public void CreateExpressionTest1()
{
// Arrange
var parameterExpression = Expression.Parameter(typeof(Employee), "sample");
var expressionProperty = Expression.Property(parameterExpression, nameof(Employee.FirstName));
var containsOperator = new ContainsOperator();
Expression leftExpression = containsOperator.CreateExpression(expressionProperty, Expression.Constant("xxx"));
Expression rightExpression = containsOperator.CreateExpression(expressionProperty, Expression.Constant("yyy"));
Expression expectedExpression = Expression.And(leftExpression, rightExpression);
var _operator = new AndOperator();
// Act
Expression resultExpression = _operator.CreateExpression(leftExpression, rightExpression);
// Assert
Assert.AreEqual(expectedExpression.ToString(), resultExpression.ToString(), "Expression not correct");
}
