private static void VerifyFix(Solution sln, IReadOnlyList <ImmutableArray <Diagnostic> > diagnostics, DiagnosticAnalyzer analyzer, CodeFixProvider fix, string fixedCode, string fixTitle = null, AllowCompilationErrors allowCompilationErrors = AllowCompilationErrors.No)
{
var fixableDiagnostics = diagnostics.SelectMany(x => x)
.Where(x => fix.FixableDiagnosticIds.Contains(x.Id))
.ToArray();
if (fixableDiagnostics.Length == 0)
{
var message = $"Code analyzed with {analyzer} did not generate any diagnostics fixable by {fix}.{Environment.NewLine}" +
$"The analyzed code contained the following diagnostics: {{{string.Join(", ", diagnostics.SelectMany(x => x).Select(d => d.Id))}}}{Environment.NewLine}" +
$"The code fix supports the following diagnostics: {{{string.Join(", ", fix.FixableDiagnosticIds)}}}";
throw new AssertException(message);
}
if (fixableDiagnostics.Length > 1)
{
var message = $"Code analyzed with {analyzer} generated more than one diagnostic fixable by {fix}.{Environment.NewLine}" +
$"The analyzed code contained the following diagnostics: {{{string.Join(", ", diagnostics.SelectMany(x => x).Select(d => d.Id))}}}{Environment.NewLine}" +
$"The code fix supports the following diagnostics: {{{string.Join(", ", fix.FixableDiagnosticIds)}}}{Environment.NewLine}" +
$"Maybe you meant to call AnalyzerAssert.FixAll?";
throw new AssertException(message);
}
var diagnostic = fixableDiagnostics.Single();
var fixedSolution = Fix.Apply(sln, fix, diagnostic, fixTitle);
if (ReferenceEquals(sln, fixedSolution))
{
throw new AssertException($"{fix} did not change any document.");
}
var fixedSource = CodeReader.GetStringFromDocument(
fixedSolution.GetDocument(sln.GetDocument(diagnostic.Location.SourceTree).Id),
Formatter.Annotation,
CancellationToken.None);
CodeAssert.AreEqual(fixedCode, fixedSource);
if (allowCompilationErrors == AllowCompilationErrors.No)
{
VerifyNoCompilerErrorsAsync(fix, fixedSolution).GetAwaiter().GetResult();
}
}