Add more tests for the component and a custom robolectric test runner.
Bug: 140307166
Test: atest RunCarUiRoboTests
Change-Id: Ib1e8a2a8a565ee0b62d02188c5a621f07f2a231a
diff --git a/car-ui-lib/tests/robotests/src/com/android/car/ui/pagedrecyclerview/PagedSmoothScrollerTest.java b/car-ui-lib/tests/robotests/src/com/android/car/ui/pagedrecyclerview/PagedSmoothScrollerTest.java
new file mode 100644
index 0000000..126883e
--- /dev/null
+++ b/car-ui-lib/tests/robotests/src/com/android/car/ui/pagedrecyclerview/PagedSmoothScrollerTest.java
@@ -0,0 +1,68 @@
+/*
+ * 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);
+ }
+}