/// <summary>
/// General verifier for codefixes.
/// Creates a Document from the source string, then gets diagnostics on it and applies the relevant codefixes.
/// Then gets the string after the codefix is applied and compares it with the expected result.
/// Note: If any codefix causes new diagnostics to show up, the test fails unless allowNewCompilerDiagnostics is set to true.
/// </summary>
/// <param name="analyzer">The analyzer to be applied to the source code</param>
/// <param name="codeFixProvider">The codefix to be applied to the code wherever the relevant Diagnostic is found</param>
/// <param name="oldSource">A class in the form of a string before the CodeFix was applied to it</param>
/// <param name="newSource">A class in the form of a string after the CodeFix was applied to it</param>
private void VerifyFix(TAnalyzer analyzer, TCodeFix codeFixProvider, string oldSource, string newSource)
{
var document = GetDocument();
var analyzerDiagnostics = GetSortedDiagnosticsFromDocument(analyzer, document);
var compilerDiagnostics = GetCompilerDiagnostics(document);
var attempts = analyzerDiagnostics.Length;
for (int i = 0; i < attempts; ++i)
{
var actions = new List <CodeAction>();
var context = new CodeFixContext(document, analyzerDiagnostics[0], (a, d) => actions.Add(a), CancellationToken.None);
codeFixProvider.RegisterCodeFixesAsync(context).Wait();
if (!actions.Any())
{
break;
}
document = ApplyFix(document, actions.ElementAt(0));
analyzerDiagnostics = GetSortedDiagnosticsFromDocument(analyzer, document);
//check if there are analyzer diagnostics left after the code fix
if (!analyzerDiagnostics.Any())
{
break;
}
}
//after applying all of the code fixes, compare the resulting string to the inputted one
var actual = GetStringFromDocument(document);
Assert.Equal(newSource, actual);
Document ApplyFix(Document document, CodeAction codeAction)
{
var operations = codeAction.GetOperationsAsync(CancellationToken.None).Result;
var solution = operations.OfType <ApplyChangesOperation>().Single().ChangedSolution;
return(solution.GetDocument(document.Id));
}
string GetStringFromDocument(Document document)
{
var simplifiedDoc = Simplifier.ReduceAsync(document, Simplifier.Annotation).Result;
var root = simplifiedDoc.GetSyntaxRootAsync().Result;
root = Formatter.Format(root, Formatter.Annotation, simplifiedDoc.Project.Solution.Workspace);
return(root.GetText().ToString());
}
IEnumerable <Diagnostic> GetCompilerDiagnostics(Document document)
{
return(document.GetSemanticModelAsync().Result.GetDiagnostics());
}
}
public void Run()
{
var analyzer = new TAnalyzer();
var fix = new TCodeFix();
var actualResults = GetSortedDiagnostics(analyzer);
VerifyDiagnosticResults(actualResults, analyzer, ExpectedDiagnostics.ToArray());
if (FixedCode != null)
{
VerifyFix(analyzer, fix, TestCode, FixedCode);
}
}
