Initial timing framework and test for server

pkg/analysis_server/test/timing/completion/completion_simple.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.timing.simple;
+
+import 'dart:async';
+
+import '../timing_framework.dart';
+
+/**
+ * Perform the timing test, printing the minimum time to the output.

[scheglov, 2014/10/03 16:46:14]

Not only the minimum time.

[Brian Wilkerson, 2014/10/03 17:17:37]

Done

+ */
+void main(List<String> args) {
+  SimpleTest test = new SimpleTest();
+  test.run().then((TimingResult result) {
+    print('minTime = ${result.minTime}');
+    print('averageTime = ${result.averageTime}');
+    print('maxTime = ${result.maxTime}');
+    print('standardDeviation = ${result.standardDeviation}');
+  });
+}
+
+/**
+ * A test of how long it takes to get code completion results after making a
+ * minor change inside a method body.
+ */
+class SimpleTest extends TimingTest {
+  /**
+   * The path to the file in which code completion is to be performed.
+   */
+  String mainFilePath;
+
+  /**
+   * The original content of the file.
+   */
+  String originalContent;
+
+  /**
+   * The offset of the cursor when requesting code completion.
+   */
+  int cursorOffset;
+
+  /**
+   * A completer that will be completed when code completion results have been
+   * received from the server.
+   */
+  Completer completionReceived;
+
+  /**
+   * Initialize a newly created test.
+   */
+  SimpleTest();
+
+  @override
+  Future oneTimeSetUp() {
+    return super.oneTimeSetUp().then((_) {
+      mainFilePath = sourcePath('test.dart');
+      originalContent = r'''
+class C {
+  m() {
+    return 0;
+  }
+}
+
+f(C c) {
+  return c;
+}
+''';
+      cursorOffset = originalContent.indexOf('c;') + 1;
+      writeFile(mainFilePath, originalContent);
+    });
+  }
+
+  @override
+  Future setUp() {
+    completionReceived = new Completer();
+    onCompletionResults.listen((_) {
+      // We only care about the time to the first response.
+      if (!completionReceived.isCompleted) {
+        completionReceived.complete();
+      }
+    });
+    int separatorIndex = mainFilePath.lastIndexOf('/');

[Paul Berry, 2014/10/03 16:58:35]

I think this will be wrong on Windows.  Instead use

  String mainDirectory = path.dirname(mainFilePath);

[Brian Wilkerson, 2014/10/03 17:17:37]

Done

+    String mainDirectory = mainFilePath.substring(0, separatorIndex);

[scheglov, 2014/10/03 16:46:14]

We could use package:path for this.

[Brian Wilkerson, 2014/10/03 17:17:37]

Done

+    sendAnalysisSetAnalysisRoots([mainDirectory], []);
+    sendAnalysisUpdateContent({
+      mainFilePath: {
+        'type': 'add',
+        'content': originalContent
+      }
+    });
+    return new Future.value();
+  }
+
+  @override
+  Future perform() {
+    sendAnalysisUpdateContent({
+      mainFilePath: {
+        'type': 'change',
+        'edits': [{
+            'offset': cursorOffset,
+            'length': 0,
+            'replacement': '.'
+          }]
+      }
+    });
+    sendCompletionGetSuggestions(mainFilePath, cursorOffset + 1);
+    return completionReceived.future;
+  }
+
+  @override
+  Future tearDown() {
+    sendAnalysisSetAnalysisRoots([], []);
+    return new Future.value();
+  }
+}