Postfix completion

pkg/analysis_server/test/edit/postfix_completion_test.dart

+// Copyright (c) 2017, 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.
+
+import 'package:analysis_server/protocol/protocol.dart';
+import 'package:analysis_server/protocol/protocol_generated.dart';
+import 'package:analysis_server/src/edit/edit_domain.dart';
+import 'package:analyzer_plugin/protocol/protocol_common.dart';
+import 'package:plugin/manager.dart';
+import 'package:test/test.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+
+import '../analysis_abstract.dart';
+
+main() {
+  defineReflectiveSuite(() {
+    defineReflectiveTests(PostfixCompletionTest);
+  });
+}
+
+@reflectiveTest
+class PostfixCompletionTest extends AbstractAnalysisTest {
+  SourceChange change;
+
+  @override
+  void setUp() {
+    super.setUp();
+    createProject();
+    ExtensionManager manager = new ExtensionManager();
+    manager.processPlugins([server.serverPlugin]);
+    handler = new EditDomainHandler(server);
+  }
+
+  test_for() async {
+    addTestFile('''
+main() {
+  [].for
+}
+''');
+    await waitForTasksFinished();
+    await _prepareCompletion('.for', atStart: true);
+    _assertHasChange(
+        'Expand .for',
+        '''
+main() {
+  for (var value in []) {
+    /*caret*/
+  }
+}
+''');
+  }
+
+  void _assertHasChange(String message, String expectedCode, [Function cmp]) {
+    if (change.message == message) {
+      if (!change.edits.isEmpty) {
+        String resultCode =
+            SourceEdit.applySequence(testCode, change.edits[0].edits);
+        expect(resultCode, expectedCode.replaceAll('/*caret*/', ''));
+        if (cmp != null) {
+          int offset = cmp(resultCode);
+          expect(change.selection.offset, offset);
+        }
+      } else {
+        if (cmp != null) {
+          int offset = cmp(testCode);
+          expect(change.selection.offset, offset);
+        }
+      }
+      return;
+    }
+    fail("Expected to find |$message| but got: " + change.message);
+  }
+
+  _prepareCompletion(String key,
+      {bool atStart: false, bool atEnd: false, int delta: 0}) async {
+    int offset = findOffset(key);
+    String src = testCode.replaceFirst(key, '', offset);
+    modifyTestFile(src);
+    await _prepareCompletionAt(offset, key);
+  }
+
+  _prepareCompletionAt(int offset, String key) async {
+    var params = new EditGetPostfixCompletionParams(testFile, key, offset);
+    var request =
+        new Request('0', "edit.isPostfixCompletionApplicable", params.toJson());
+    Response response = await waitResponse(request);
+    var isApplicable =
+        new EditIsPostfixCompletionApplicableResult.fromResponse(response);
+    if (!isApplicable.value) {
+      fail("Postfix completion not applicable at given location");
+    }
+    request = new EditGetPostfixCompletionParams(testFile, key, offset)
+        .toRequest('1');
+    response = await waitResponse(request);
+    var result = new EditGetPostfixCompletionResult.fromResponse(response);
+    change = result.change;
+  }
+}