Arithmetica.Tests.MathExpressionContextTests.MathExpressionContext_Cannot_Define_Variable_That_Implicitly_Refers_To_Itself C# (CSharp) Метод

        public void MathExpressionContext_Cannot_Define_Variable_That_Implicitly_Refers_To_Itself()
        {
            MathExpressionContext context = new MathExpressionContext();
            context.Define("x", 5);
            context.Define("y", MathExpression.Parse("5x"));
            var exception = Assert.Throws<MathExpressionException>(() => context.Define("x", MathExpression.Parse("y")));
            Assert.AreEqual("Variable 'x' is refering to itself recursively.", exception.Message);
        }