anchor.diff:      //
       // Validate that the generator has been run.
       //
  -    if (pathContext.style != Style.windows) {
  -      String actualContent = PhysicalResourceProvider.INSTANCE
  -          .getFile(computeOutputPath())
  -          .readAsStringSync();
  -
  -      StringBuffer sink = StringBuffer();
  -      DocumentationGenerator generator = DocumentationGenerator();
  -      generator.writeDocumentation(sink);
  -      String expectedContent = sink.toString();
  -
  -      if (actualContent != expectedContent) {
  -        fail('The diagnostic documentation needs to be regenerated.\n'
  -            'Please run tool/diagnostics/generate.dart.');
  -      }
  +    String actualContent = PhysicalResourceProvider.INSTANCE
  +        .getFile(computeOutputPath())
  +        .readAsStringSync();
  +    // Normalize Windows line endings to Unix line endings so that the
  +    // comparison doesn't fail on Windows.
  +    actualContent = actualContent.replaceAll('\r\n', '\n');
  +
  +    StringBuffer sink = StringBuffer();
  +    DocumentationGenerator generator = DocumentationGenerator();
  +    generator.writeDocumentation(sink);
  +    String expectedContent = sink.toString();
  +
  +    if (actualContent != expectedContent) {
  +      fail('The diagnostic documentation needs to be regenerated.\n'
  +          'Please run tool/diagnostics/generate.dart.');
       }
     }
   
  
positive.code: 
  import 'package:analyzer/error/error.dart';
  import 'package:analyzer/file_system/physical_file_system.dart';
  import 'package:path/path.dart';
  import 'package:test/test.dart';
  import 'package:test_reflective_loader/test_reflective_loader.dart';
  
  
negative.code: class VerifyDiagnosticsTest {
    @TestTimeout(Timeout.factor(4))
    test_diagnostics() async {
      //
      // Validate that the input to the generator is correct.
      //
  