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alielie

2026-09-10 9ec80cafc23f5ee3278cacce3c9f86f4087b435a

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using System;
using DynamicExpresso.Exceptions;
using NUnit.Framework;
 
namespace DynamicExpresso.UnitTest
{
    [TestFixture]
    public class InvalidExpressionTest
    {
        [Test]
        public void Not_existing_variable()
        {
            var target = new Interpreter();
 
            Assert.Throws<UnknownIdentifierException>(() => target.Eval("not_existing"));
        }
 
        [Test]
        public void Invalid_equal_assignment_operator_left()
        {
            var target = new Interpreter();
 
            Assert.Throws<ParseException>(() => target.Eval("=234"));
        }
 
        [Test]
        public void Invalid_equal_assignment_operator_left_is_literal()
        {
            var target = new Interpreter();
 
            Assert.Throws<ParseException>(() => target.Eval("352=234"));
        }
 
        [Test]
        public void Unkonwn_operator_triple_equal()
        {
            var target = new Interpreter();
 
            Assert.Throws<ParseException>(() => target.Eval("352===234"));
        }
 
        [Test]
        public void Not_existing_function()
        {
            var target = new Interpreter();
 
            Assert.Throws<UnknownIdentifierException>(() => target.Eval("pippo()"));
        }
 
        [Test]
        public void Not_valid_function()
        {
            var target = new Interpreter();
 
            
            Assert.Throws<ParseException>(() => target.Eval("2()"));
        }
 
        [Test]
        public void Not_valid_expression()
        {
            var target = new Interpreter();
 
            Assert.Throws<UnknownIdentifierException>(() => target.Eval("'5' + 3 /(asda"));
        }
 
        [Test]
        public void TryParse_an_invalid_expression_unknown_identifier_x()
        {
            var target = new Interpreter();
 
            var ex = Assert.Throws<UnknownIdentifierException>(() => target.Parse("x + y * Math.Pow(x, 2)", typeof(void)));
 
            Assert.That(ex.Message, Is.EqualTo("Unknown identifier 'x' (at index 0)."));
            Assert.That(ex.Identifier, Is.EqualTo("x"));
            Assert.That(ex.Position, Is.EqualTo(0));
        }
 
        [Test]
        public void Parse_an_invalid_expression_unknown_identifier_y()
        {
            var target = new Interpreter()
                                    .SetVariable("x", 10.0);
 
            var ex = Assert.Throws<UnknownIdentifierException>(() => target.Parse("x + y * Math.Pow(x, 2)", typeof(void)));
 
            Assert.That(ex.Identifier, Is.EqualTo("y"));
            Assert.That(ex.Position, Is.EqualTo(4));
        }
 
        [Test]
        public void Parse_an_invalid_expression_unknown_method()
        {
            var target = new Interpreter()
                                    .SetVariable("x", 10.0);
 
            var ex = Assert.Throws<NoApplicableMethodException>(() => target.Parse("Math.NotExistingMethod(x, 2)", typeof(void)));
 
            Assert.That(ex.MethodName, Is.EqualTo("NotExistingMethod"));
            Assert.That(ex.MethodTypeName, Is.EqualTo("Math"));
            Assert.That(ex.Position, Is.EqualTo(5));
        }
 
        [Test]
        public void SystemExceptions_are_preserved_using_delegate_variable()
        {
            var target = new Interpreter();
 
            Func<string> testException = () =>
            {
                throw new InvalidOperationException("Test");
            };
 
            target.SetVariable("testException", testException);
 
            Assert.Throws<InvalidOperationException>(() => target.Eval("testException()"));
        }
 
        [Test]
        public void CustomExceptions_WithoutSerializationConstructor_are_preserved()
        {
            var target = new Interpreter();
 
            Func<string> testException = () =>
            {
                throw new MyException("Test");
            };
 
            target.SetVariable("testException", testException);
 
            Assert.Throws<MyException>(() => target.Eval("testException()"));
        }
 
        [Test]
        public void SystemExceptions_are_preserved_using_method_invocation()
        {
            var target = new Interpreter();
            target.SetVariable("a", new MyTestService());
 
            Assert.Throws<NotImplementedException>(() => target.Eval("a.ThrowException()"));
        }
 
        public class MyException : Exception
        {
            public MyException(string message) : base(message) { }
        }
 
        // ReSharper disable once UnusedMember.Local
        private class MyTestService
        {
            // ReSharper disable once UnusedMember.Local
            public string ThrowException()
            {
                throw new NotImplementedException("AppException");
            }
        }
    }
}