tests/robotests/src/com/android/settings/MasterClearTest.java

/*
 * Copyright (C) 2016 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.settings;

import static com.google.common.truth.Truth.assertThat;
import static org.mockito.Mockito.when;

import android.widget.LinearLayout;
import android.widget.ScrollView;

import com.android.settings.testutils.SettingsRobolectricTestRunner;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
import org.robolectric.annotation.Config;

@RunWith(SettingsRobolectricTestRunner.class)
@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
public class MasterClearTest {
    private MasterClear mMasterClear;
    @Mock
    private ScrollView mScrollView;
    @Mock
    private LinearLayout mLinearLayout;

    @Before
    public void setUp() {
        MockitoAnnotations.initMocks(this);
        mMasterClear = new MasterClear();

        // Make scrollView only have one child
        when(mScrollView.getChildAt(0)).thenReturn(mLinearLayout);
        when(mScrollView.getChildCount()).thenReturn(1);
    }

    @Test
    public void testHasReachedBottom_NotScrollDown_returnFalse() {
        initScrollView(100, 0, 200);

        assertThat(mMasterClear.hasReachedBottom(mScrollView)).isFalse();
    }

    @Test
    public void testHasReachedBottom_CanNotScroll_returnTrue() {
        initScrollView(100, 0, 80);

        assertThat(mMasterClear.hasReachedBottom(mScrollView)).isTrue();
    }

    @Test
    public void testHasReachedBottom_ScrollToBottom_returnTrue() {
        initScrollView(100, 100, 200);

        assertThat(mMasterClear.hasReachedBottom(mScrollView)).isTrue();
    }

    private void initScrollView(int height, int scrollY, int childBottom) {
        when(mScrollView.getHeight()).thenReturn(height);
        when(mScrollView.getScrollY()).thenReturn(scrollY);
        when(mLinearLayout.getBottom()).thenReturn(childBottom);
    }
}