camera/camera-camera2-pipe-integration/src/test/java/androidx/camera/camera2/pipe/integration/impl/DisplayInfoManagerTest.kt

/*
 * Copyright 2022 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 androidx.camera.camera2.pipe.integration.impl

import android.content.Context
import android.graphics.Point
import android.hardware.display.DisplayManager
import android.util.Size
import androidx.test.core.app.ApplicationProvider
import org.junit.Assert.assertEquals
import org.junit.Test
import org.junit.runner.RunWith
import org.robolectric.RobolectricTestRunner
import org.robolectric.annotation.internal.DoNotInstrument
import org.robolectric.shadows.ShadowDisplayManager

@Suppress("DEPRECATION") // getRealSize
@RunWith(RobolectricTestRunner::class)
@DoNotInstrument
class DisplayInfoManagerTest {
    private val displayInfoManager = DisplayInfoManager(ApplicationProvider.getApplicationContext())

    private fun addDisplay(width: Int, height: Int) {
        ShadowDisplayManager.addDisplay(String.format("w%ddp-h%ddp", width, height))
    }

    @Test
    fun defaultDisplayIsDeviceDisplay_whenOneDisplay() {
        // Arrange
        val displayManager = (ApplicationProvider.getApplicationContext() as Context)
            .getSystemService(Context.DISPLAY_SERVICE) as DisplayManager
        val currentDisplaySize = Point()
        displayManager.displays[0].getRealSize(currentDisplaySize)

        // Act
        val size = Point()
        displayInfoManager.defaultDisplay.getRealSize(size)

        // Assert
        assertEquals(currentDisplaySize, size)
    }

    @Test
    fun defaultDisplayIsMaxSizeDisplay_whenMultipleDisplay() {
        // Arrange
        addDisplay(2000, 3000)
        addDisplay(480, 640)

        // Act
        val size = Point()
        displayInfoManager.defaultDisplay.getRealSize(size)

        // Assert
        assertEquals(Point(2000, 3000), size)
    }

    @Test(expected = IllegalStateException::class)
    fun throwsCorrectExceptionForDefaultDisplay_whenNoDisplay() {
        // Arrange
        ShadowDisplayManager.removeDisplay(0)

        // Act
        val size = Point()
        displayInfoManager.defaultDisplay.getRealSize(size)
    }

    @Test
    fun previewSizeIsProperSize_whenDisplaySmallerThan1080P() {
        // Arrange
        addDisplay(480, 640)

        // Act & Assert
        assertEquals(Size(640, 480), displayInfoManager.previewSize)
    }

    @Test
    fun previewSizeIsMaxPreviewSize_whenDisplayLargerThan1080P() {
        // Arrange
        addDisplay(2000, 3000)

        // Act & Assert
        assertEquals(Size(1920, 1080), displayInfoManager.previewSize)
    }
}