/// <summary>
/// General method that gets a collection of actual diagnostics found in the source after the analyzer is run, then verifies each of them.
/// </summary>
/// <param name="sources">
/// An array of strings to create source documents from to run the analyzers on.
/// </param>
/// <param name="language">
/// The language of the classes represented by the source strings.
/// </param>
/// <param name="analyzer">
/// The analyzer to be run on the source code.
/// </param>
/// <param name="expected">
/// DiagnosticResults that should appear after the analyzer is run on the sources.</param>
private void VerifyDiagnostics(string[] sources, string language, DiagnosticAnalyzer analyzer, params DiagnosticResult[] expected)
{
var diagnostics = DiagnosticVerifier.GetSortedDiagnostics(sources, language, analyzer);
VerifyDiagnosticResults(diagnostics, analyzer, expected);
}