improve completions in closures and switch statements

pkg/analysis_server/test/services/completion/dart/keyword_contributor_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.dart.keyword;
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/provisional/completion/dart/completion_dart.dart';
 import 'package:analysis_server/src/services/completion/dart/keyword_contributor.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 353 matching lines @@
         pseudoKeywords: ['async'], relevance: DART_RELEVANCE_HIGH);
   }
 
   test_anonymous_function_async5() async {
     addTestSource('main() {foo(() ^}}');
     await computeSuggestions();
     assertSuggestKeywords(EXPRESSION_START_NO_INSTANCE,
         pseudoKeywords: ['async', 'async*', 'sync*']);
   }
 
+  test_anonymous_function_async6() async {
+    addTestSource('main() {foo("bar", () as^{}}');
+    await computeSuggestions();
+    assertSuggestKeywords([],
+        pseudoKeywords: ['async', 'async*', 'sync*'],
+        relevance: DART_RELEVANCE_HIGH);
+  }
+
+  test_anonymous_function_async7() async {
+    addTestSource('main() {foo("bar", () as^ => null');
+    await computeSuggestions();
+    assertSuggestKeywords([],
+        pseudoKeywords: ['async', 'async*', 'sync*'],
+        relevance: DART_RELEVANCE_HIGH);
+  }
+
   test_argument() async {
     addTestSource('main() {foo(^);}');
     await computeSuggestions();
     assertSuggestKeywords(EXPRESSION_START_NO_INSTANCE);
   }
 
   test_argument2() async {
     addTestSource('main() {foo(n^);}');
     await computeSuggestions();
     assertSuggestKeywords(EXPRESSION_START_NO_INSTANCE);
@@ skipping 788 matching lines @@
     assertSuggestKeywords(DIRECTIVE_AND_DECLARATION_KEYWORDS,
         relevance: DART_RELEVANCE_HIGH);
   }
 
   test_is_expression() async {
     addTestSource('main() {if (x is^)}');
     await computeSuggestions();
     assertSuggestKeywords([Keyword.IS], relevance: DART_RELEVANCE_HIGH);
   }
 
+  test_is_expression_partial() async {
+    addTestSource('main() {if (x i^)}');
+    await computeSuggestions();
+    assertSuggestKeywords([Keyword.IS], relevance: DART_RELEVANCE_HIGH);
+  }
+
   test_library() async {
     addTestSource('library foo;^');
     await computeSuggestions();
     assertSuggestKeywords(DIRECTIVE_AND_DECLARATION_KEYWORDS,
         relevance: DART_RELEVANCE_HIGH);
   }
 
   test_library_declaration() async {
     addTestSource('library ^');
     await computeSuggestions();
@@ skipping 141 matching lines @@
     await computeSuggestions();
     assertSuggestKeywords(EXPRESSION_START_INSTANCE);
   }
 
   test_method_body_return() async {
     addTestSource('class A { foo() {return ^}}');
     await computeSuggestions();
     assertSuggestKeywords(EXPRESSION_START_INSTANCE);
   }
 
+  test_method_invocation() async {
+    addTestSource('class A { foo() {bar.^}}');
+    await computeSuggestions();
+    assertNoSuggestions();
+  }
+
+  test_method_invocation2() async {
+    addTestSource('class A { foo() {bar.as^}}');
+    await computeSuggestions();
+    assertNoSuggestions();
+  }
+
   test_method_param() async {
     addTestSource('class A { foo(^) {});}');
     await computeSuggestions();
     expect(suggestions, isEmpty);
   }
 
   test_method_param2() async {
     addTestSource('class A { foo(t^) {});}');
     await computeSuggestions();
     expect(suggestions, isEmpty);
@@ skipping 193 matching lines @@
         (c) => msg.writeln('  $c, ${other.contains(c) ? '' : '<<<<<<<<<<<'}'));
   }
 
   bool _equalSets(Iterable<String> iter1, Iterable<String> iter2) {
     if (iter1.length != iter2.length) return false;
     if (iter1.any((c) => !iter2.contains(c))) return false;
     if (iter2.any((c) => !iter1.contains(c))) return false;
     return true;
   }
 }