rename and improve imported completion computer

pkg/analysis_services/test/completion/top_level_computer_test.dart

-// Copyright (c) 2014, 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.
-
-library test.services.completion.toplevel;
-
-import 'package:analysis_services/completion/completion_suggestion.dart';
-import 'package:analysis_services/src/completion/top_level_computer.dart';
-import 'package:analysis_testing/reflective_tests.dart';
-import 'package:unittest/unittest.dart';
-
-import 'completion_test_util.dart';
-
-main() {
-  groupSep = ' | ';
-  runReflectiveTests(TopLevelComputerTest);
-}
-
-@ReflectiveTestCase()
-class TopLevelComputerTest extends AbstractCompletionTest {
-
-  @override
-  void setUp() {
-    super.setUp();
-    computer = new TopLevelComputer();
-  }
-
-  test_class() {
-    addSource('/testA.dart', 'class A {int x;} class _B { }');
-    addTestSource('import "/testA.dart"; class C {foo(){^}}');
-    return computeFull().then((_) {
-      assertSuggestClass('A');
-      assertNotSuggested('x');
-      assertNotSuggested('_B');
-    });
-  }
-
-  test_class_notImported() {
-    addSource('/testA.dart', 'class A {int x;} class _B { }');
-    addTestSource('class C {foo(){^}}');
-    return computeFull().then((_) {
-      assertSuggestClass('A', CompletionRelevance.LOW);
-      assertNotSuggested('x');
-      assertNotSuggested('_B');
-    });
-  }
-
-  test_dartCore() {
-    addTestSource('class C {foo(){^}}');
-    return computeFull().then((_) {
-      assertSuggestClass('Object');
-      assertNotSuggested('HtmlElement');
-    });
-  }
-
-  test_dartHtml() {
-    addTestSource('import "dart:html"; class C {foo(){^}}');
-    return computeFull().then((_) {
-      assertSuggestClass('Object');
-      assertSuggestClass('HtmlElement');
-    });
-  }
-
-  test_topLevelVar() {
-    addSource('/testA.dart', 'var T1; var _T2;');
-    addTestSource('import "/testA.dart"; class C {foo(){^}}');
-    return computeFull().then((_) {
-      assertSuggestTopLevelVar('T1');
-      assertNotSuggested('_T2');
-    });
-  }
-
-  test_topLevelVar_notImported() {
-    addSource('/testA.dart', 'var T1; var _T2;');
-    addTestSource('class C {foo(){^}}');
-    return computeFull().then((_) {
-      assertSuggestTopLevelVar('T1', CompletionRelevance.LOW);
-      assertNotSuggested('_T2');
-    });
-  }
-}