ArgumentMatchers.anyString;

import static org.mockito.Mockito.any;

import static org.mockito.Mockito.doReturn;

import static org.mockito.Mockito.when;

import android.content.Context;

import android.content.res.Resources;

import android.hardware.display.DisplayManager;

import android.hardware.display.DisplayManagerGlobal;

import android.os.RemoteException;

import android.view.Display;

import android.view.DisplayAdjustments;

import android.view.DisplayInfo;

import android.view.IWindowManager;

import android.view.WindowManagerGlobal;

import androidx.test.ext.junit.runners.AndroidJUnit4;

import com.android.settingslib.R;

import org.junit.After;

import org.junit.Before;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.mockito.Mock;

import org.mockito.MockitoAnnotations;

@RunWith(AndroidJUnit4.class)

public class DisplayDensityUtilsTest {

    private static final float MAX_SCALE = 1.33f;

    private static final float MIN_SCALE = 0.85f;

    private static final float MIN_INTERVAL = 0.09f;

    @Mock

    private Context mContext;

    @Mock

    private Resources mResources;

    @Mock

    private DisplayManager mDisplayManager;

    @Mock

    private DisplayManagerGlobal mDisplayManagerGlobal;

    @Mock

    private IWindowManager mIWindowManager;

    private IWindowManager mWindowManagerToRestore;

    private DisplayDensityUtils mDisplayDensityUtils;

    @Before

    public void setUp() {

        MockitoAnnotations.initMocks(this);

        doReturn(mDisplayManager).when(mContext).getSystemService((Class<Object>) any());

        mWindowManagerToRestore = WindowManagerGlobal.getWindowManagerService();

        WindowManagerGlobal.setWindowManagerServiceForSystemProcess(mIWindowManager);

        when(mContext.getResources()).thenReturn(mResources);

        when(mResources.getFraction(R.fraction.display_density_max_scale, 1, 1)).thenReturn(

                MAX_SCALE);

        when(mResources.getFraction(R.fraction.display_density_min_scale, 1, 1)).thenReturn(

                MIN_SCALE);

        when(mResources.getFraction(R.fraction.display_density_min_scale_interval, 1,

                1)).thenReturn(MIN_INTERVAL);

        when(mResources.getString(anyInt())).thenReturn("summary");

    }

    @After

    public void teardown() {

        WindowManagerGlobal.setWindowManagerServiceForSystemProcess(mWindowManagerToRestore);

    }

    @Test

    public void createDisplayDensityUtil_onlyDefaultDisplay() throws RemoteException {

        var info = createDisplayInfoForDisplay(Display.DEFAULT_DISPLAY, Display.TYPE_INTERNAL, 2560,

                1600, 320);

        var display = new Display(mDisplayManagerGlobal, info.displayId, info,

                (DisplayAdjustments) null);

        doReturn(new Display[]{display}).when(mDisplayManager).getDisplays(any());

        doReturn(display).when(mDisplayManager).getDisplay(info.displayId);

        mDisplayDensityUtils = new DisplayDensityUtils(mContext);

        assertThat(mDisplayDensityUtils.getValues()).isEqualTo(new int[]{272, 320, 354, 390, 424});

    }

    @Test

    public void createDisplayDensityUtil_multipleInternalDisplays() throws RemoteException {

        // Default display

        var defaultDisplayInfo = createDisplayInfoForDisplay(Display.DEFAULT_DISPLAY,

                Display.TYPE_INTERNAL, 2000, 2000, 390);

        var defaultDisplay = new Display(mDisplayManagerGlobal, defaultDisplayInfo.displayId,

                defaultDisplayInfo,

                (DisplayAdjustments) null);

        doReturn(defaultDisplay).when(mDisplayManager).getDisplay(defaultDisplayInfo.displayId);

        // Create another internal display

        var internalDisplayInfo = createDisplayInfoForDisplay(1, Display.TYPE_INTERNAL,

                2000, 1000, 390);

        var internalDisplay = new Display(mDisplayManagerGlobal, internalDisplayInfo.displayId,

                internalDisplayInfo,

                (DisplayAdjustments) null);

        doReturn(internalDisplay).when(mDisplayManager).getDisplay(internalDisplayInfo.displayId);

        doReturn(new Display[]{defaultDisplay, internalDisplay}).when(mDisplayManager).getDisplays(

                anyString());

        mDisplayDensityUtils = new DisplayDensityUtils(mContext);

        assertThat(mDisplayDensityUtils.getValues()).isEqualTo(new int[]{330, 390, 426, 462, 500});

    }

    private DisplayInfo createDisplayInfoForDisplay(int displayId, int displayType,

            int width, int height, int density) throws RemoteException {

        var displayInfo = new DisplayInfo();

        displayInfo.displayId = displayId;

        displayInfo.type = displayType;

        displayInfo.logicalWidth = width;

        displayInfo.logicalHeight = height;

        displayInfo.logicalDensityDpi = density;

        doReturn(displayInfo).when(mDisplayManagerGlobal).getDisplayInfo(displayInfo.displayId);

        doReturn(displayInfo.logicalDensityDpi).when(mIWindowManager).getInitialDisplayDensity(

                displayInfo.displayId);

        return displayInfo;

    }

}