APISampleUnitTestsCS.Compilations.GetErrorsAndWarnings C# (CSharp) Метод

        public void GetErrorsAndWarnings()
        {
            string text = @"class Program
            {
            static int Main(string[] args)
            {
            }
            }";

            SyntaxTree tree = SyntaxTree.ParseText(text);
            Compilation compilation = Compilation
                .Create("program.exe")
                .AddSyntaxTrees(tree)
                .AddReferences(new MetadataFileReference(typeof(object).Assembly.Location));

            IEnumerable<Diagnostic> errorsAndWarnings = compilation.GetDiagnostics();
            Assert.AreEqual(1, errorsAndWarnings.Count());

            Diagnostic error = errorsAndWarnings.First();
            Assert.AreEqual(
                "'Program.Main(string[])': not all code paths return a value",
                error.Info.GetMessage(CultureInfo.InvariantCulture));

            Location errorLocation = error.Location;
            Assert.AreEqual(4, error.Location.SourceSpan.Length);

            IText programText = errorLocation.SourceTree.GetText();
            Assert.AreEqual("Main", programText.ToString(errorLocation.SourceSpan));

            FileLinePositionSpan span = error.Location.GetLineSpan(usePreprocessorDirectives: true);
            Assert.AreEqual(15, span.StartLinePosition.Character);
            Assert.AreEqual(2, span.StartLinePosition.Line);
        }