PaginatedResultTests.java

/*
 * 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.github.carlomicieli.nerdmovies.utility;

import com.github.carlomicieli.nerdmovies.models.Movie;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.runners.MockitoJUnitRunner;

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

import static org.junit.Assert.*;

/**
 * @author Carlo Micieli
 */
@RunWith(MockitoJUnitRunner.class)
public class PaginatedResultTests {

    @Test
    public void previousAndNextLinksAreNotShownForOnePageResult() {
        int page = 1;
        long nrOfElements = 2;

        List<Movie> movies = Arrays.asList(new Movie(), new Movie());
        PaginatedResult<Movie> pr = new PaginatedResult<Movie>(movies,
                nrOfElements,
                page);
        assertFalse(pr.showNextLink());
        assertFalse(pr.showPreviousLink());
    }

    @Test
    public void showNextLink() {

        PaginatedResult<Movie> pr = new PaginatedResult<Movie>(new ArrayList<Movie>(),
                16,
                1,
                2);
        assertFalse(pr.showPreviousLink());
        assertTrue(pr.showNextLink());
    }

    @Test
    public void showPreviousLink() {

        PaginatedResult<Movie> pr = new PaginatedResult<Movie>(new ArrayList<Movie>(),
                20,
                2,
                10);
        assertTrue(pr.showPreviousLink());
        assertFalse(pr.showNextLink());
    }

    @Test
    public void calculatingTheNumberOfPages() {
        PaginatedResult<Movie> pr = new PaginatedResult<Movie>(null, 100, 0, 25);
        assertEquals(4, pr.getPageCount());

        PaginatedResult<Movie> pr2 = new PaginatedResult<Movie>(null, 110, 0, 25);
        assertEquals(5, pr2.getPageCount());
    }

    @Test(expected = IllegalArgumentException.class)
    public void invalidPageSizeThrowsAnException() {
        int pageSize = 0;
        new PaginatedResult<Movie>(null, 100, 0, pageSize);
    }

    @Test
    public void pageLinksForOnePage() {
        int page = 1;
        long nrOfElements = 2;
        int pageSize = 25;

        List<Movie> movies = Arrays.asList(new Movie(), new Movie());

        PaginatedResult<Movie> pr = new PaginatedResult<Movie>(movies,
                nrOfElements,
                page,
                pageSize);

        assertEquals(1, pr.getFirstPageLink());
        assertEquals(1, pr.getLastPageLink());

        List<Integer> links = pr.getPageLinks();
        assertNotNull(links);
        assertEquals(1, links.size());

        List<Integer> expected = Arrays.asList(1);
        assertArrayEquals(expected.toArray(), links.toArray());
    }

    @Test
    public void paginateResultForTheOnePage() {
        int page = 1;
        long nrOfElements = 25;
        int pageSize = 25;

        PaginatedResult<Movie> pr = new PaginatedResult<Movie>(new ArrayList<Movie>(),
                nrOfElements,
                page,
                pageSize);

        List<Movie> movies = pr.getData();
        assertNotNull("Movies list is empty", movies);
        assertEquals(1, pr.getPage());
        assertEquals(25, pr.getNrOfElements());
        assertEquals(true, pr.isFirstPage());
        assertEquals(true, pr.isLastPage());
    }

    @Test
    public void paginateResultForTheLastPage() {
        int page = 5;
        long nrOfElements = 110;
        int pageSize = 25;

        PaginatedResult<Movie> pr = new PaginatedResult<Movie>(new ArrayList<Movie>(),
                nrOfElements,
                page,
                pageSize);

        List<Movie> movies = pr.getData();
        assertNotNull("Movies list is empty", movies);
        assertEquals(5, pr.getPage());
        assertEquals(110, pr.getNrOfElements());
        assertEquals(false, pr.isFirstPage());
        assertEquals(true, pr.isLastPage());
    }

    @Test
    public void paginateResultForTheMiddlePage() {
        int page = 3;
        long nrOfElements = 110;
        int pageSize = 25;

        PaginatedResult<Movie> pr = new PaginatedResult<Movie>(new ArrayList<Movie>(),
                nrOfElements,
                page,
                pageSize);

        List<Movie> movies = pr.getData();
        assertNotNull("Movies list is empty", movies);
        assertEquals(3, pr.getPage());
        assertEquals(110, pr.getNrOfElements());
        assertEquals(false, pr.isFirstPage());
        assertEquals(false, pr.isLastPage());
    }

    @Test
    public void linksPageNumberForFirst10Pages() {
        int page = 3;
        long nrOfElements = 200;
        int pageSize = 10;

        PaginatedResult<Movie> pr = new PaginatedResult<Movie>(new ArrayList<Movie>(),
                nrOfElements,
                page,
                pageSize);
        assertEquals(3, pr.getPage());
        assertEquals(20, pr.getPageCount());
        assertEquals(1, pr.getFirstPageLink());
        assertEquals(10, pr.getLastPageLink());
        List<Integer> pageLinks = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
        assertEquals(pageLinks, pr.getPageLinks());
    }

    @Test
    public void linksPageNumberForTheMiddlePages() {
        int page = 10;
        long nrOfElements = 200;
        int pageSize = 10;

        PaginatedResult<Movie> pr = new PaginatedResult<Movie>(new ArrayList<Movie>(),
                nrOfElements,
                page,
                pageSize);
        assertEquals(10, pr.getPage());
        assertEquals(20, pr.getPageCount());
        assertEquals(4, pr.getFirstPageLink());
        assertEquals(13, pr.getLastPageLink());
        List<Integer> pageLinks = Arrays.asList(4, 5, 6, 7, 8, 9, 10, 11, 12, 13);
        assertEquals(pageLinks, pr.getPageLinks());
    }

    @Test
    public void linksPageNumberForLast10Pages() {
        int page = 17;
        long nrOfElements = 200;
        int pageSize = 10;

        PaginatedResult<Movie> pr = new PaginatedResult<Movie>(new ArrayList<Movie>(),
                nrOfElements,
                page,
                pageSize);
        assertEquals(17, pr.getPage());
        assertEquals(20, pr.getPageCount());
        assertEquals(11, pr.getFirstPageLink());
        assertEquals(20, pr.getLastPageLink());
        List<Integer> pageLinks = Arrays.asList(11, 12, 13, 14, 15, 16, 17, 18, 19, 20);
        assertEquals(pageLinks, pr.getPageLinks());
    }
}