Instrument analyzer's type analysis and run front_end inference tests.

pkg/analyzer/test/src/task/strong/front_end_inference_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 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:analyzer/src/generated/source.dart';
+import 'package:front_end/src/base/instrumentation.dart' as fasta;
+import 'package:front_end/src/fasta/compiler_context.dart' as fasta;
+import 'package:front_end/src/fasta/testing/validating_instrumentation.dart'
+    as fasta;
+import 'package:kernel/kernel.dart' as fasta;
+import 'package:path/path.dart' as pathos;
+import 'package:test/test.dart';
+
+import '../../dart/analysis/base.dart';
+
+Future<Null> main() async {
+  await _runFrontEndInferenceTests();
+}
+
+/**
+ * Expects that the [Platform.script] is a test inside of `pkg/analyzer/test`
+ * folder, and return the absolute path of the `pkg` folder.
+ */
+String _findPkgRoot() {
+  String scriptPath = pathos.fromUri(Platform.script);
+  List<String> parts = pathos.split(scriptPath);
+  for (int i = 0; i < parts.length - 2; i++) {
+    if (parts[i] == 'pkg' &&
+        parts[i + 1] == 'analyzer' &&
+        parts[i + 2] == 'test') {
+      return pathos.joinAll(parts.sublist(0, i + 1));
+    }
+  }
+  throw new StateError('Unable to find sdk/pkg/ in $scriptPath');
+}
+
+Future<Null> _runFrontEndInferenceTests() async {
+  String pkgPath = _findPkgRoot();
+  String fePath = pathos.join(pkgPath, 'front_end', 'testcases', 'inference');
+  List<File> dartFiles = new Directory(fePath)
+      .listSync()
+      .where((entry) => entry is File && entry.path.endsWith('.dart'))
+      .map((entry) => entry as File)
+      .toList();
+
+  for (File file in dartFiles) {
+    var test = new _FrontEndInferenceTest();
+    await test.setUp();
+    try {
+      String code = file.readAsStringSync();
+      await test.runTest(file.path, code);
+    } catch (_) {
+      print(_);
+    } finally {
+      await test.tearDown();
+    }
+  }
+}
+
+class _FrontEndInferenceTest extends BaseAnalysisDriverTest {
+  Future<Null> runTest(String path, String code) async {
+    var uri = provider.pathContext.toUri(path);
+
+    List<int> lineStarts = new LineInfo.fromContent(code).lineStarts;
+    fasta.CompilerContext.current.uriToSource[uri.toString()] =
+        new fasta.Source(lineStarts, UTF8.encode(code));
+
+    var validation = new fasta.ValidatingInstrumentation();
+    await validation.loadExpectations(uri);
+
+    driver.test.instrumentation = new _Instrumentation(validation);
+    provider.newFile(path, code);
+    await driver.getResult(path);
+
+    validation.finish();
+
+    if (validation.hasProblems) {
+      var problem = validation.problemsAsString;
+      fail(problem);
+    }
+  }
+}
+
+class _Instrumentation implements fasta.Instrumentation {
+  final fasta.Instrumentation instrumentation;
+  final Set<String> _seenKeys = new Set<String>();
+
+  _Instrumentation(this.instrumentation);
+
+  @override
+  void record(
+      Uri uri, int offset, String property, fasta.InstrumentationValue value) {
+    // Analyzer's resolver reports many of instance creations twice.
+    if (_seenKeys.add('$uri:$offset:$property')) {
+      instrumentation.record(uri, offset, property, value);
+    }
+  }
+}