text: import pytest
  from ledgeroni import expression
  from ledgeroni.query import Or, And, Not, RegexQuery, PayeeQuery
  
  
  def test_tokenize_expression():
      expr = 'not (Expense and Reddit) or Asset'
      tokens = list(expression.tokenize_expression(expr))
      assert tokens == [
          'not', '(', 'Expense', 'and', 'Reddit', ')', 'or', 'Asset']
  
  
  class TestBuildPostfixExpression:
      def test_and(self):
          expr = 'x and y'
          postfix = list(expression.build_postfix_expression(expr))
          assert postfix == ['x', 'y', 'and']
  
          expr = 'x and y and z'
          postfix = list(expression.build_postfix_expression(expr))
          assert postfix == ['x', 'y', 'and', 'z', 'and']
  
      def test_or(self):
          expr = 'x or y or z'
          postfix = list(expression.build_postfix_expression(expr))
          assert postfix == ['x', 'y', 'or', 'z', 'or']
  
      def test_not(self):
          expr = 'not x'
          postfix = list(expression.build_postfix_expression(expr))
          assert postfix == ['x', 'not']
  
      def test_payee(self):
          expr = 'payee x'
          postfix = list(expression.build_postfix_expression(expr))
          assert postfix == ['x', 'payee']
  
      def test_unary_precedence(self):
          expr = 'not payee x'
          postfix = list(expression.build_postfix_expression(expr))
          assert postfix == ['x', 'payee', 'not']
  
      def test_payee_at(self):
          expr = '@x'
          postfix = list(expression.build_postfix_expression(expr))
          assert postfix == ['x', '@']
  
      def test_precedence(self):
          expr = 'not x and y'
          postfix = list(expression.build_postfix_expression(expr))
          assert postfix == ['x', 'not', 'y', 'and']
  
      def test_parens(self):
          expr = 'not (x and y)'
          postfix = list(expression.build_postfix_expression(expr))
          assert postfix == ['x', 'y', 'and', 'not']
  
      def test_implicit_or(self):
          expr = 'x y'
          postfix = list(expression.build_postfix_expression(expr))
          assert postfix == ['x', 'y', 'or']
  
          expr = 'x y z'
          postfix = list(expression.build_postfix_expression(expr))
          assert postfix == ['x', 'y', 'or', 'z', 'or']
  
          expr = '(x y) z'
          postfix = list(expression.build_postfix_expression(expr))
          assert postfix == ['x', 'y', 'or', 'z', 'or']
  
          expr = 'x (y or z)'
          postfix = list(expression.build_postfix_expression(expr))
          assert postfix == ['x', 'y', 'z', 'or', 'or']
  
  
  class TestBuildExprFromPostfix:
      def test_binary(self):
          postfix = ['x', 'y', 'or']
          result = expression.build_expr_from_postfix(postfix)
          query = Or((RegexQuery.from_string('y'),
                      RegexQuery.from_string('x')))
  
          assert result == query
  
          postfix = ['x', 'y', 'and']
          result = expression.build_expr_from_postfix(postfix)
          query = And((RegexQuery.from_string('y'),
                       RegexQuery.from_string('x')))
  
          assert result == query
  
      def test_unary(self):
          postfix = ['x', 'not']
          result = expression.build_expr_from_postfix(postfix)
          query = Not(RegexQuery.from_string('x'))
  
          assert result == query
  
      def test_single(self):
          postfix = ['x']
          result = expression.build_expr_from_postfix(postfix)
          query = RegexQuery.from_string('x')
  
          assert result == query
  
      def test_payee(self):
          postfix = ['x', 'payee']
          result = expression.build_expr_from_postfix(postfix)
          query = PayeeQuery(RegexQuery.from_string('x'))
  
          assert result == query
  
      def test_payee_at(self):
          postfix = ['x', '@']
          result = expression.build_expr_from_postfix(postfix)
          query = PayeeQuery(RegexQuery.from_string('x'))
  
          assert result == query
  
      def test_payee_validation(self):
          postfix = ['x', 'not', '@']
          with pytest.raises(ValueError):
              expression.build_expr_from_postfix(postfix)
  
      def test_precedence(self):
          postfix = ['y', 'not', 'x', '@', 'and']
          result = expression.build_expr_from_postfix(postfix)
          query = And((PayeeQuery(RegexQuery.from_string('x')),
                       Not(RegexQuery.from_string('y'))))
  
          assert result == query
  
  
  class TestBuildExpression:
      def test_binary(self):
          postfix = 'x or y'
          result = expression.build_expression(postfix)
          query = Or((RegexQuery.from_string('y'),
                      RegexQuery.from_string('x')))
  
          assert result == query
  
          postfix = 'x and y'
          result = expression.build_expression(postfix)
          query = And((RegexQuery.from_string('y'),
                       RegexQuery.from_string('x')))
  
          assert result == query
  
      def test_unary(self):
          postfix = 'not x'
          result = expression.build_expression(postfix)
          query = Not(RegexQuery.from_string('x'))
  
          assert result == query
  
      def test_single(self):
          postfix = 'x'
          result = expression.build_expression(postfix)
          query = RegexQuery.from_string('x')
  
          assert result == query
  
      def test_implicit_or(self):
          postfix = 'x y'
          result = expression.build_expression(postfix)
          query = Or((RegexQuery.from_string('y'),
                      RegexQuery.from_string('x')))
  
          assert result == query
  
  