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  package org.apache.cayenne.exp.parser;
  
  import org.apache.cayenne.exp.Expression;
  import org.apache.cayenne.exp.ExpressionException;
  import org.apache.cayenne.exp.ExpressionFactory;
  import org.junit.Test;
  
  import java.util.List;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertThrows;
  import static org.junit.Assert.assertTrue;
  
  public class ASTCustomAggregateTest {
  
      @Test
      public void parse() {
          Expression exp = ExpressionFactory.exp("agg('quantile', value, 0.3)");
  
          assertTrue(exp instanceof ASTCustomAggregate);
          assertEquals("agg(\"quantile\", value, 0.3)", exp.toString());
      }
  
      @Test
      public void customAggregateAsFunctionArg() {
          Expression exp = ExpressionFactory.exp("fn('format_quantile', agg('quantile', value, 0.3))");
  
          assertTrue(exp instanceof ASTCustomFunction);
          assertEquals("fn(\"format_quantile\", agg(\"quantile\", value, 0.3))", exp.toString());
      }
  
      @Test
      public void evaluate() {
          assertThrows(ExpressionException.class, () -> new ASTCustomAggregate("test").evaluate(new Object()));
          assertThrows(UnsupportedOperationException.class, () -> new ASTCustomAggregate("test").evaluateCollection(List.of()));
      }
  }