public void TestReplaceVariables()
{
var variable1 = new VariableExpression("variable1");
var variable2 = new VariableExpression("variable2");
var value1 = new IntegerConstantExpression(98);
var value2 = new IntegerConstantExpression(99);
var expr = new ConditionalExpression(variable1, ConditionalOperation.And, variable2);
var scope = new InterpreterScope();
scope.AssignVariable(variable1, value1);
scope.AssignVariable(variable2, value2);
ExpressionBase result;
Assert.That(expr.ReplaceVariables(scope, out result), Is.True);
Assert.That(result, Is.InstanceOf <ConditionalExpression>());
Assert.That(((ConditionalExpression)result).Left, Is.EqualTo(value1));
Assert.That(((ConditionalExpression)result).Operation, Is.EqualTo(expr.Operation));
Assert.That(((ConditionalExpression)result).Right, Is.EqualTo(value2));
}