content: package com.alibaba.druid.bvt.sql;
  
  import com.alibaba.druid.sql.ast.expr.SQLBooleanExpr;
  import com.alibaba.druid.sql.dialect.mysql.parser.MySqlExprParser;
  import com.alibaba.druid.sql.parser.SQLExprParser;
  import junit.framework.TestCase;
  
  import static org.junit.Assert.assertNotEquals;
  
  public class EqualTest_boolean extends TestCase {
      public void test_exits() throws Exception {
          String sql = "true";
          String sql_c = "false";
          SQLBooleanExpr exprA, exprB, exprC;
          {
              SQLExprParser parser = new MySqlExprParser(sql);
              exprA = (SQLBooleanExpr) parser.expr();
          }
          {
              SQLExprParser parser = new MySqlExprParser(sql);
              exprB = (SQLBooleanExpr) parser.expr();
          }
          {
              SQLExprParser parser = new MySqlExprParser(sql_c);
              exprC = (SQLBooleanExpr) parser.expr();
          }
          assertEquals(exprA, exprB);
          assertNotEquals(exprA, exprC);
          assertTrue(exprA.equals(exprA));
          assertFalse(exprA.equals(new Object()));
          assertEquals(exprA.hashCode(), exprB.hashCode());
  
          assertEquals(new SQLBooleanExpr(), new SQLBooleanExpr());
          assertEquals(new SQLBooleanExpr().hashCode(), new SQLBooleanExpr().hashCode());
      }
  }
  