[DAS] Tests for parameter highlights

[email protected]

Bug: #60046
Change-Id: I5b57109e9459a8583fd543031f239174a71472cf
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/408040
Reviewed-by: Konstantin Shcheglov <[email protected]>
Commit-Queue: Samuel Rawlins <[email protected]>
Auto-Submit: Felipe Morschel <[email protected]>
Reviewed-by: Samuel Rawlins <[email protected]>

Author: FMorschel

pkg/analysis_server/test/lsp/document_highlights_test.dart

@@ -72,6 +72,28 @@ void f() {
     /*[1*/x/*1]*/;
   }
 }
+''');
+
+  Future<void> test_formalParameters_closure() => _testMarkedContent('''
+void f(void Function(int) _) {}
+
+void g() => f((/*[0*/^variable/*0]*/) {
+  print(/*[1*/variable/*1]*/);
+});
+''');
+
+  Future<void> test_formalParameters_function() => _testMarkedContent('''
+void f(int /*[0*/^parameter/*0]*/) {
+  print(/*[1*/parameter/*1]*/);
+}
+''');
+
+  Future<void> test_formalParameters_method() => _testMarkedContent('''
+class C {
+  void m(int /*[0*/^parameter/*0]*/) {
+    print(/*[1*/parameter/*1]*/);
+  }
+}
 ''');
 
   Future<void> test_functions() => _testMarkedContent('''