used lookupInScope(name) to find the qualified names in comments.

pkg/docgen/test/single_library_test.dart

Index: pkg/docgen/test/single_library_test.dart
diff --git a/pkg/docgen/test/single_library_test.dart b/pkg/docgen/test/single_library_test.dart
index 5edaa3d2cb686c7a4fe0715fcfcf2ce09acdd663..e92c8571ac47bdef85076dd3356732d6cdab7f71 100644
--- a/pkg/docgen/test/single_library_test.dart
+++ b/pkg/docgen/test/single_library_test.dart
@@ -18,7 +18,7 @@ main() {
       file.writeAsStringSync('''
   library test;
   /**
-   * Doc comment for class A.
+   * Doc comment for class [A].
    * 
    * Multiline Test
    */
@@ -27,17 +27,17 @@ main() {
    */
   class A {
     
-    /**
-     * Markdown _test_ for **class** [A] 
-     */
     int _someNumber;
     
     A() {
       _someNumber = 12;
     }
     
-    void doThis(int a) {
-      print(a);
+    /**
+     * Test for linking to parameter [A]
+     */
+    void doThis(int A) {
+      print(A);
     }
   }
   
@@ -79,6 +79,30 @@ main() {
           var variables = library.variables.values;
           expect(variables.every((e) => e is Variable), isTrue);
           
+          /// Testing fixReference 
+          // Testing Doc comment for class [A].
+          var libraryMirror = mirrorSystem.libraries[testLibraryUri];
+          var classMirror = libraryMirror.classes.values.first;
+          var classDocComment = fixReference('A', libraryMirror, 
+              classMirror, null).children.first.text;
+          expect(classDocComment == 'test.A', isTrue);
+          
+          // Test for linking to parameter [A]
+          var methodMirror = classMirror.methods['doThis'];
+          var methodParameterDocComment = fixReference('A', libraryMirror,
+              classMirror, methodMirror).children.first.text;
+          expect(methodParameterDocComment == 'test.A.doThis#A', isTrue);
+          
+          // Testing trying to refer to doThis function
+          var methodDocComment = fixReference('doThis', libraryMirror, 
+              classMirror, methodMirror).children.first.text;
+          expect(methodDocComment == 'test.A.doThis', isTrue);
+          
+          // Testing something with no reference
+          var libraryDocComment = fixReference('foobar', libraryMirror,
+              classMirror, methodMirror).children.first.text;
+          expect(libraryDocComment == 'foobar', isTrue);
+          
           file.deleteSync();
         }));
     });