AjErl.Tests.Forms.MultiFunctionFormTests.RaiseIfArityIsWrong C# (CSharp) Method

        public void RaiseIfArityIsWrong()
        {
            Context context = new Context();
            FunctionForm form1 = this.MakeForm("f(0) -> 1.");
            FunctionForm form2 = this.MakeForm("f(1) -> 1.");
            FunctionForm form3 = this.MakeForm("f(X, Y) -> f(X-1) + f(X-2).");
            MultiFunctionForm mform = new MultiFunctionForm(new FunctionForm[] { form1, form2, form3 });

            try
            {
                mform.Evaluate(context);
                Assert.Fail();
            }
            catch (Exception ex)
            {
                Assert.AreEqual("head mismatch", ex.Message);
            }
        }