tobago-core/src/test/java/org/apache/myfaces/tobago/util/ValueExpressionComparatorUnitTest.java

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 * to you under the Apache License, Version 2.0 (the
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package org.apache.myfaces.tobago.util;

import org.apache.myfaces.test.el.MockValueExpression;
import org.apache.myfaces.tobago.internal.config.AbstractTobagoTestBase;
import org.apache.myfaces.tobago.internal.util.Fruit;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;

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

public class ValueExpressionComparatorUnitTest extends AbstractTobagoTestBase {

  @Test
  public void testComparingInstancesOfDifferentClasses() {

    final List<Fruit> original = Fruit.getFreshFruits();

    final ValueExpressionComparator ascendingComparator = new ValueExpressionComparator(
        facesContext, "var", new MockValueExpression("#{var.name}", String.class), false, null);
    final List<Fruit> ascending = new ArrayList<>(original);
    ascending.sort(ascendingComparator);

    Assertions.assertEquals(original.get(0), ascending.get(0), "#0");
    Assertions.assertEquals(original.get(3), ascending.get(1), "#1");
    Assertions.assertEquals(original.get(1), ascending.get(2), "#2");
    Assertions.assertEquals(original.get(2), ascending.get(3), "#3");

    final ValueExpressionComparator descendingComparator = new ValueExpressionComparator(
        facesContext, "var", new MockValueExpression("#{var.name}", String.class), true, null);

    final List<Fruit> descending = new ArrayList<>(original);
    descending.sort(descendingComparator);

    Assertions.assertEquals(original.get(2), descending.get(0), "#0");
    Assertions.assertEquals(original.get(1), descending.get(1), "#1");
    Assertions.assertEquals(original.get(3), descending.get(2), "#2");
    Assertions.assertEquals(original.get(0), descending.get(3), "#3");
  }
}