incremental step moving completion into services and adding tests

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/completion/top_level_computer.dart';
+import 'package:analysis_services/index/index.dart';
+import 'package:analysis_services/index/local_memory_index.dart';
+import 'package:analysis_services/src/search/search_engine.dart';
+import 'package:analysis_testing/abstract_single_unit.dart';
+import 'package:analysis_testing/reflective_tests.dart';
+import 'package:unittest/unittest.dart';
+import 'dart:async';
+
+main() {
+  groupSep = ' | ';
+  runReflectiveTests(TopLevelComputerTest);
+}
+
+@ReflectiveTestCase()
+class TopLevelComputerTest extends AbstractSingleUnitTest {
+  Index index;
+  SearchEngineImpl searchEngine;
+  TopLevelComputer computer;
+  List<CompletionSuggestion> suggestions;
+
+  test_class() {
+    addTestUnit('class B {boolean v;}');
+    return compute().then((_) {
+      assertHasResult(CompletionSuggestionKind.CLASS, 'B');
+      assertNoResult('v');
+    });
+  }
+
+  void addTestUnit(String code) {
+    resolveTestUnit(code);
+    index.indexUnit(context, testUnit);
+  }
+
+  void assertHasResult(CompletionSuggestionKind kind, String completion,
+      [CompletionRelevance relevance = CompletionRelevance.DEFAULT,
+      bool isDeprecated = false, bool isPotential = false]) {
+    var cs = suggestions.firstWhere((cs) => cs.completion == completion, orElse: () {
+      var completions = suggestions.map((s) => s.completion).toList();
+      fail('expected "$completion" but found\n $completions');
+    });
+    expect(cs.kind, equals(kind));
+    expect(cs.relevance, equals(relevance));
+    expect(cs.selectionOffset, equals(completion.length));
+    expect(cs.selectionLength, equals(0));
+    expect(cs.isDeprecated, equals(isDeprecated));
+    expect(cs.isPotential, equals(isPotential));
+  }
+
+  void assertNoResult(String completion) {
+    if (suggestions.any((cs) => cs.completion == completion)) {
+      fail('did not expect completion: $completion');
+    }
+  }
+
+  Future compute() {
+    return computer.compute().then((List<CompletionSuggestion> results) {
+      this.suggestions = results;
+    });
+  }
+
+  @override
+  void setUp() {
+    super.setUp();
+    index = createLocalMemoryIndex();
+    searchEngine = new SearchEngineImpl(index);
+    computer = new TopLevelComputer(searchEngine);
+    verifyNoTestUnitErrors = false;
+  }
+}