[Test Week] Add SystemUiControllerTest

/*

 * Copyright (C) 2024 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.launcher3.util

import android.view.View

import android.view.View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN

import android.view.Window

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

import androidx.test.filters.SmallTest

import com.android.launcher3.util.SystemUiController.FLAG_DARK_NAV

import com.android.launcher3.util.SystemUiController.FLAG_DARK_STATUS

import com.android.launcher3.util.SystemUiController.FLAG_LIGHT_NAV

import com.android.launcher3.util.SystemUiController.FLAG_LIGHT_STATUS

import com.android.launcher3.util.SystemUiController.UI_STATE_BASE_WINDOW

import com.android.launcher3.util.SystemUiController.UI_STATE_SCRIM_VIEW

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

import org.junit.Before

import org.junit.Test

import org.junit.runner.RunWith

import org.mockito.ArgumentMatchers.anyInt

import org.mockito.ArgumentMatchers.eq

import org.mockito.Mock

import org.mockito.Mockito.never

import org.mockito.Mockito.verify

import org.mockito.Mockito.`when`

import org.mockito.MockitoAnnotations

@SmallTest

@RunWith(AndroidJUnit4::class)

class SystemUiControllerTest {

    @Mock private lateinit var window: Window

    @Mock private lateinit var decorView: View

    private lateinit var underTest: SystemUiController

    @Before

    fun setup() {

        MockitoAnnotations.initMocks(this)

        `when`(window.decorView).thenReturn(decorView)

        underTest = SystemUiController(window)

    }

    @Test

    fun test_default_state() {

        assertThat(underTest.toString()).isEqualTo("mStates=[0, 0, 0, 0, 0]")

    }

    @Test

    fun update_state_base_window_light() {

        underTest.updateUiState(UI_STATE_BASE_WINDOW, /* isLight= */ true)

        val visibility =

            View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR or View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR

        verify(decorView).systemUiVisibility = eq(visibility)

        assertThat(underTest.baseSysuiVisibility).isEqualTo(visibility)

        val flag = FLAG_LIGHT_NAV or FLAG_LIGHT_STATUS

        assertThat(underTest.toString()).isEqualTo("mStates=[$flag, 0, 0, 0, 0]")

    }

    @Test

    fun update_state_scrim_view_light() {

        underTest.updateUiState(UI_STATE_SCRIM_VIEW, /* isLight= */ true)

        verify(decorView).systemUiVisibility =

            eq(View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR or View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR)

        assertThat(underTest.baseSysuiVisibility).isEqualTo(0)

        val flag = FLAG_LIGHT_NAV or FLAG_LIGHT_STATUS

        assertThat(underTest.toString()).isEqualTo("mStates=[0, $flag, 0, 0, 0]")

    }

    @Test

    fun update_state_base_window_dark() {

        underTest.updateUiState(UI_STATE_BASE_WINDOW, /* isLight= */ false)

        verify(decorView, never()).systemUiVisibility = anyInt()

        assertThat(underTest.baseSysuiVisibility).isEqualTo(0)

        val flag = FLAG_DARK_NAV or FLAG_DARK_STATUS

        assertThat(underTest.toString()).isEqualTo("mStates=[$flag, 0, 0, 0, 0]")

    }

    @Test

    fun update_state_scrim_view_dark() {

        underTest.updateUiState(UI_STATE_SCRIM_VIEW, /* isLight= */ false)

        verify(decorView, never()).systemUiVisibility = anyInt()

        assertThat(underTest.baseSysuiVisibility).isEqualTo(0)

        val flag = FLAG_DARK_NAV or FLAG_DARK_STATUS

        assertThat(underTest.toString()).isEqualTo("mStates=[0, $flag, 0, 0, 0]")

    }

    @Test

    fun get_base_sysui_visibility() {

        `when`(decorView.systemUiVisibility).thenReturn(SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN)

        assertThat(underTest.baseSysuiVisibility).isEqualTo(SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN)

    }

    @Test

    fun update_state_base_window_light_with_existing_visibility() {

        `when`(decorView.systemUiVisibility).thenReturn(SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN)

        underTest.updateUiState(UI_STATE_BASE_WINDOW, /* isLight= */ true)

        val visibility =

            View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR or

                View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR or

                SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN

        assertThat(underTest.baseSysuiVisibility).isEqualTo(visibility)

        verify(decorView).systemUiVisibility = eq(visibility)

    }

}