code: /**
   * This file is part of Eclipse Steady.
   *
   * 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.
   *
   * SPDX-License-Identifier: Apache-2.0
   * SPDX-FileCopyrightText: Copyright (c) 2018-2020 SAP SE or an SAP affiliate company and Eclipse Steady contributors
   */
  package org.eclipse.steady.backend.component;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Set;
  
  import org.junit.Test;
  
  public class ApplicationExporterTest {
  
    @Test
    public void testPartition() {
      // 1x10
      Set<List<Integer>> parts = ApplicationExporter.partition(this.createList(10), 1);
      int num = 0;
      assertEquals(1, parts.size());
      assertEquals(10, parts.iterator().next().size());
  
      // 0
      parts = ApplicationExporter.partition(null, 10);
      num = 0;
      assertEquals(0, parts.size());
      for (List<Integer> part : parts) {
        assertTrue(false);
      }
      assertEquals(0, num);
  
      // 1x0
      parts = ApplicationExporter.partition(this.createList(0), 10);
      num = 0;
      assertEquals(1, parts.size());
      for (List<Integer> part : parts) {
        assertTrue(part.size() == 0);
        num += part.size();
      }
      assertEquals(0, num);
  
      // 1x1
      parts = ApplicationExporter.partition(this.createList(1), 10);
      num = 0;
      assertEquals(1, parts.size());
      for (List<Integer> part : parts) {
        assertTrue(part.size() == 1);
        num += part.size();
      }
      assertEquals(1, num);
  
      // 1x2
      parts = ApplicationExporter.partition(this.createList(2), 10);
      num = 0;
      assertEquals(1, parts.size());
      for (List<Integer> part : parts) {
        assertTrue(part.size() == 2);
        num += part.size();
      }
      assertEquals(2, num);
  
      // 10x1
      parts = ApplicationExporter.partition(this.createList(10), 10);
      num = 0;
      assertEquals(10, parts.size());
      for (List<Integer> part : parts) {
        assertTrue(part.size() == 1);
        num += part.size();
      }
      assertEquals(10, num);
  
      // 5x2
      parts = ApplicationExporter.partition(this.createList(10), 5);
      num = 0;
      assertEquals(5, parts.size());
      for (List<Integer> part : parts) {
        assertTrue(part.size() == 2);
        num += part.size();
      }
      assertEquals(10, num);
  
      // 4x2 + 1x3 = 11
      parts = ApplicationExporter.partition(this.createList(11), 5);
      num = 0;
      assertEquals(5, parts.size());
      for (List<Integer> part : parts) {
        assertTrue(part.size() == 2 || part.size() == 3);
        num += part.size();
      }
      assertEquals(11, num);
  
      // 4x2 + 1x4
      parts = ApplicationExporter.partition(this.createList(12), 5);
      num = 0;
      assertEquals(5, parts.size());
      for (List<Integer> part : parts) {
        assertTrue(part.size() == 2 || part.size() == 4);
        num += part.size();
      }
      assertEquals(12, num);
  
      // 39x28 + 1x38 = 1030
      parts = ApplicationExporter.partition(this.createList(1130), 40);
      num = 0;
      assertEquals(40, parts.size());
      for (List<Integer> part : parts) {
        assertTrue(part.size() == 28 || part.size() == 38);
        num += part.size();
      }
      assertEquals(1130, num);
    }
  
    private List<Integer> createList(int _size) {
      final List<Integer> l = new LinkedList<Integer>();
      for (int i = 0; i < _size; i++) l.add(i);
      return l;
    }
  }
  