Fix hover documentation for parameters.

pkg/analysis_server/test/analysis/get_hover_test.dart

Index: pkg/analysis_server/test/analysis/get_hover_test.dart
diff --git a/pkg/analysis_server/test/analysis/get_hover_test.dart b/pkg/analysis_server/test/analysis/get_hover_test.dart
index bda7c915f1b7f008975039b05d5c5fa9307ebc01..61520dc76f2a531537bcd2ba852c6846096c9177 100644
--- a/pkg/analysis_server/test/analysis/get_hover_test.dart
+++ b/pkg/analysis_server/test/analysis/get_hover_test.dart
@@ -168,6 +168,31 @@ main(A a) {
     });
   }
 
+  test_expression_parameter() {
+    addTestFile('''
+library my.library;
+class A {
+  /// The method documentation.
+  m(int p) {
+  }
+}
+''');
+    return prepareHover('p) {').then((HoverInformation hover) {
+      // element
+      expect(hover.containingLibraryName, isNull);
+      expect(hover.containingLibraryPath, isNull);
+      expect(hover.containingClassDescription, isNull);
+      expect(hover.dartdoc, 'The method documentation.');
+      expect(hover.elementDescription, 'int p');
+      expect(hover.elementKind, 'parameter');
+      // types
+      expect(hover.staticType, 'int');
+      expect(hover.propagatedType, isNull);
+      // no parameter
+      expect(hover.parameter, isNull);
+    });
+  }
+
   test_expression_syntheticGetter() {
     addTestFile('''
 library my.library;