Fix a failing test (TBR)

pkg/analyzer_cli/test/options_test.dart

Index: pkg/analyzer_cli/test/options_test.dart
diff --git a/pkg/analyzer_cli/test/options_test.dart b/pkg/analyzer_cli/test/options_test.dart
index 278aac9cecf564801f997ecd30068c28ea7d97e1..3ca3af398880447f4c72b291c3574984478ea2a6 100644
--- a/pkg/analyzer_cli/test/options_test.dart
+++ b/pkg/analyzer_cli/test/options_test.dart
@@ -35,7 +35,7 @@ main() {
         expect(options.enableStrictCallChecks, isFalse);
         expect(options.enableSuperMixins, isFalse);
         expect(options.enableTypeChecks, isFalse);
-        expect(options.enableAssertInitializer, isFalse);
+        expect(options.enableAssertInitializer, isNull);
         expect(options.hintsAreFatal, isFalse);
         expect(options.ignoreUnrecognizedFlags, isFalse);
         expect(options.log, isFalse);