content: package io.agrest.exp.parser;
  
  import io.agrest.AgException;
  import io.agrest.protocol.Exp;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.CsvSource;
  import org.junit.jupiter.params.provider.ValueSource;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  public class ExpUpperTest {
  
      @ParameterizedTest
      @ValueSource(strings = {
              "upper(a)",
              "upper ( a )",
              "upper('a')"
      })
      public void parse(String expString) {
          assertEquals(ExpUpper.class, Exp.parse(expString).getClass());
      }
  
      @ParameterizedTest
      @CsvSource(delimiter = '|', value = {
              "upper(a)|upper(a)",
              "upper ( a )|upper(a)"
      })
      public void parsedToString(String expString, String expected) {
          assertEquals(expected, Exp.parse(expString).toString());
      }
  
      @ParameterizedTest
      @ValueSource(strings = {
              "upper()",
              "upper(1)",
              "upper($a)",
              "UPPER(a)"
      })
      public void parseInvalidGrammar(String expString) {
          assertThrows(AgException.class, () -> Exp.parse(expString));
      }
  }
  