content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you 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 org.apache.causeway.commons.collections;
  
  import java.util.List;
  
  import java.util.Locale;
  
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import org.apache.causeway.commons.internal.collections._Lists;
  
  class CanCompareTest {
  
      // in natural order
      private List<Can<String>> samples = _Lists.ofNullable(
              null,
              Can.empty(),
              Can.<String>of("hi"),
              Can.<String>of("hi", "there"),
              Can.<String>of("hi", "there", "world"),
              Can.<String>of("hi", "there", "zzz"),
              Can.<String>of("hi", "zzz", "world")
              );
  
      private final int x = 99; // n/a
  
      //  left arg in row
      // right arg in col
      private final int[][] expectationMatrix = {
              {x, x, x, x, x, x, x},
              {0, 0,-1,-1,-1,-1,-1},
              {1, 1, 0,-1,-1,-1,-1},
              {1, 1, 1, 0,-1,-1,-1},
              {1, 1, 1, 1, 0,-1,-1},
              {1, 1, 1, 1, 1, 0,-1},
              {1, 1, 1, 1, 1, 1, 0},
      };
  
      @Test
      void cans_shouldCompareCorrectly() {
  
          int row = 0;
          for(Can<String> left : samples) {
              int col = 0;
              for(Can<String> right : samples) {
                  // skip first row // as first argument is null and cannot be used
                  if(row>0) {
  
                      int c = left.compareTo(right);
                      if(c>0) {
                          c = 1;
                      } else if(c<0) {
                          c = -1;
                      }
                      assertEquals(expectationMatrix[row][col], c,
                              String.format(Locale.US, "failed in (row, col) (%d, %d) with (%s, %s)",
                                      row, col, left, right));
                  }
                  ++col;
              }
              ++row;
          }
      }
  
  }
  