com.trenako.results.PaginatedListsTests.java Source code

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Here is the source code for com.trenako.results.PaginatedListsTests.java

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/*
 * Copyright 2012 the original author or authors.
 * 
 * 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.trenako.results;

import static org.junit.Assert.*;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.junit.Test;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;

/**
 * 
 * @author Carlo Micieli
 *
 */
public class PaginatedListsTests {
    @Test
    public void shouldPaginateListOfValuesForPageInBetween() {
        Page<String> page = PaginatedLists.paginate(values(50), paging(3, 10));

        assertNotNull(page);
        assertTrue("Without a next page", page.hasNextPage());
        assertTrue("Without a previous page", page.hasPreviousPage());
        assertTrue("Without content", page.hasContent());

        assertEquals(50, page.getTotalElements());
        assertEquals(10, page.getContent().size());
        assertEquals("item21", page.getContent().get(0));
        assertEquals("item30", page.getContent().get(9));
    }

    @Test
    public void shouldPaginateListOfValuesForFirstPage() {
        Page<String> page = PaginatedLists.paginate(values(50), paging(1, 10));

        assertNotNull(page);
        assertFalse("With a previous page", page.hasPreviousPage());
        assertTrue("Without a next page", page.hasNextPage());
        assertTrue("Without content", page.hasContent());

        assertEquals(50, page.getTotalElements());
        assertEquals(10, page.getContent().size());
        assertEquals("item1", page.getContent().get(0));
        assertEquals("item10", page.getContent().get(9));
    }

    @Test
    public void shouldPaginateListOfValuesForLastPage() {
        Page<String> page = PaginatedLists.paginate(values(50), paging(5, 10));

        assertNotNull(page);
        assertFalse("With a next page", page.hasNextPage());
        assertTrue("Without a previous page", page.hasPreviousPage());
        assertTrue("Without content", page.hasContent());

        assertEquals(50, page.getTotalElements());
        assertEquals(10, page.getContent().size());
        assertEquals("item41", page.getContent().get(0));
        assertEquals("item50", page.getContent().get(9));
    }

    @Test
    public void shouldPaginateListOfValuesForLastPageWhenIncomplete() {
        Page<String> page = PaginatedLists.paginate(values(47), paging(5, 10));

        assertNotNull(page);
        assertFalse("With a next page", page.hasNextPage());
        assertTrue("Without a previous page", page.hasPreviousPage());
        assertTrue("Without content", page.hasContent());

        assertEquals(47, page.getTotalElements());
        assertEquals(7, page.getContent().size());
        assertEquals("item41", page.getContent().get(0));
        assertEquals("item47", page.getContent().get(6));
    }

    @Test
    public void shouldReturnEmptyPagesWhenPaginationIsOutOfBound() {
        Page<String> page = PaginatedLists.paginate(values(47), paging(8, 10));

        assertNotNull(page);
        assertEquals(0, page.getTotalElements());
        assertEquals(0, page.getContent().size());
    }

    private Pageable paging(int page, int size) {
        return new PageRequest(page - 1, size);
    }

    private List<String> values(int numberOfItems) {
        String[] arr = new String[numberOfItems];
        for (int i = 0; i < numberOfItems; i++) {
            arr[i] = "item" + (i + 1);
        }

        return new ArrayList<String>(Arrays.asList(arr));
    }
}