AjErl.Tests.Compiler.ParserTests.ParseSimpleSubtract C# (CSharp) Метод

        public void ParseSimpleSubtract()
        {
            Parser parser = new Parser("10-20.");

            IExpression expression = parser.ParseExpression();

            Assert.IsNotNull(expression);
            Assert.IsInstanceOfType(expression, typeof(SubtractExpression));

            SubtractExpression subtractexpression = (SubtractExpression)expression;

            Assert.IsInstanceOfType(subtractexpression.LeftExpression, typeof(ConstantExpression));
            Assert.IsInstanceOfType(subtractexpression.RightExpression, typeof(ConstantExpression));

            Assert.AreEqual(10, ((ConstantExpression)subtractexpression.LeftExpression).Value);
            Assert.AreEqual(20, ((ConstantExpression)subtractexpression.RightExpression).Value);
        }