Add tests supporting the wildcard feature

test/dartdoc_test_base.dart

@@ -40,7 +40,7 @@ abstract class DartdocTestBase {
 
   String get sdkConstraint => '>=3.3.0 <4.0.0';
 
-  List<String> get experiments => [];
+  List<String> get experiments => ['wildcards'];
 
   bool get skipUnreachableSdkLibraries => true;
 

test/parameter_test.dart

@@ -20,8 +20,48 @@ void main() {
 class ParameterTest extends DartdocTestBase {
   @override
   String get libraryName => 'parameters';
-  @override
-  String get sdkConstraint => '>=2.17.0 <3.0.0';
+
+  void test_formalParameter_referenced() async {
+    var library = await bootPackageWithLibrary('''
+/// Text [p].
+void f(int p) {}
+''');
+    var f = library.functions.named('f');
+    // There is no link, but also no wrong link or crash.
+    expect(f.documentationAsHtml, '<p>Text <code>p</code>.</p>');
+  }
+
+  void test_formalParameter_referenced_notShadowedElement() async {
+    var library = await bootPackageWithLibrary('''
+/// Text [p].
+void f(int p) {}
+var p = 0;
+''');
+    var f = library.functions.named('f');
+    // There is no link, but also no wrong link or crash.
+    expect(f.documentationAsHtml, '<p>Text <code>p</code>.</p>');
+  }
+
+  void test_formalParameter_referenced_notShadowedPrefix() async {
+    var library = await bootPackageWithLibrary('''
+import 'dart:async' as p;
+/// Text [p].
+void f(int p) {}
+''');
+    var f = library.functions.named('f');
+    // There is no link, but also no wrong link or crash.
+    expect(f.documentationAsHtml, '<p>Text <code>p</code>.</p>');
+  }
+
+  void test_formalParameter_referenced_wildcard() async {
+    var library = await bootPackageWithLibrary('''
+/// Text [_].
+void f(int _) {}
+''');
+    var f = library.functions.named('f');
+    // There is no link, but also no wrong link or crash.
+    expect(f.documentationAsHtml, '<p>Text <code>_</code>.</p>');
+  }
 
   void test_formalParameter_generic_method() async {
     var library = await bootPackageWithLibrary('''

test/type_parameter_test.dart

@@ -0,0 +1,54 @@
+// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:test/test.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+
+import 'dartdoc_test_base.dart';
+import 'src/utils.dart';
+
+void main() {
+  defineReflectiveSuite(() {
+    defineReflectiveTests(TypeParameterTest);
+  });
+}
+
+@reflectiveTest
+class TypeParameterTest extends DartdocTestBase {
+  @override
+  String get libraryName => 'type_parameters';
+
+  void test_referenced() async {
+    var library = await bootPackageWithLibrary('''
+/// Text [T].
+void f<T>(int p) {}
+typedef T = int;
+''');
+    var f = library.functions.named('f');
+    // There is no link, but also no wrong link or crash.
+    expect(f.documentationAsHtml, '<p>Text <code>T</code>.</p>');
+  }
+
+  void test_referenced_wildcard() async {
+    var library = await bootPackageWithLibrary('''
+/// Text [_].
+void f<_>() {}
+''');
+    var f = library.functions.named('f');
+    // There is no link, but also no wrong link or crash.
+    expect(f.documentationAsHtml, '<p>Text <code>_</code>.</p>');
+  }
+
+  void test_referenced_wildcardInParent() async {
+    var library = await bootPackageWithLibrary('''
+class C<_> {
+  /// Text [_].
+  void m() {}
+}
+''');
+    var m = library.classes.named('C').instanceMethods.named('m');
+    // There is no link, but also no wrong link or crash.
+    expect(m.documentationAsHtml, '<p>Text <code>_</code>.</p>');
+  }
+}