| /* |
| * Copyright 2019 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.car.ui.pagedrecyclerview; |
| |
| import static androidx.recyclerview.widget.LinearSmoothScroller.SNAP_TO_START; |
| |
| import static com.google.common.truth.Truth.assertThat; |
| |
| import android.content.Context; |
| |
| import com.android.car.ui.CarUiRobolectricTestRunner; |
| |
| import org.junit.Before; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.robolectric.RuntimeEnvironment; |
| |
| @RunWith(CarUiRobolectricTestRunner.class) |
| public class PagedSmoothScrollerTest { |
| |
| private Context mContext; |
| private PagedSmoothScroller mPagedSmoothScroller; |
| |
| @Before |
| public void setUp() { |
| mContext = RuntimeEnvironment.application; |
| mPagedSmoothScroller = new PagedSmoothScroller(mContext); |
| } |
| |
| @Test |
| public void calculateTimeForScrolling_shouldInitializeAllValues() { |
| assertThat(mPagedSmoothScroller.mMillisecondsPerInch).isNotEqualTo(0); |
| assertThat(mPagedSmoothScroller.mDecelerationTimeDivisor).isNotEqualTo(0); |
| assertThat(mPagedSmoothScroller.mMillisecondsPerPixel).isNotEqualTo(0); |
| assertThat(mPagedSmoothScroller.mInterpolator).isNotNull(); |
| assertThat(mPagedSmoothScroller.mDensityDpi).isNotEqualTo(0); |
| } |
| |
| @Test |
| public void getVerticalSnapPreference_shouldReturnSnapToStart() { |
| assertThat(mPagedSmoothScroller.getVerticalSnapPreference()).isEqualTo(SNAP_TO_START); |
| } |
| |
| @Test |
| public void calculateTimeForScrolling_shouldReturnMultiplierOfMillisecondsPerPixel() { |
| assertThat(mPagedSmoothScroller.calculateTimeForScrolling(20)).isEqualTo( |
| (int) Math.ceil(Math.abs(20) * mPagedSmoothScroller.mMillisecondsPerPixel)); |
| } |
| |
| @Test |
| public void calculateTimeForDeceleration_shouldReturnNotBeZero() { |
| assertThat(mPagedSmoothScroller.calculateTimeForDeceleration(20)).isNotEqualTo(0); |
| } |
| } |