text: // expression_parser_test.cpp
  
  /**
   *    Copyright (C) 2013 10gen Inc.
   *
   *    This program is free software: you can redistribute it and/or  modify
   *    it under the terms of the GNU Affero General Public License, version 3,
   *    as published by the Free Software Foundation.
   *
   *    This program is distributed in the hope that it will be useful,
   *    but WITHOUT ANY WARRANTY; without even the implied warranty of
   *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *    GNU Affero General Public License for more details.
   *
   *    You should have received a copy of the GNU Affero General Public License
   *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  #include "mongo/unittest/unittest.h"
  
  #include "mongo/db/matcher/expression_parser.h"
  
  #include "mongo/db/jsobj.h"
  #include "mongo/db/json.h"
  #include "mongo/db/matcher/expression.h"
  #include "mongo/db/matcher/expression_leaf.h"
  
  namespace mongo {
  
      TEST( MatchExpressionParserTest, SimpleEQ1 ) {
          BSONObj query = BSON( "x" << 2 );
          StatusWithMatchExpression result = MatchExpressionParser::parse( query );
          ASSERT_TRUE( result.isOK() );
  
          ASSERT( result.getValue()->matchesBSON( BSON( "x" << 2 ) ) );
          ASSERT( !result.getValue()->matchesBSON( BSON( "x" << 3 ) ) );
      }
  
      TEST( MatchExpressionParserTest, Multiple1 ) {
          BSONObj query = BSON( "x" << 5 << "y" << BSON( "$gt" << 5 << "$lt" << 8 ) );
          StatusWithMatchExpression result = MatchExpressionParser::parse( query );
          ASSERT_TRUE( result.isOK() );
  
          ASSERT( result.getValue()->matchesBSON( BSON( "x" << 5 << "y" << 7 ) ) );
          ASSERT( result.getValue()->matchesBSON( BSON( "x" << 5 << "y" << 6 ) ) );
          ASSERT( !result.getValue()->matchesBSON( BSON( "x" << 6 << "y" << 7 ) ) );
          ASSERT( !result.getValue()->matchesBSON( BSON( "x" << 5 << "y" << 9 ) ) );
          ASSERT( !result.getValue()->matchesBSON( BSON( "x" << 5 << "y" << 4 ) ) );
      }
  
      TEST( AtomicMatchExpressionTest, Simple1 ) {
          BSONObj query = BSON( "x" << 5 << "$atomic" << BSON( "$gt" << 5 << "$lt" << 8 ) );
          StatusWithMatchExpression result = MatchExpressionParser::parse( query );
          ASSERT_TRUE( result.isOK() );
  
          query = BSON( "x" << 5 << "$isolated" << 1 );
          result = MatchExpressionParser::parse( query );
          ASSERT_TRUE( result.isOK() );
  
          query = BSON( "x" << 5 << "y" << BSON( "$isolated" << 1 ) );
          result = MatchExpressionParser::parse( query );
          ASSERT_FALSE( result.isOK() );
      }
  
      StatusWith<int> fib( int n ) {
          if ( n < 0 ) return StatusWith<int>( ErrorCodes::BadValue, "paramter to fib has to be >= 0" );
          if ( n <= 1 ) return StatusWith<int>( 1 );
          StatusWith<int> a = fib( n - 1 );
          StatusWith<int> b = fib( n - 2 );
          if ( !a.isOK() ) return a;
          if ( !b.isOK() ) return b;
          return StatusWith<int>( a.getValue() + b.getValue() );
      }
  
      TEST( StatusWithTest, Fib1 ) {
          StatusWith<int> x = fib( -2 );
          ASSERT( !x.isOK() );
  
          x = fib(0);
          ASSERT( x.isOK() );
          ASSERT( 1 == x.getValue() );
  
          x = fib(1);
          ASSERT( x.isOK() );
          ASSERT( 1 == x.getValue() );
  
          x = fib(2);
          ASSERT( x.isOK() );
          ASSERT( 2 == x.getValue() );
  
          x = fib(3);
          ASSERT( x.isOK() );
          ASSERT( 3 == x.getValue() );
  
  
      }
  }
  